Run integration tests and improve transformers for all integrations (#32)

Reviewed-on: #32
Co-authored-by: André Menrath <andre.menrath@posteo.de>
Co-committed-by: André Menrath <andre.menrath@posteo.de>

.forgejo/workflows/phpcs.yml

@@ -46,5 +46,5 @@ jobs:
         if: steps.cache-composer.outputs.cache-hit != 'true'
         uses: ramsey/composer-install@v3
 
-      - name: Detect coding standard violations
+      - name: Run PHP_CodeSniffer
         run: ./vendor/bin/phpcs

.forgejo/workflows/phpunit.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - main
+      - improve_tests
   pull_request:
 
 env:
@@ -36,7 +37,7 @@ jobs:
           path: |
             ${{ env.WP_CORE_DIR }}
             ${{ env.WP_TESTS_DIR }}
-          key: cache-wordpress-1
+          key: cache-wordpress-4
 
       - name: Cache Composer
         id: cache-composer-phpunit
@@ -73,7 +74,22 @@ jobs:
         if: steps.cache-wordpress.outputs.cache-hit != 'false'
         run: bash bin/install-wp-tests.sh wordpress_test root root 127.0.0.1 6.6 false true true true
 
-      - name: Unit Testing
+      - name: Run Integration tests for The Events Calendar
-        run: cd /workspace/Event-Federation/wordpress-activitypub-event-extensions/ && ./vendor/bin/phpunit
+        run: cd /workspace/Event-Federation/wordpress-activitypub-event-extensions/ && ./vendor/bin/phpunit --filter=the_events_calendar
+        env:
+          PHP_VERSION: ${{ matrix.php-version }}
+
+      - name: Run Integration tests for VS Event List
+        run: cd /workspace/Event-Federation/wordpress-activitypub-event-extensions/ && ./vendor/bin/phpunit --filter=vs_event_list
+        env:
+          PHP_VERSION: ${{ matrix.php-version }}
+
+      - name: Run Integration tests for GatherPress
+        run: cd /workspace/Event-Federation/wordpress-activitypub-event-extensions/ && ./vendor/bin/phpunit --filter=gatherpress
+        env:
+          PHP_VERSION: ${{ matrix.php-version }}
+
+      - name: Run Integration tests for Events Manager
+        run: cd /workspace/Event-Federation/wordpress-activitypub-event-extensions/ && ./vendor/bin/phpunit --filter=events_manager
         env:
           PHP_VERSION: ${{ matrix.php-version }}

.gitignore

@@ -1,2 +1,3 @@
 vendor
 composer.lock
+.phpunit.result.cache

Dockerfile

@@ -11,6 +11,17 @@ RUN apk update \
 
 RUN docker-php-ext-install mysqli
 
+# Install Xdebug
+RUN apk add --no-cache $PHPIZE_DEPS \
+    && apk add --update linux-headers \
+    && pecl install xdebug \
+    && docker-php-ext-enable xdebug \
+    && apk del --purge $PHPIZE_DEPS \
+    && echo "xdebug.start_with_request=yes" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
+    && echo "xdebug.client_host=host.docker.internal" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
+    && echo "xdebug.mode=debug" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
+    && echo "xdebug.idekey=VSCODE" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
 # Install Composer
 RUN EXPECTED_CHECKSUM=$(curl -s https://composer.github.io/installer.sig) \
     && curl https://getcomposer.org/installer -o composer-setup.php \
@@ -24,4 +35,9 @@ RUN curl -O https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli
     chmod +x wp-cli.phar && \
     mv wp-cli.phar /usr/local/bin/wp
 
+COPY composer.json composer.lock /app/
+RUN composer install --no-scripts --no-autoloader
+RUN composer global require yoast/phpunit-polyfills:"^3.0" --dev
+ENV PATH="/root/.composer/vendor/bin:${PATH}"
+
 RUN chmod +x -R ./

bin/install-wp-tests.sh

@@ -15,6 +15,16 @@ SKIP_WP_INSTALL=${7-false}
 SKIP_PLUGINS_INSTALL=${8-false}
 SKIP_TEST_SUITE_INSTALL=${9-false}
 
+# Initialize the plugin list
+PLUGINS=""
+
+# Parse optional --plugins argument
+while [[ "$#" -gt 0 ]]; do
+    case $1 in
+        --plugins) PLUGINS="$2"; shift ;;
+    esac
+    shift
+done
 
 TMPDIR=${TMPDIR-/tmp}
 TMPDIR=$(echo $TMPDIR | sed -e "s/\/$//")
@@ -182,20 +192,52 @@ install_db() {
 	if [ $(mysql --user="$DB_USER" --password="$DB_PASS"$EXTRA --execute='show databases;' | grep ^$DB_NAME$) ]
 	then
 		echo "Reinstalling will delete the existing test database ($DB_NAME)"
-		read -p 'Are you sure you want to proceed? [y/N]: ' DELETE_EXISTING_DB
+		recreate_db yes
-		recreate_db $DELETE_EXISTING_DB
 	else
 		create_db
 	fi
 }
 
+install_wp_plugin() {
+    PLUGIN_NAME=$1
+
+	mkdir -p "$WP_CORE_DIR/wp-content/plugins/"
+
+	if [ -d "$WP_CORE_DIR/wp-content/plugins/$PLUGIN_NAME" ]; then
+		return;
+	fi
+
+	# Get the latest tag.
+    LATEST_TAG=$(svn log https://plugins.svn.wordpress.org/$PLUGIN_NAME/tags --limit 1 | awk 'NR == 4 { print $4 }')
+	if [ -n "$LATEST_TAG" ]; then
+		PLUGIN_FILE="$PLUGIN_NAME.$LATEST_TAG.zip"
+	else
+		PLUGIN_FILE="$PLUGIN_NAME.zip"
+	fi
+
+	URL="https://downloads.wordpress.org/plugin/$PLUGIN_FILE"
+
+    # Check if the plugin file already exists
+    if ! test -f "$TMPDIR/$PLUGIN_FILE"; then
+        download $URL "$TMPDIR/$PLUGIN_FILE"
+    fi
+
+    # Unzip the plugin into the WordPress must-use plugins directory
+    unzip -q -o "$TMPDIR/$PLUGIN_FILE" -d "$WP_CORE_DIR/wp-content/plugins/"
+}
+
 install_wp_plugins() {
 	if [ "$SKIP_PLUGINS_INSTALL" = "true" ]; then
         echo "Skipping WordPress plugin installation."
         return 0
     fi
-    download https://downloads.wordpress.org/plugin/activitypub.3.2.5.zip $TMPDIR/activitypub.zip
+	# Install the one and only ActivityPub plugin (greetings @pfefferle).
-	unzip $TMPDIR/activitypub.zip -d $WP_CORE_DIR/wp-content/plugins/
+	install_wp_plugin activitypub
+	# Install (not-activate) all supported event plugins.
+	install_wp_plugin the-events-calendar
+	install_wp_plugin very-simple-event-list
+	install_wp_plugin gatherpress
+	install_wp_plugin events-manager
 }
 
