diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 17902d48..c08f020b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -46,4 +46,6 @@ jobs:
         run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
 
       - name: Run tests
+        env:
+          WP_TESTS_DIR: /tmp/wordpress-tests-lib/
         run: vendor/bin/phpunit
diff --git a/.wp-env.json b/.wp-env.json
index 2bf44411..eede0128 100644
--- a/.wp-env.json
+++ b/.wp-env.json
@@ -1,7 +1,8 @@
 {
-  "core": "WordPress/WordPress#master",
+  "core": null,
+  "phpVersion": "8.3",
   "plugins": [
-    "GlotPress/GlotPress#local",
+    "GlotPress/GlotPress",
     "https://downloads.wordpress.org/plugin/sqlite-object-cache.1.3.7.zip",
     "."
   ],
diff --git a/bin/install-wp-tests.sh b/bin/install-wp-tests.sh
index c6f53dc5..c6417b0d 100755
--- a/bin/install-wp-tests.sh
+++ b/bin/install-wp-tests.sh
@@ -176,6 +176,11 @@ install_db() {
 	fi
 }
 
+install_gp() {
+	git clone --branch develop --single-branch -q https://github.com/GlotPress/GlotPress.git "$WP_CORE_DIR/wp-content/plugins/glotpress"
+}
+
 install_wp
 install_test_suite
 install_db
+install_gp
diff --git a/bin/run-tests.sh b/bin/run-tests.sh
deleted file mode 100755
index 9aeab8c5..00000000
--- a/bin/run-tests.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-
-# This is only for use in development environments, it's not used in CI.
-# You can call this with: composer dev:test
-
-set -ex
-
-wp-env run tests-cli --env-cwd=wp-content/plugins/wporg-gp-translation-events sh -c 'wp db query < schema.sql'
-wp-env run tests-cli --env-cwd=wp-content/plugins/wporg-gp-translation-events ./vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index b6a3b1f9..504366c3 100644
--- a/composer.json
+++ b/composer.json
@@ -10,11 +10,11 @@
     "scripts":{
         "lint": "phpcs --standard=phpcs.xml -s",
         "lint:fix": "phpcbf --standard=phpcs.xml",
-        "dev:start": "wp-env start --debug && wp-env run cli wp rewrite structure '/%postname%/'",
+        "dev:start": "wp-env start && wp-env run cli wp rewrite structure '/%postname%/'",
         "dev:debug": "wp-env start --xdebug",
         "dev:stop": "wp-env stop",
         "dev:db:schema": "wp-env run cli --env-cwd=wp-content/plugins/wporg-gp-translation-events sh -c 'wp db query < schema.sql'",
-        "dev:test": "bin/run-tests.sh"
+        "dev:test": "wp-env run tests-cli --env-cwd=wp-content/plugins/wporg-gp-translation-events ./vendor/bin/phpunit"
     },
     "config": {
         "allow-plugins": {
diff --git a/includes/translation-listener.php b/includes/stats-listener.php
similarity index 99%
rename from includes/translation-listener.php
rename to includes/stats-listener.php
index 011e4389..2eb1af9d 100644
--- a/includes/translation-listener.php
+++ b/includes/stats-listener.php
@@ -8,7 +8,7 @@
 use GP_Translation;
 use GP_Translation_Set;
 
-class Translation_Listener {
+class Stats_Listener {
 	const ACTION_CREATE          = 'create';
 	const ACTION_APPROVE         = 'approve';
 	const ACTION_REJECT          = 'reject';
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index ac7184ac..e324c36e 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -8,8 +8,8 @@
 	convertWarningsToExceptions="true"
 	>
 	<testsuites>
-		<testsuite name="unit">
-			<directory suffix=".php">./tests/unit/</directory>
+		<testsuite name="tests">
+			<directory suffix=".php">./tests/</directory>
 		</testsuite>
 	</testsuites>
 </phpunit>
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index b0a0c0a0..5f6a4cc2 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -5,6 +5,15 @@
 	$_tests_dir = rtrim( sys_get_temp_dir(), '/\\' ) . '/wordpress-tests-lib';
 }
 
+function _glotpress_path( string $path ): string {
+	$glotpress_path = dirname( __DIR__, 2 ) . '/glotpress/';
+	if ( getenv( 'GITHUB_ACTIONS' ) ) {
+		$glotpress_path = '/tmp/wordpress/wp-content/plugins/glotpress/';
+	}
+
+	return $glotpress_path . $path;
+}
+
 // Forward custom PHPUnit Polyfills configuration to PHPUnit bootstrap file.