 install_wp

composer.json

@@ -3,16 +3,20 @@
     "description": "The ActivityPub Event Extensions help for event custom post types to federate properly.",
     "type": "wordpress-plugin",
     "require": {
-        "php": ">=5.6.0",
+        "php": ">=8.1.0",
-        "composer/installers": "^1.0 || ^2.0"
+        "composer/installers": "^2.0"
     },
     "require-dev": {
+        "phpunit/phpunit": "^5.7.21 || ^6.5 || ^7.5 || ^8",
         "phpcompatibility/php-compatibility": "*",
         "phpcompatibility/phpcompatibility-wp": "*",
         "squizlabs/php_codesniffer": "3.*",
-        "wp-coding-standards/wpcs": "^3.1.0",
+        "wp-coding-standards/wpcs": "dev-develop",
+        "yoast/phpunit-polyfills": "^3.0",
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0.0",
-        "sirbrillig/phpcs-variable-analysis": "^2.11"
+        "sirbrillig/phpcs-variable-analysis": "^2.11",
+        "phpcsstandards/phpcsextra": "^1.1.0",
+        "dms/phpunit-arraysubset-asserts": "^0.5.0"
     },
     "config": {
         "allow-plugins": true
@@ -36,6 +40,25 @@
         ],
         "lint:fix": [
             "vendor/bin/phpcbf"
-        ]
+        ],
+        "prepare-test": [
+            "composer install",
+            "bin/install-wp-tests.sh wordpress-test root wordpress-test test-db latest true"
+        ],
+        "test": [
+            "@prepare-test",
+            "@test-vs-event-list",
+            "@test-the-events-calendar",
+            "@test-gatherpress",
+            "@test-events-manager"
+        ],
+        "test-debug": [
+            "@prepare-test",
+            "@test-vs-event-list"
+        ],
+        "test-vs-event-list": "phpunit --filter=vs_event_list",
+        "test-the-events-calendar": "phpunit --filter=the_events_calendar",
+        "test-gatherpress": "phpunit --filter=gatherpress",
+        "test-events-manager": "phpunit --filter=events_manager"
     }
 }

docker-compose-test.yml

@@ -1,26 +0,0 @@
-version: '3'
-services:
-  test-db:
-    platform: linux/x86_64
-    image: mariadb
-    environment:
-      MYSQL_DATABASE: wordpress
-      MYSQL_ROOT_PASSWORD: wordpress
-    healthcheck:
-        test: ["CMD", "curl", "-f", "http://localhost:3306"]
-        interval: 5s
-        timeout: 2s
-        retries: 5
-
-  test-php:
-    build:
-      context: .
-      dockerfile: Dockerfile
-    depends_on:
-      test-db:
-        condition: service_healthy
-    links:
-      - test-db
-    volumes:
-      - .:/app
-    command: ["composer", "run-script", "test"]

docker-compose.yml

@@ -0,0 +1,47 @@
+version: '3'
+
+# This files purpose is to run the PHPunit tests locally.
+# Install docker and docker compose and than just run:
+# docker compose up
+
+# To live debug in VSCode add this launch configuration to your .vscode/launch.json.
+# It assumes that the WordPress root-dir is your workspace root.
+#
+# {
+#   "name": "Listen for PHPUnit",
+#   "type": "php",
+#   "request": "launch",
+#   "port": 9003,
+#   "pathMappings": {
+#    "/app/": "${workspaceRoot}/wp-content/plugins/activitypub-event-extensions/",
+#    "/tmp/wordpress/": "${workspaceRoot}/"
+#   },
+# },
+
+services:
+  test-db:
+    image: mariadb
+    environment:
+      MARIADB_DATABASE: wordpress-test
+      MARIADB_ROOT_PASSWORD: wordpress-test
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      start_period: 2s
+      interval: 1s
+      timeout: 5s
+      retries: 10
+
+  test-php:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    depends_on:
+      test-db:
+        condition: service_healthy
+    links:
+      - test-db
+    volumes:
+      - .:/app
+    command: ["composer", "run-script", "test-debug"]
+    extra_hosts:
+      - "host.docker.internal:host-gateway"

includes/activitypub/transformer/class-event.php

@@ -35,7 +35,7 @@ class Event extends Post {
 	 *
 	 * @return string The User-URL.
 	 */
-	protected function get_actor() {
+	protected function get_actor(): ?string {
 		return $this->get_attributed_to();
 	}
 
@@ -46,10 +46,17 @@ class Event extends Post {
 	 *
 	 * @return string The Event Object-Type.
 	 */
-	protected function get_type() {
+	protected function get_type(): string {
 		return 'Event';
 	}
 
+	/**
+	 * Get a sane default for whether comments are enabled.
+	 */
+	protected function get_comments_enabled(): ?bool {
+		return comments_open( $this->wp_object );
+	}
+
 	/**
 	 * Returns the title of the event.
 	 *
@@ -57,7 +64,7 @@ class Event extends Post {
 	 *
 	 * @return string The name.
 	 */
-	protected function get_name() {
+	protected function get_name(): string {
 		return $this->wp_object->post_title;
 	}
 
@@ -72,10 +79,33 @@ class Event extends Post {
 		$this->wp_taxonomy = $wp_taxonomy;
 	}
 
+	/**
+	 * Extract the join mode.
+	 *
+	 * Currently we don't handle joins, we always mark events as external.
+	 *
+	 * @return string
+	 */
+	public function get_join_mode(): ?string {
+		return 'external';
+	}
+
+	/**
+	 * Extract the external participation url.
+	 *
+	 * Currently we don't handle joins, we always mark events as external.
+	 * We just link back to the events HTML representation on our WordPress site.
+	 *
+	 * @return ?string The external participation URL.
+	 */
+	public function get_external_participation_url(): ?string {
+		return 'external' === $this->get_join_mode() ? $this->get_url() : null;
+	}
+
 	/**
 	 * Set the event category, via the mapping setting.
 	 */
-	public function get_category() {
+	public function get_category(): ?string {
 		$current_category_mapping = \get_option( 'activitypub_event_extensions_event_category_mappings', array() );
 		$terms                    = \get_the_terms( $this->wp_object, $this->wp_taxonomy );
 
@@ -93,7 +123,7 @@ class Event extends Post {
 	 *
 	 * @return Event_Object
 	 */
-	public function to_object() {
+	public function to_object(): Event_Object {
 		$activitypub_object = new Event_Object();
 		$activitypub_object = $this->transform_object_properties( $activitypub_object );
 

includes/activitypub/transformer/class-events-manager.php

@@ -94,16 +94,21 @@ final class Events_Manager extends Event_Transformer {
 			return null;
 		}
 
-		$location    = new Place();
 		$em_location = $this->em_event->get_location();
 
+		if ( '' === $em_location->location_id ) {
+			return null;
+		}
+
+		$location = new Place();
 		$location->set_name( $em_location->location_name );
 
 		$address = array(
 			'type'            => 'PostalAddress',
 			'addressCountry'  => $em_location->location_country,
 			'addressLocality' => $em_location->location_town,
-			'streetAddress'   => $em_location->location_address,
+			'postalAddress'   => $em_location->location_address,
+			'postalCode'      => $em_location->location_postcode,
 			'name'            => $em_location->location_name,
 		);
 		if ( $em_location->location_state ) {
@@ -249,8 +254,10 @@ final class Events_Manager extends Event_Transformer {
 
 	/**
 	 * Get the events title/name.
+	 *
+	 * @return string
 	 */
-	protected function get_name() {
+	protected function get_name(): string {
 		return $this->em_event->event_name;
 	}
 
@@ -259,7 +266,7 @@ final class Events_Manager extends Event_Transformer {
 	 *
 	 * @return Activitypub\Activity\Event
 	 */
-	public function to_object() {
+	public function to_object(): Event {
 		$this->em_event     = new EM_Event( $this->wp_object->ID, 'post_id' );
 		$activitypub_object = new Event();
 

includes/activitypub/transformer/class-gatherpress.php

@@ -49,29 +49,18 @@ final class GatherPress extends Event {
 	protected $gp_venue;
 
 	/**
-	 * Get transformer name.
+	 * Extend the constructor, to also set the GatherPress objects.
 	 *
-	 * Retrieve the transformers name.
+	 * This is a special class object form The Events Calendar which
+	 * has a lot of useful functions, we make use of our getter functions.
 	 *
-	 * @since 1.0.0
+	 * @param WP_Post $wp_object The WordPress object.
-	 * @access public
+	 * @param string  $wp_taxonomy The taxonomy slug of the event post type.
-	 * @return string Widget name.
 	 */
-	public function get_transformer_name() {
+	public function __construct( $wp_object, $wp_taxonomy ) {
-		return 'gatherpress/gp-event';
+		parent::__construct( $wp_object, $wp_taxonomy );
-	}
+		$this->gp_event = new GatherPress_Event( $this->wp_object->ID );
-
+		$this->gp_venue = $this->gp_event->get_venue_information();
-	/**
-	 * Get transformer title.
-	 *
-	 * Retrieve the transformers label.
-	 *
-	 * @since 1.0.0
-	 * @access public
-	 * @return string Widget title.
-	 */
-	public function get_transformer_label() {
-		return 'GatherPress Event';
 	}
 
 	/**
@@ -90,15 +79,19 @@ final class GatherPress extends Event {
 	/**
 	 * Get the event location.
 	 *
-	 * @return array The Place.
+	 * @return Place|null The place objector null if not place set.
 	 */
-	public function get_location() {
+	public function get_location(): Place|null {
 		$address = $this->gp_venue['full_address'];
+		if ( $address ) {
 			$place = new Place();
 			$place->set_type( 'Place' );
 			$place->set_name( $address );
 			$place->set_address( $address );
 			return $place;
+		} else {
+			return null;
+		}
 	}
 
 	/**
@@ -134,7 +127,7 @@ final class GatherPress extends Event {
 	/**
 	 * Overrides/extends the get_attachments function to also add the event Link.
 	 */
-	protected function get_attachment() {
+	protected function get_attachment(): array {
 		$attachments = parent::get_attachment();
 		if ( count( $attachments ) ) {
 			$attachments[0]['type'] = 'Document';
@@ -154,7 +147,7 @@ final class GatherPress extends Event {
 	 *
 	 * @return string The User-URL.
 	 */
-	protected function get_attributed_to() {
+	protected function get_attributed_to(): string {
 		$user = new Blog();
 		return $user->get_url();
 	}
@@ -167,7 +160,7 @@ final class GatherPress extends Event {
 	 *
 	 * @return string $summary The custom event summary.
 	 */
-	public function get_summary() {
+	public function get_summary(): string {
 		if ( $this->wp_object->excerpt ) {
 			$excerpt = $this->wp_object->post_excerpt;
 		} elseif ( get_post_meta( $this->wp_object->ID, 'event-summary', true ) ) {
@@ -184,38 +177,31 @@ final class GatherPress extends Event {
 		return $summary;
 	}
 
+	/**
+	 * Get the content.
+	 */
+	public function get_content(): string {
+		return $this->wp_object->post_content;
+	}
+
+	/**
+	 * Determine whether the event is online.
+	 *
+	 * @return bool
+	 */
+	public function get_is_online(): bool {
+		return $this->gp_event->maybe_get_online_event_link() ? true : false;
+	}
+
+
 	/**
 	 * Transform the WordPress Object into an ActivityPub Object.
 	 *
 	 * @return Activitypub\Activity\Event
 	 */
-	public function to_object() {
+	public function to_object(): Event_Object {
-		$this->ap_object = new Event_Object();
+		$activitypub_object = parent::to_object();
-		$this->gp_event  = new GatherPress_Event( $this->wp_object->ID );
-		$this->gp_venue  = $this->gp_event->get_venue_information();
 
-		$this->ap_object = parent::to_object();
+		return $activitypub_object;
-
-		$this->ap_object->set_comments_enabled( 'open' === $this->wp_object->comment_status ? true : false );
-
-		$this->ap_object->set_external_participation_url( $this->get_url() );
-
-		$online_event_link = $this->gp_event->maybe_get_online_event_link();
-
-		if ( $online_event_link ) {
-			$this->ap_object->set_is_online( true );
-		} else {
-			$this->ap_object->set_is_online( false );
-		}
-
-		$this->ap_object->set_status( 'CONFIRMED' );
-
-		$this->ap_object->set_name( get_the_title( $this->wp_object->ID ) );
-
-		$this->ap_object->set_actor( get_rest_url_by_path( 'application' ) );
-		$this->ap_object->set_to( array( 'https://www.w3.org/ns/activitystreams#Public' ) );
-
-		$this->ap_object->set_location();
-		return $this->ap_object;
 	}
 }

includes/activitypub/transformer/class-the-events-calendar.php

@@ -14,6 +14,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 use Activitypub_Event_Extensions\Activitypub\Transformer\Event;
 use Activitypub\Activity\Extended_Object\Place;
+use Activitypub\Activity\Extended_Object\Event as Event_Object;
 use WP_Error;
 use WP_Post;
 
@@ -96,17 +97,6 @@ final class The_Events_Calendar extends Event {
 		return new WP_Error( 'invalid event_status value', __( 'invalid event_status', 'activitypub' ), array( 'status' => 404 ) );
 	}
 
-	/**
-	 * Extract the join mode.
-	 *
-	 * If the ticket sale is active set it to restricted.
-	 *
-	 * @return string
-	 */
-	public function get_join_mode() {
-		return empty( $this->tribe_event->tickets ) ? 'free' : 'restricted';
-	}
-
 	/**
 	 * Check if the comments are enabled for the current event.
 	 */
@@ -145,25 +135,55 @@ final class The_Events_Calendar extends Event {
 	 * @return Place|array The place/venue if one is set.
 	 */
 	public function get_location(): Place|null {
-		if ( empty( $this->wp_object->venues ) || ! empty( $this->wp_object->venues[0] ) ) {
+		// Get short handle for the venues.
+		$venues = $this->wp_object->venues;
+
+		// Get first venue. We currently only support a single venue.
+		if ( $venues instanceof \Tribe\Events\Collections\Lazy_Post_Collection ) {
+			$venue = $venues->first();
+		} elseif ( empty( $this->wp_object->venues ) || ! empty( $this->wp_object->venues[0] ) ) {
+			return null;
+		} else {
+			$venue = $venues[0];
+		}
+
+		if ( ! $venue ) {
 			return null;
 		}
-		// We currently only support a single venue.
-		$event_venue = $this->wp_object->venues[0];
 
-		$address = array(
+		// Set the address.
-			'addressCountry'  => $event_venue->country,
+		$address = array();
-			'addressLocality' => $event_venue->city,
+
-			'addressRegion'   => $event_venue->province,
+		if ( ! empty( $venue->country ) ) {
-			'postalCode'      => $event_venue->zip,
+			$address['addressCountry'] = $venue->country;
-			'streetAddress'   => $event_venue->address,
+		}
-			'type'            => 'PostalAddress',
+
-		);
+		if ( ! empty( $venue->city ) ) {
+			$address['addressLocality'] = $venue->city;
+		}
+
+		if ( ! empty( $venue->province ) ) {
+			$address['addressRegion'] = $venue->province;
+		}
+
+		if ( ! empty( $venue->zip ) ) {
+			$address['postalCode'] = $venue->zip;
+		}
+
+		if ( ! empty( $venue->address ) ) {
+			$address['streetAddress'] = $venue->address;
+		}
+		if ( ! empty( $venue->post_title ) ) {
+			$address['name'] = $venue->post_title;
+		}
+		$address['type'] = 'PostalAddress';
 