 $_phpunit_polyfills_path = getenv( 'WP_TESTS_PHPUNIT_POLYFILLS_PATH' );
 if ( false !== $_phpunit_polyfills_path ) {
@@ -19,14 +28,42 @@
 // Give access to tests_add_filter() function.
 require_once "$_tests_dir/includes/functions.php";
 
+function _apply_plugin_schema() {
+	$schema_path = __DIR__ . '/../schema.sql';
+	// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
+	$statements = explode( ';', file_get_contents( $schema_path ) );
+
+	global $wpdb;
+	foreach ( $statements as $statement ) {
+		$sql = trim( $statement );
+		if ( ! $sql ) {
+			continue;
+		}
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching
+		// phpcs:disable WordPress.DB.PreparedSQL.NotPrepared
+		$wpdb->query( $sql );
+		// phpcs:enable
+	}
+}
+tests_add_filter( 'muplugins_loaded', '_apply_plugin_schema' );
+
 /**
  * Manually load the plugin being tested.
  */
 function _manually_load_plugin() {
-	require dirname( __DIR__ ) . '/wporg-gp-translation-events.php';
+	require_once _glotpress_path( '/tests/phpunit/includes/loader.php' );
+	require_once dirname( __DIR__ ) . '/wporg-gp-translation-events.php';
 }
-
 tests_add_filter( 'muplugins_loaded', '_manually_load_plugin' );
 
+global $wp_tests_options;
+$wp_tests_options['permalink_structure'] = '/%postname%';
+
 // Start up the WP testing environment.
 require "$_tests_dir/includes/bootstrap.php";
+
+// Require GlotPress test code.
+require_once _glotpress_path( '/tests/phpunit/lib/testcase.php' );
+require_once _glotpress_path( '/tests/phpunit/lib/testcase-route.php' );
+require_once _glotpress_path( '/tests/phpunit/lib/testcase-request.php' );
diff --git a/tests/lib/event-factory.php b/tests/lib/event-factory.php
new file mode 100644
index 00000000..e1e630ca
--- /dev/null
+++ b/tests/lib/event-factory.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace Wporg\TranslationEvents\Tests;
+
+use DateTimeImmutable;
+use DateTimeZone;
+use WP_UnitTest_Factory_For_Post;
+use WP_UnitTest_Generator_Sequence;
+use Wporg\TranslationEvents\Route;
+
+class Event_Factory extends WP_UnitTest_Factory_For_Post {
+	public function __construct( $factory = null ) {
+		parent::__construct( $factory );
+		$this->default_generation_definitions = array(
+			'post_status'  => 'publish',
+			'post_title'   => new WP_UnitTest_Generator_Sequence( 'Event title %s' ),
+			'post_content' => new WP_UnitTest_Generator_Sequence( 'Event content %s' ),
+			'post_excerpt' => new WP_UnitTest_Generator_Sequence( 'Event excerpt %s' ),
+			'post_type'    => 'event',
+		);
+	}
+
+	public function create_draft(): int {
+		$now = new DateTimeImmutable( 'now', new DateTimeZone( 'UTC' ) );
+
+		$event_id = $this->create_event(
+			$now->modify( '-1 hours' ),
+			$now->modify( '+1 hours' ),
+			array(),
+		);
+
+		$event              = get_post( $event_id );
+		$event->post_status = 'draft';
+		wp_update_post( $event );
+
+		return $event_id;
+	}
+
+	public function create_active( array $attendee_ids = array() ): int {
+		$now = new DateTimeImmutable( 'now', new DateTimeZone( 'UTC' ) );
+
+		return $this->create_event(
+			$now->modify( '-1 hours' ),
+			$now->modify( '+1 hours' ),
+			$attendee_ids,
+		);
+	}
+
+	public function create_inactive_past( array $attendee_ids = array() ): int {
+		$now = new DateTimeImmutable( 'now', new DateTimeZone( 'UTC' ) );
+
+		return $this->create_event(
+			$now->modify( '-2 hours' ),
+			$now->modify( '-1 hours' ),
+			$attendee_ids,
+		);
+	}
+
+	public function create_inactive_future( array $attendee_ids = array() ): int {
+		$now = new DateTimeImmutable( 'now', new DateTimeZone( 'UTC' ) );
+
+		return $this->create_event(
+			$now->modify( '+1 hours' ),
+			$now->modify( '+2 hours' ),
+			$attendee_ids,
+		);
+	}
+
+	private function create_event( DateTimeImmutable $start, DateTimeImmutable $end, array $attendee_ids ): int {
+		$event_id = $this->create();
+		$meta_key = Route::USER_META_KEY_ATTENDING;
+
+		$user_id = get_current_user_id();
+		if ( ! in_array( $user_id, $attendee_ids, true ) ) {
+			// The current user will have been added as attending the event, but it was not specified as an attendee by
+			// the caller of this function. So we remove the current user as attendee.
+			$event_ids = get_user_meta( $user_id, $meta_key, true );
+			unset( $event_ids[ $event_id ] );
+			update_user_meta( $user_id, $meta_key, array() );
+		}
+
+		update_post_meta( $event_id, '_event_start', $start->format( 'Y-m-d H:i:s' ) );
+		update_post_meta( $event_id, '_event_end', $end->format( 'Y-m-d H:i:s' ) );
+		update_post_meta( $event_id, '_event_timezone', 'Europe/Lisbon' );
+
+		foreach ( $attendee_ids as $user_id ) {
+			$event_ids   = get_user_meta( $user_id, $meta_key, true ) ?: array();
+			$event_ids[] = $event_id;
+			update_user_meta( $user_id, $meta_key, $event_ids );
+		}
+
+		return $event_id;
+	}
+}
diff --git a/tests/lib/translation-factory.php b/tests/lib/translation-factory.php
new file mode 100644
index 00000000..c1ad71fa
--- /dev/null
+++ b/tests/lib/translation-factory.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Wporg\TranslationEvents\Tests;
+
+use GP_UnitTest_Factory;
+
+class Translation_Factory {
+	private GP_UnitTest_Factory $gp_factory;
+	private $set;
+
+	public function __construct( GP_UnitTest_Factory $gp_factory ) {
+		$this->gp_factory = $gp_factory;
+		$this->set        = $this->gp_factory->translation_set->create_with_project_and_locale();
+	}
+
+	public function create( int $user_id ) {
+		$original = $this->gp_factory->original->create(
+			array(
+				'project_id' => $this->set->project->id,
+				'status'     => '+active',
+				'singular'   => 'foo',
+			)
+		);
+
+		return $this->gp_factory->translation->create(
+			array(
+				'user_id'            => $user_id,
+				'translation_set_id' => $this->set->id,
+				'original_id'        => $original->id,
+				'status'             => 'waiting',
+			)
+		);
+	}
+}
diff --git a/tests/stats-listener.php b/tests/stats-listener.php
new file mode 100644
index 00000000..d0b6a8cc
--- /dev/null
+++ b/tests/stats-listener.php
@@ -0,0 +1,207 @@
+<?php
+
+namespace Wporg\Tests;
+
+use GP_Translation;
+use GP_UnitTestCase;
+use Wporg\TranslationEvents\Tests\Event_Factory;
+use Wporg\TranslationEvents\Tests\Translation_Factory;
+
+class Stats_Listener_Test extends GP_UnitTestCase {
+	private Translation_Factory $translation_factory;
+	private Event_Factory $event_factory;
+
+	public function setUp(): void {
+		parent::setUp();
+		$this->translation_factory = new Translation_Factory( $this->factory );
+		$this->event_factory       = new Event_Factory();
+	}
+
+	private function get_stats(): array {
+		global $wpdb;
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching
+		return $wpdb->get_results( 'select * from wp_wporg_gp_translation_events_actions', ARRAY_A );
+		// phpcs:enable
+	}
+
+	private function clean_stats() {
+		global $wpdb;
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery
+		// phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching
+		$wpdb->query( 'delete from wp_wporg_gp_translation_events_actions' );
+		// phpcs:enable
+	}
+
+	public function test_does_not_store_action_for_draft_events() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$this->event_factory->create_draft();
+		$this->event_factory->create_draft();
+
+		$this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertEmpty( $stats );
+	}
+
+	public function test_does_not_store_action_for_inactive_events() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$this->event_factory->create_inactive_past( array( $user_id ) );
+		$this->event_factory->create_inactive_future( array( $user_id ) );
+
+		$this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertEmpty( $stats );
+	}
+
+	public function test_does_not_store_action_if_user_not_attending() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$this->event_factory->create_active();
+		$this->event_factory->create_active();
+
+		$this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertEmpty( $stats );
+	}
+
+	public function test_stores_action_create() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$event1_id = $this->event_factory->create_active( array( $user_id ) );
+		$event2_id = $this->event_factory->create_active( array( $user_id ) );
+
+		$translation = $this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertCount( 2, $stats );
+
+		$event1_stats = $stats[0];
+		$this->assertEquals( $event1_id, $event1_stats['event_id'] );
+		$this->assertEquals( $user_id, $event1_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event1_stats['translation_id'] );
+		$this->assertEquals( 'create', $event1_stats['action'] );
+		$this->assertEquals( 'aa', $event1_stats['locale'] );
+
+		$event2_stats = $stats[1];
+		$this->assertEquals( $event2_id, $event2_stats['event_id'] );
+		$this->assertEquals( $user_id, $event2_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event2_stats['translation_id'] );
+		$this->assertEquals( 'create', $event2_stats['action'] );
+		$this->assertEquals( 'aa', $event2_stats['locale'] );
+	}
+
+	public function test_stores_action_approve() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$event1_id = $this->event_factory->create_active( array( $user_id ) );
+		$event2_id = $this->event_factory->create_active( array( $user_id ) );
+
+		/** @var GP_Translation $translation */
+		$translation = $this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+		// Clean up stats because we won't care about the "created" action.