 		$location = new Place();
+		if ( count( $address ) > 1 ) {
 			$location->set_address( $address );
-		$location->set_id( $event_venue->permalink );
+		}
-		$location->set_name( $event_venue->post_name );
+		$location->set_id( $venue->permalink );
+		$location->set_name( $venue->post_title );
 
 		return $location;
 	}
@@ -175,7 +195,7 @@ final class The_Events_Calendar extends Event {
 	 *
 	 * @return Event_Object
 	 */
-	public function to_object() {
+	public function to_object(): Event_Object {
 		$activitypub_object = parent::to_object();
 
 		return $activitypub_object;

includes/activitypub/transformer/class-vs-event-list.php

@@ -27,7 +27,6 @@ if ( ! defined( 'ABSPATH' ) ) {
  * @since 1.0.0
  */
 final class VS_Event_List extends Event_Transformer {
-
 	/**
 	 * The target transformer ActivityPub Event object.
 	 *
@@ -35,19 +34,6 @@ final class VS_Event_List extends Event_Transformer {
 	 */
 	protected $ap_object;
 
-	/**
-	 * Get transformer name.
-	 *
-	 * Retrieve the transformers name.
-	 *
-	 * @since 1.0.0
-	 * @access public
-	 * @return string Widget name.
-	 */
-	public function get_transformer_name(): string {
-		return 'activitypub-event-transformers/vs-event';
-	}
-
 	/**
 	 * Returns the ActivityStreams 2.0 Object-Type for an Event.
 	 *
@@ -64,21 +50,28 @@ final class VS_Event_List extends Event_Transformer {
 	 *
 	 * @return Place The Place.
 	 */
-	public function get_location(): Place {
+	public function get_location(): ?Place {
 		$address = get_post_meta( $this->wp_object->ID, 'event-location', true );
+		if ( $address ) {
 			$place = new Place();
 			$place->set_type( 'Place' );
 			$place->set_name( $address );
 			$place->set_address( $address );
 			return $place;
+		} else {
+			return null;
+		}
 	}
 
 	/**
 	 * Get the end time from the events metadata.
 	 */
-	protected function get_end_time(): string {
+	protected function get_end_time(): ?string {
+		if ( 'yes' === get_post_meta( $this->wp_object->ID, 'event-hide-end-time', true ) ) {
+			return null;
+		}
 		$end_time = get_post_meta( $this->wp_object->ID, 'event-date', true );
-		return \gmdate( 'Y-m-d\TH:i:s\Z', $end_time );
+		return $end_time ? \gmdate( 'Y-m-d\TH:i:s\Z', $end_time ) : null;
 	}
 
 	/**
@@ -86,28 +79,32 @@ final class VS_Event_List extends Event_Transformer {
 	 */
 	protected function get_start_time(): string {
 		$start_time = get_post_meta( $this->wp_object->ID, 'event-start-date', true );
-		return \gmdate( 'Y-m-d\TH:i:s\Z', $start_time );
+		return $start_time ? \gmdate( 'Y-m-d\TH:i:s\Z', $start_time ) : null;
 	}
 
 	/**
 	 * Get the event link from the events metadata.
+	 *
+	 * @return ?array Associated array of an ActivityStreams Link object with the events URL.
 	 */
-	private function get_event_link(): array {
+	private function get_event_link(): ?array {
 		$event_link       = get_post_meta( $this->wp_object->ID, 'event-link', true );
+		$event_link_label = get_post_meta( $this->wp_object->ID, 'event-link-label', true ) ?? 'Event Link';
 		if ( $event_link ) {
 			return array(
 				'type'      => 'Link',
-				'name'      => 'Website',
+				'name'      => $event_link_label,
 				'href'      => \esc_url( $event_link ),
 				'mediaType' => 'text/html',
 			);
 		}
+		return null;
 	}
 
 	/**
 	 * Overrides/extends the get_attachments function to also add the event Link.
 	 */
-	protected function get_attachment() {
+	protected function get_attachment(): ?array {
 		$attachments = parent::get_attachment();
 		if ( count( $attachments ) ) {
 			$attachments[0]['type'] = 'Document';
@@ -128,7 +125,7 @@ final class VS_Event_List extends Event_Transformer {
 	 *
 	 * @return string $summary The custom event summary.
 	 */
-	public function get_summary() {
+	public function get_summary(): ?string {
 		if ( $this->wp_object->excerpt ) {
 			$excerpt = $this->wp_object->post_excerpt;
 		} elseif ( get_post_meta( $this->wp_object->ID, 'event-summary', true ) ) {

includes/class-setup.php

@@ -59,14 +59,15 @@ class Setup {
 	 * @since 1.0.0
 	 */
 	protected function __construct() {
-		$this->activitypub_plugin_is_active = is_plugin_active( 'activitypub/activitypub.php' );
+		$this->activitypub_plugin_is_active = defined( 'ACTIVITYPUB_PLUGIN_VERSION' ) ||
+			is_plugin_active( 'activitypub/activitypub.php' );
 		// BeforeFirstRelease: decide whether we want to do anything at all when ActivityPub plugin is note active.
 		// if ( ! $this->activitypub_plugin_is_active ) {
 		// deactivate_plugins( ACTIVITYPUB_EVENT_EXTENSIONS_PLUGIN_FILE );
 		// return;
 		// }.
 		$this->active_event_plugins       = self::detect_active_event_plugins();
-		$this->activitypub_plugin_version = get_file_data( WP_PLUGIN_DIR . '/activitypub/activitypub.php', array( 'Version' ) )[0];
+		$this->activitypub_plugin_version = self::get_activitypub_plugin_version();
 		$this->setup_hooks();
 	}
 
@@ -95,6 +96,19 @@ class Setup {
 		return self::$instance;
 	}
 
+	/**
+	 * LooksUp the current version of the ActivityPub.
+	 *
+	 * @return string The semantic Version.
+	 */
+	private static function get_activitypub_plugin_version(): string {
+		if ( defined( 'ACTIVITYPUB_PLUGIN_VERSION' ) ) {
+			return constant( 'ACTIVITYPUB_PLUGIN_VERSION' );
+		}
+		$version = get_file_data( WP_PLUGIN_DIR . '/activitypub/activitypub.php', array( 'Version' ) )[0];
+		return $version ?? '0.0.0';
+	}
+
 	/**
 	 * Getter function for the active event plugins.
 	 *
@@ -166,7 +180,7 @@ class Setup {
 		);
 
 		// Check if the minimum required version of the ActivityPub plugin is installed.
-		if ( version_compare( $this->activitypub_plugin_version, ACTIVITYPUB_EVENT_EXTENSIONS_ACTIVITYPUB_PLUGIN_MIN_VERSION ) ) {
+		if ( ! version_compare( $this->activitypub_plugin_version, ACTIVITYPUB_EVENT_EXTENSIONS_ACTIVITYPUB_PLUGIN_MIN_VERSION ) ) {
 			return;
 		}
 
@@ -206,7 +220,7 @@ class Setup {
 			// The ActivityPub plugin is not active.
 			add_action( 'admin_notices', array( 'Activitypub_Event_Extensions\Admin\General_Admin_Notices', 'activitypub_plugin_not_enabled' ), 10, 1 );
 		}
-		if ( version_compare( $this->activitypub_plugin_version, ACTIVITYPUB_EVENT_EXTENSIONS_ACTIVITYPUB_PLUGIN_MIN_VERSION ) ) {
+		if ( ! version_compare( $this->activitypub_plugin_version, ACTIVITYPUB_EVENT_EXTENSIONS_ACTIVITYPUB_PLUGIN_MIN_VERSION ) ) {
 			// The ActivityPub plugin is too old.
 			add_action( 'admin_notices', array( 'Activitypub_Event_Extensions\Admin\General_Admin_Notices', 'activitypub_plugin_version_too_old' ), 10, 1 );
 		}
@@ -234,9 +248,9 @@ class Setup {
 		// Get the transformer for a specific event plugins event-post type.
 		foreach ( $this->active_event_plugins as $event_plugin ) {
 			if ( $wp_object->post_type === $event_plugin->get_post_type() ) {
-				$transformer_class = $event_plugin->get_activitypub_event_transformer_class();
+				$transformer_class = $event_plugin::get_activitypub_event_transformer_class();
 				if ( class_exists( $transformer_class ) ) {
-					return new $transformer_class( $wp_object, $event_plugin->get_event_category_taxonomy() );
+					return new $transformer_class( $wp_object, $event_plugin::get_event_category_taxonomy() );
 				}
 			}
 		}
@@ -256,8 +270,8 @@ class Setup {
 		// If someone installs this plugin, we simply enable ActivityPub support for all currently active event post types.
 		$activitypub_supported_post_types = get_option( 'activitypub_support_post_types', array() );
 		foreach ( $this->active_event_plugins as $event_plugin ) {
-			if ( ! in_array( $event_plugin['post_type'], $activitypub_supported_post_types, true ) ) {
+			if ( ! in_array( $event_plugin->get_post_type(), $activitypub_supported_post_types, true ) ) {
-				$activitypub_supported_post_types[] = $event_plugin['post_type'];
+				$activitypub_supported_post_types[] = $event_plugin->get_post_type();
 			}
 		}
 		update_option( 'activitypub_support_post_types', $activitypub_supported_post_types );

tests/bootstrap.php

@@ -26,9 +26,58 @@ if ( ! file_exists( "{$_tests_dir}/includes/functions.php" ) ) {
 require_once "{$_tests_dir}/includes/functions.php";
 
 /**
- * Manually load the plugin being tested.
+ * Manually load the plugin being tested and its integrations.
  */
 function _manually_load_plugin() {
+	$plugin_dir = ABSPATH . '/wp-content/plugins/';
+
+	// Always manually load the ActivityPub plugin.
+	require_once $plugin_dir . 'activitypub/activitypub.php';
+
+	// Capture the --filter argument.
+	$activitypub_event_extension_integration_filter = null;
+	foreach ( $_SERVER['argv'] as $arg ) {
+		if ( strpos( $arg, '--filter=' ) === 0 ) {
+			$activitypub_event_extension_integration_filter = substr( $arg, strlen( '--filter=' ) );
+			break;
+		}
+	}
+
+	$plugin_file = null;
+	// See if we want to run integration tests for a specific event-plugin.
+	switch ( $activitypub_event_extension_integration_filter ) {
+		case 'the_events_calendar':
+			$plugin_file = 'the-events-calendar/the-events-calendar.php';
+			break;
+		case 'vs_event_list':
+			$plugin_file = 'very-simple-event-list/vsel.php';
+			break;
+		case 'events_manager':
+			$plugin_file = 'events-manager/events-manager.php';
+			break;
+		case 'gatherpress':
+			$plugin_file = 'gatherpress/gatherpress.php';
+			break;
+	}
+
+	if ( $plugin_file ) {
+		// Manually load the event plugin.
+		require_once $plugin_dir . $plugin_file;
+		$current   = get_option( 'active_plugins', array() );
+		$current[] = $plugin_file;
+		sort( $current );
+		update_option( 'active_plugins', $current );
+	}
+
+	// Hot fix that allows using Events Manager within unit tests, because the em_init() is later not run as admin.
+	if ( 'events_manager' === $activitypub_event_extension_integration_filter ) {
+		require_once $plugin_dir . 'events-manager/em-install.php';
+		em_create_events_table();
+		em_create_events_meta_table();
+		em_create_locations_table();
+	}
+
+	// At last manually load our WordPress plugin.
 	require dirname( __DIR__ ) . '/activitypub-event-extensions.php';
 }
 

tests/test-class-plugin-events-manger.php

@@ -0,0 +1,184 @@
+<?php
+/**
+ * Class SampleTest
+ *
+ * @package Activitypub_Event_Extensions
+ */
+
+/**
+ * Sample test case.
+ */
+class Test_Events_Manager extends WP_UnitTestCase {
+	/**
+	 * Override the setup function, so that tests don't run if the Events Calendar is not active.
+	 */
+	public function set_up() {
+		parent::set_up();
+
+		if ( ! class_exists( 'EM_Events' ) ) {
+			self::markTestSkipped( 'VS Event List plugin is not active.' );
+		}
+
+		// For tests allow every user to create new events.
+		update_option( 'dbem_events_anonymous_submissions', true );
+
+		// Make sure that ActivityPub support is enabled for Events Manager.
+		$aec = \Activitypub_Event_Extensions\Setup::get_instance();
+		$aec->activate_activitypub_support_for_active_event_plugins();
+
+		// Delete all posts afterwards.
+		_delete_all_posts();
+	}
+
+	/**
+	 * Test that the right transformer gets applied.
+	 */
+	public function test_transformer_class() {
+		// We only test for one event plugin being active at the same time,
+		// even though we support multiple onces in theory.
+		// But testing all combinations is beyond scope.
+		$active_event_plugins = \Activitypub_Event_Extensions\Setup::get_instance()->get_active_event_plugins();
+		$this->assertEquals( 1, count( $active_event_plugins ) );
+
+		// Enable ActivityPub support for the event plugin.
+		$this->assertContains( EM_POST_TYPE_EVENT, get_option( 'activitypub_support_post_types' ) );
+
+		// Insert a new Event.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'Events Manager Test event',
+				'post_status' => 'published',
+				'post_type'   => EM_POST_TYPE_EVENT,
+				'meta_input'  => array(
+					'event_start_time' => strtotime( '+10 days 15:00:00' ),
+				),
+			)
+		);
+
+		$wp_object = get_post( $wp_post_id );
+
+		// Call the transformer Factory.
+		$transformer = \Activitypub\Transformer\Factory::get_transformer( $wp_object );
+
+		// Check that we got the right transformer.
+		$this->assertInstanceOf( \Activitypub_Event_Extensions\Activitypub\Transformer\Events_Manager::class, $transformer );
+	}
+
+	/**
+	 * Test the transformation of a minimal event.
+	 */
+	public function test_transform_of_minimal_event() {
+		// Create mockup event.
+		$event                   = new EM_Event();
+		$event->event_name       = 'Events Manager Test event';
+		$event->post_content     = 'Event description';
+		$event->event_start_date = gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) );
+		$event->event_start_time = '15:00:00';
+		$event->start            = strtotime( $event->event_start_date . ' ' . $event->event_start_time );
+		$event->force_status     = 'published';
+		$event->event_rsvp       = false;
+		$this->assertTrue( $event->save() );
+
+		// Call the transformer Factory.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $event->post_id ) )->to_object()->to_array();
+
+		// Check that we got the right transformer.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'Events Manager Test event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( comments_open( $event->post_id ), $event_array['commentsEnabled'] );
+		$this->assertEquals( comments_open( $event->post_id ) ? 'allow_all' : 'closed', $event_array['repliesModerationOption'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertArrayNotHasKey( 'location', $event_array );
+		$this->assertArrayNotHasKey( 'endTime', $event_array );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+	}
+
+	/**
+	 * Test the transformation of a event with full location.
+	 */
+	public function test_transform_of__full_event_with_location() {
+		// Create a mockup location.
+		$location                    = new EM_Location();
+		$location->location_name     = 'Test location';
+		$location->location_address  = 'Test Address';
+		$location->location_town     = 'Test Town';
+		$location->location_state    = 'Test state';
+		$location->location_postcode = '1337';
+		$location->location_region   = 'Test region';
+		$location->location_country  = 'AT'; // Must be a two char country code.
+		$this->assertTrue( $location->save() );
+
+		// Create mockup event.
+		$event                   = new EM_Event();
+		$event->event_name       = 'Events Manager Test event';
+		$event->post_content     = 'Event description';
+		$event->location_id      = $location->location_id;
+		$event->event_start_date = gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) );
+		$event->event_end_date   = gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) );
+		$event->event_start_time = '15:00:00';
+		$event->event_end_time   = '16:00:00';
+		$event->start            = strtotime( $event->event_start_date . ' ' . $event->event_start_time );
+		$event->end              = strtotime( $event->event_end_date . ' ' . $event->event_end_time );
+		$event->force_status     = 'published';
+		$event->event_rsvp       = false;
+		$this->assertTrue( $event->save() );
+
+		// Call the transformer Factory.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $event->post_id ) )->to_object()->to_array();
+
+		// Check that we got the right transformer.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'Events Manager Test event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+		$this->assertArrayHasKey( 'location', $event_array );
+		$this->assertEquals( 'Test location', $event_array['location']['name'] );
+		$this->assertEquals( 'Test Address', $event_array['location']['address']['postalAddress'] );
+		$this->assertEquals( 'Test Town', $event_array['location']['address']['addressLocality'] );
+		$this->assertEquals( 'Test state', $event_array['location']['address']['addressRegion'] );
+		$this->assertEquals( '1337', $event_array['location']['address']['postalCode'] );
+		$this->assertEquals( 'AT', $event_array['location']['address']['addressCountry'] );
+	}
+
+	/**
+	 * Test the transformation of a minimal event.
+	 */
+	public function test_transform_of_event_with_name_only_location() {
+		// Create a mockup location.
+		$location                = new EM_Location();
+		$location->location_name = 'Name only location';
+		$this->assertTrue( $location->save() );
+
+		// Create mockup event.
+		$event                   = new EM_Event();
+		$event->event_name       = 'Events Manager Test event';
+		$event->post_content     = 'Event description';
+		$event->location_id      = $location->location_id;
+		$event->event_start_date = gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) );
+		$event->event_end_date   = gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) );
+		$event->event_start_time = '15:00:00';
+		$event->event_end_time   = '16:00:00';
+		$event->start            = strtotime( $event->event_start_date . ' ' . $event->event_start_time );
+		$event->end              = strtotime( $event->event_end_date . ' ' . $event->event_end_time );
+		$event->force_status     = 'published';
+		$event->event_rsvp       = false;
+		$this->assertTrue( $event->save() );
+
+		// Call the transformer Factory.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $event->post_id ) )->to_object()->to_array();
+
+		// Check that we got the right transformer.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'Events Manager Test event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+		$this->assertArrayHasKey( 'location', $event_array );
+		$this->assertEquals( 'Name only location', $event_array['location']['name'] );
+	}
+}

tests/test-class-plugin-gatherpress.php

@@ -0,0 +1,103 @@
+<?php
+/**
+ * Class SampleTest
+ *
+ * @package Activitypub_Event_Extensions
+ */
+
+/**
+ * Sample test case.
+ */
+class Test_GatherPress extends WP_UnitTestCase {
+	/**
+	 * Override the setup function, so that tests don't run if the Events Calendar is not active.
+	 */
+	public function set_up() {
+		parent::set_up();
+
+		if ( ! defined( 'GATHERPRESS_CORE_FILE' ) ) {
+			self::markTestSkipped( 'GatherPress plugin is not active.' );
+		}
+
+		// Mock the plugin activation.
+		GatherPress\Core\Setup::get_instance()->activate_gatherpress_plugin( false );
+
+		// Make sure that ActivityPub support is enabled for The Events Calendar.
+		$aec = \Activitypub_Event_Extensions\Setup::get_instance();
+		$aec->activate_activitypub_support_for_active_event_plugins();
+
+		// Delete all posts afterwards.
+		_delete_all_posts();
+	}
+
+	/**
+	 * Test that the right transformer gets applied.
+	 */
+	public function test_transformer_class() {
+		// We only test for one event plugin being active at the same time,
+		// even though we support multiple onces in theory.
+		// But testing all combinations is beyond scope.
+		$active_event_plugins = \Activitypub_Event_Extensions\Setup::get_instance()->get_active_event_plugins();
+		$this->assertEquals( 1, count( $active_event_plugins ) );
+
+		// Enable ActivityPub support for the event plugin.
+		$this->assertContains( 'gatherpress_event', get_option( 'activitypub_support_post_types' ) );
+
+		// Mock GatherPress Event.
+		$post_id = wp_insert_post(
+			array(
+				'post_title'   => 'Unit Test Event',
+				'post_type'    => 'gatherpress_event',
+				'post_content' => 'Unit Test description.',
+			)
+		);
+		$event   = new \GatherPress\Core\Event( $post_id );
+		$params  = array(
+			'datetime_start' => '+10 days 15:00:00',
+			'datetime_end'   => '+10 days 16:00:00',
+			'timezone'       => 'America/New_York',
+		);
+
+		$event->save_datetimes( $params );
+
+		// Call the transformer Factory.
+		$transformer = \Activitypub\Transformer\Factory::get_transformer( $event->event );
+
+		// Check that we got the right transformer.
+		$this->assertInstanceOf( \Activitypub_Event_Extensions\Activitypub\Transformer\GatherPress::class, $transformer );
+	}
+
+	/**
+	 * Test transformation to ActivityPUb for basic event.
+	 */
+	public function test_transform_of_basic_event() {
+		// Mock GatherPress Event.
+		$post_id = wp_insert_post(
+			array(
+				'post_title'   => 'Unit Test Event',
+				'post_type'    => 'gatherpress_event',
+				'post_content' => 'Unit Test description.',
+				'post_status'  => 'published',
+			)
+		);
+		$event   = new \GatherPress\Core\Event( $post_id );
+		$params  = array(
+			'datetime_start' => '+10 days 15:00:00',
+			'datetime_end'   => '+10 days 16:00:00',
+			'timezone'       => 'America/New_York',
+		);
+		$event->save_datetimes( $params );
+
+		// Call the transformer Factory.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $event->event )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'Unit Test Event', $event_array['name'] );
+		$this->assertEquals( 'Unit Test description.', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertArrayNotHasKey( 'location', $event_array );
+	}
+}

tests/test-class-plugin-the-events-calendar.php

@@ -0,0 +1,216 @@
+<?php
+/**
+ * Class SampleTest
+ *
+ * @package Activitypub_Event_Extensions
+ */
+
+/**
+ * Sample test case.
+ */
+class Test_The_Events_Calendar extends WP_UnitTestCase {
+	/**
+	 * Mockup events of certain complexity.
+	 */
+	public const MOCKUP_VENUS = array(
+		'minimal_venue' => array(
+			'venue'  => 'Minimal Venue',
+			'status' => 'publish',
+		),
+		'complex_venue' => array(
+			'venue'         => 'Complex Venue',
+			'status'        => 'publish',
+			'show_map'      => false,
+			'show_map_link' => false,
+			'address'       => 'Venue address',
+			'city'          => 'Venue city',
+			'country'       => 'Venue country',
+			'province'      => 'Venue province',
+			'state'         => 'Venue state',
+			'stateprovince' => 'Venue stateprovince',
+			'zip'           => 'Venue zip',
+			'phone'         => 'Venue phone',
+			'website'       => 'http://venue.com',
+		),
+	);
+
+	public const MOCKUP_EVENTS = array(
+		'minimal_event' => array(
+			'title'      => 'My Event',
+			'content'    => 'Come to my event. Let\'s connect!',
+			'start_date' => '+10 days 15:00:00',
+			'duration'   => HOUR_IN_SECONDS,
+			'status'     => 'publish',
+		),
+		'complex_event' => array(
+			'title'      => 'My Event',
+			'content'    => 'Come to my event. Let\'s connect!',
+			'start_date' => '+10 days 15:00:00',
+			'duration'   => HOUR_IN_SECONDS,
+			'status'     => 'publish',
+		),
+	);
+
+	/**
+	 * Override the setup function, so that tests don't run if the Events Calendar is not active.
+	 */
+	public function set_up() {
+		parent::set_up();
+
+		if ( ! class_exists( '\Tribe__Events__Main' ) ) {
+			self::markTestSkipped( 'The Events Calendar plugin is not active.' );
+		}
+
+		// Make sure that ActivityPub support is enabled for The Events Calendar.
+		$aec = \Activitypub_Event_Extensions\Setup::get_instance();
+		$aec->activate_activitypub_support_for_active_event_plugins();
+
+		// Delete all posts afterwards.
+		_delete_all_posts();
+	}
+
+	/**
+	 * Test that the right transformer gets applied.
+	 */
+	public function test_the_events_calendar_transformer_class() {
+		// We only test for one event plugin being active at the same time,
+		// even though we support multiple onces in theory.
+		// But testing all combinations is beyond scope.
+		$active_event_plugins = \Activitypub_Event_Extensions\Setup::get_instance()->get_active_event_plugins();
+		$this->assertEquals( 1, count( $active_event_plugins ) );
+
+		// Enable ActivityPub support for the event plugin.
+		$this->assertContains( 'tribe_events', get_option( 'activitypub_support_post_types' ) );
+
+		// Create a The Events Calendar Event without content.
+		$wp_object = tribe_events()
+			->set_args( self::MOCKUP_EVENTS['minimal_event'] )
+			->create();
+
+		// Call the transformer Factory.
+		$transformer = \Activitypub\Transformer\Factory::get_transformer( $wp_object );
+
+		// Check that we got the right transformer.
+		$this->assertInstanceOf( \Activitypub_Event_Extensions\Activitypub\Transformer\The_Events_Calendar::class, $transformer );
+	}
+
+	/**
+	 * Test transformation of minimal event without venue.
+	 */
+	public function test_transform_of_minimal_event_without_venue() {
+		// Create a The Events Calendar Event.
+		$wp_object = tribe_events()
+			->set_args( self::MOCKUP_EVENTS['minimal_event'] )
+			->create();
+
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $wp_object )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'My Event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertTrue( $event_array['commentsEnabled'] );
+		$this->assertEquals( 'allow_all', $event_array['repliesModerationOption'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertArrayNotHasKey( 'location', $event_array );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+	}
+
+	/**
+	 * Test transformation of event with mapped category.
+	 */
+	public function test_transform_event_with_mapped_categories() {
+		// Create category.
+		$category_id_music   = wp_insert_term( 'Music', Tribe__Events__Main::TAXONOMY, array( 'slug' => 'music' ) );
+		$category_id_theatre = wp_insert_term( 'Theatre', Tribe__Events__Main::TAXONOMY, array( 'slug' => 'theatre' ) );
+
+		// Set default mapping for event categories.
+		update_option( 'activitypub_event_extensions_default_event_category', 'MUSIC' );
+
+		// Set an override for the category with the slug theatre.
+		update_option( 'activitypub_event_extensions_event_category_mappings', array( 'theatre' => 'THEATRE' ) );
+
+		// Create a The Events Calendar event with the music category.
+		$wp_object = tribe_events()
+			->set_args( self::MOCKUP_EVENTS['minimal_event'] )
+			->create();
+		// Set the post term music to the event.
+		wp_set_post_terms( $wp_object->ID, $category_id_music['term_id'], Tribe__Events__Main::TAXONOMY );
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $wp_object )->to_object()->to_array();
+		// See if the default category mapping is applied.
+		$this->assertEquals( 'MUSIC', $event_array['category'] );
+
+		// Set the post term theatre to the event.
+		wp_set_post_terms( $wp_object->ID, $category_id_theatre['term_id'], Tribe__Events__Main::TAXONOMY, false );
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $wp_object )->to_object()->to_array();
+		// See if the default category mapping is applied.
+		$this->assertEquals( 'THEATRE', $event_array['category'] );
+	}
+
+	/**
+	 * Test transformation of  minimal event with minimal venue.
+	 */
+	public function test_transform_of_minimal_event_with_venue() {
+		// Create Venue.
+		$venue = tribe_venues()->set_args( self::MOCKUP_VENUS['minimal_venue'] )->create();
+		// Create a The Events Calendar Event.
+		$wp_object = tribe_events()
+			->set_args( self::MOCKUP_EVENTS['complex_event'] )
+			->set( 'venue', $venue->ID )
+			->create();
+
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $wp_object )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'My Event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['commentsEnabled'] );
+		$this->assertArrayHasKey( 'location', $event_array );
+		$this->assertEquals( 'Place', $event_array['location']['type'] );
+		$this->assertEquals( self::MOCKUP_VENUS['minimal_venue']['venue'], $event_array['location']['name'] );
+	}
+
+	/**
+	 * Test transformation of  minimal event with fully filled venue.
+	 */
+	public function test_transform_of_minimal_event_with_address_venue() {
+		// Create Venue.
+		$venue = tribe_venues()->set_args( self::MOCKUP_VENUS['complex_venue'] )->create();
+		// Create a The Events Calendar Event.
+		$wp_object = tribe_events()
+			->set_args( self::MOCKUP_EVENTS['minimal_event'] )
+			->set( 'venue', $venue->ID )
+			->create();
+
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( $wp_object )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'My Event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['commentsEnabled'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 16:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertArrayHasKey( 'location', $event_array );
+		$this->assertEquals( 'Place', $event_array['location']['type'] );
+		$this->assertEquals( 'PostalAddress', $event_array['location']['address']['type'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['venue'], $event_array['location']['name'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['venue'], $event_array['location']['address']['name'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['province'], $event_array['location']['address']['addressRegion'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['address'], $event_array['location']['address']['streetAddress'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['city'], $event_array['location']['address']['addressLocality'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['country'], $event_array['location']['address']['addressCountry'] );
+		$this->assertEquals( self::MOCKUP_VENUS['complex_venue']['zip'], $event_array['location']['address']['postalCode'] );
+	}
+}

tests/test-class-plugin-vs-event-list.php

@@ -0,0 +1,211 @@
+<?php
+/**
+ * Class SampleTest
+ *
+ * @package Activitypub_Event_Extensions
+ */
+
+/**
+ * Sample test case.
+ */
+class Test_VS_Event_List extends WP_UnitTestCase {
+	/**
+	 * Override the setup function, so that tests don't run if the Events Calendar is not active.
+	 */
+	public function set_up() {
+		parent::set_up();
+
+		if ( ! function_exists( 'vsel_custom_post_type' ) ) {
+			self::markTestSkipped( 'VS Event List plugin is not active.' );
+		}
+
+		// Make sure that ActivityPub support is enabled for The Events Calendar.
+		$aec = \Activitypub_Event_Extensions\Setup::get_instance();
+		$aec->activate_activitypub_support_for_active_event_plugins();
+
+		// Delete all posts afterwards.
+		_delete_all_posts();
+	}
+
+	/**
+	 * Test that the right transformer gets applied.
+	 */
+	public function test_transformer_class() {
+		// We only test for one event plugin being active at the same time,
+		// even though we support multiple onces in theory.
+		// But testing all combinations is beyond scope.
+		$active_event_plugins = \Activitypub_Event_Extensions\Setup::get_instance()->get_active_event_plugins();
+		$this->assertEquals( 1, count( $active_event_plugins ) );
+
+		// Enable ActivityPub support for the event plugin.
+		$this->assertContains( 'event', get_option( 'activitypub_support_post_types' ) );
+
+		// Insert a new Event.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'VSEL Test Event',
+				'post_status' => 'published',
+				'post_type'   => 'event',
+				'meta_input'  => array(
+					'event-start-date' => strtotime( '+10 days 15:00:00' ),
+				),
+			)
+		);
+
+		$wp_object = get_post( $wp_post_id );
+
+		// Call the transformer Factory.
+		$transformer = \Activitypub\Transformer\Factory::get_transformer( $wp_object );
+
+		// Check that we got the right transformer.
+		$this->assertInstanceOf( \Activitypub_Event_Extensions\Activitypub\Transformer\VS_Event_List::class, $transformer );
+	}
+
+	/**
+	 * Test the transformation to ActivityStreams of minimal event.
+	 */
+	public function test_transform_of_minimal_event() {
+		// Insert a new Event.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'VSEL Test Event',
+				'post_status' => 'published',
+				'post_type'   => 'event',
+				'meta_input'  => array(
+					'event-start-date' => strtotime( '+10 days 15:00:00' ),
+				),
+			)
+		);
+
+		// Transform the event to ActivityStreams.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $wp_post_id ) )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'VSEL Test Event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertArrayNotHasKey( 'endTime', $event_array );
+		$this->assertEquals( comments_open( $wp_post_id ), $event_array['commentsEnabled'] );
+		$this->assertEquals( comments_open( $wp_post_id ) ? 'allow_all' : 'closed', $event_array['repliesModerationOption'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertEquals( esc_url( get_permalink( $wp_post_id ) ), $event_array['externalParticipationUrl'] );
+		$this->assertArrayNotHasKey( 'location', $event_array );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+	}
+
+	/**
+	 * Test the transformation to ActivityStreams of minimal event.
+	 */
+	public function test_transform_of_full_event() {
+		// Insert a new Event.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'VSEL Test Event',
+				'post_status' => 'published',
+				'post_type'   => 'event',
+				'meta_input'  => array(
+					'event-start-date' => strtotime( '+10 days 15:00:00' ),
+					'event-date'       => strtotime( '+10 days 16:00:00' ),
+					'event-link'       => 'https://event-federation.eu/vsel-test-event',
+					'event-link-label' => 'Website',
+				),
+			)
+		);
+
+		// Transform the event to ActivityStreams.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $wp_post_id ) )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertEquals( 'Event', $event_array['type'] );
+		$this->assertEquals( 'VSEL Test Event', $event_array['name'] );
+		$this->assertEquals( '', $event_array['content'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T15:00:00Z', $event_array['startTime'] );
+		$this->assertEquals( gmdate( 'Y-m-d', strtotime( '+10 days 15:00:00' ) ) . 'T16:00:00Z', $event_array['endTime'] );
+		$this->assertEquals( comments_open( $wp_post_id ), $event_array['commentsEnabled'] );
+		$this->assertEquals( comments_open( $wp_post_id ) ? 'allow_all' : 'closed', $event_array['repliesModerationOption'] );
+		$this->assertEquals( 'external', $event_array['joinMode'] );
+		$this->assertEquals( esc_url( get_permalink( $wp_post_id ) ), $event_array['externalParticipationUrl'] );
+		$this->assertArrayNotHasKey( 'location', $event_array );
+		$this->assertEquals( 'MEETING', $event_array['category'] );
+		$this->assertContains(
+			array(
+				'type'      => 'Link',
+				'name'      => 'Website',
+				'href'      => 'https://event-federation.eu/vsel-test-event',
+				'mediaType' => 'text/html',
+			),
+			$event_array['attachment']
+		);
+	}
+
+	/**
+	 * Test the transformation to ActivityStreams of event with hidden end time.
+	 */
+	public function test_transform_of_event_with_hidden_end_time() {
+		// Insert a new Event.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'VSEL Test Event',
+				'post_status' => 'published',
+				'post_type'   => 'event',
+				'meta_input'  => array(
+					'event-start-date'    => strtotime( '+10 days 15:00:00' ),
+					'event-date'          => strtotime( '+10 days 16:00:00' ),
+					'event-hide-end-time' => 'yes',
+				),
+			)
+		);
+
+		// Transform the event to ActivityStreams.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $wp_post_id ) )->to_object()->to_array();
+
+		// Check that the event ActivityStreams representation contains everything as expected.
+		$this->assertArrayNotHasKey( 'endTime', $event_array );
+	}
+
+	/**
+	 * Test transformation of event with mapped category.
+	 */
+	public function test_transform_event_with_mapped_categories() {
+		// Create category.
+		$category_id_music   = wp_insert_term( 'Music', 'event_cat', array( 'slug' => 'music' ) );
+		$category_id_theatre = wp_insert_term( 'Theatre', 'event_cat', array( 'slug' => 'theatre' ) );
+
+		// Set default mapping for event categories.
+		update_option( 'activitypub_event_extensions_default_event_category', 'MUSIC' );
+
+		// Set an override for the category with the slug theatre.
+		update_option( 'activitypub_event_extensions_event_category_mappings', array( 'theatre' => 'THEATRE' ) );
+
+		// Create a VS Event List event with the music category.
+		$wp_post_id = wp_insert_post(
+			array(
+				'post_title'  => 'VSEL Test Event',
+				'post_status' => 'published',
+				'post_type'   => 'event',
+				'meta_input'  => array(
+					'event-start-date'    => strtotime( '+10 days 15:00:00' ),
+					'event-date'          => strtotime( '+10 days 16:00:00' ),
+					'event-hide-end-time' => 'yes',
+				),
+			)
+		);
+		wp_set_post_terms( $wp_post_id, $category_id_music['term_id'], 'event_cat' );
+
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $wp_post_id ) )->to_object()->to_array();
+
+		// See if the default category mapping is applied.
+		$this->assertEquals( 'MUSIC', $event_array['category'] );
+
+		// Change the event category to theatre.
+		wp_set_post_terms( $wp_post_id, $category_id_theatre['term_id'], 'event_cat', false );
+
+		// Call the transformer.
+		$event_array = \Activitypub\Transformer\Factory::get_transformer( get_post( $wp_post_id ) )->to_object()->to_array();
+
+		// See if the default category mapping is applied.
+		$this->assertEquals( 'THEATRE', $event_array['category'] );
+	}
+}

tests/test-class-sample.php

@@ -1,20 +0,0 @@
-<?php
-/**
- * Class SampleTest
- *
- * @package Activitypub_Event_Extensions
- */
-
-/**
- * Sample test case.
- */
-class Test_Sample extends WP_UnitTestCase {
-
-	/**
-	 * A single example test.
-	 */
-	public function test_sample() {
-		// Replace this with some actual testing code.
-		$this->assertTrue( true );
-	}
-}