+		$this->clean_stats();
+
+		$translation->set_as_current();
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertCount( 2, $stats );
+
+		$event1_stats = $stats[0];
+		$this->assertEquals( $event1_id, $event1_stats['event_id'] );
+		$this->assertEquals( $user_id, $event1_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event1_stats['translation_id'] );
+		$this->assertEquals( 'approve', $event1_stats['action'] );
+		$this->assertEquals( 'aa', $event1_stats['locale'] );
+
+		$event2_stats = $stats[1];
+		$this->assertEquals( $event2_id, $event2_stats['event_id'] );
+		$this->assertEquals( $user_id, $event2_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event2_stats['translation_id'] );
+		$this->assertEquals( 'approve', $event2_stats['action'] );
+		$this->assertEquals( 'aa', $event2_stats['locale'] );
+	}
+
+	public function test_stores_action_reject() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$event1_id = $this->event_factory->create_active( array( $user_id ) );
+		$event2_id = $this->event_factory->create_active( array( $user_id ) );
+
+		/** @var GP_Translation $translation */
+		$translation = $this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+		// Clean up stats because we won't care about the "created" action.
+		$this->clean_stats();
+
+		$translation->reject();
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertCount( 2, $stats );
+
+		$event1_stats = $stats[0];
+		$this->assertEquals( $event1_id, $event1_stats['event_id'] );
+		$this->assertEquals( $user_id, $event1_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event1_stats['translation_id'] );
+		$this->assertEquals( 'reject', $event1_stats['action'] );
+		$this->assertEquals( 'aa', $event1_stats['locale'] );
+
+		$event2_stats = $stats[1];
+		$this->assertEquals( $event2_id, $event2_stats['event_id'] );
+		$this->assertEquals( $user_id, $event2_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event2_stats['translation_id'] );
+		$this->assertEquals( 'reject', $event2_stats['action'] );
+		$this->assertEquals( 'aa', $event2_stats['locale'] );
+	}
+
+	public function test_stores_action_request_changes() {
+		$this->set_normal_user_as_current();
+		$user_id = wp_get_current_user()->ID;
+
+		$event1_id = $this->event_factory->create_active( array( $user_id ) );
+		$event2_id = $this->event_factory->create_active( array( $user_id ) );
+
+		/** @var GP_Translation $translation */
+		$translation = $this->translation_factory->create( $user_id );
+		// Stats_Listener will have been called.
+		// Clean up stats because we won't care about the "created" action.
+		$this->clean_stats();
+
+		$translation->set_as_changesrequested();
+		// Stats_Listener will have been called.
+
+		$stats = $this->get_stats();
+		$this->assertCount( 2, $stats );
+
+		$event1_stats = $stats[0];
+		$this->assertEquals( $event1_id, $event1_stats['event_id'] );
+		$this->assertEquals( $user_id, $event1_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event1_stats['translation_id'] );
+		$this->assertEquals( 'request_changes', $event1_stats['action'] );
+		$this->assertEquals( 'aa', $event1_stats['locale'] );
+
+		$event2_stats = $stats[1];
+		$this->assertEquals( $event2_id, $event2_stats['event_id'] );
+		$this->assertEquals( $user_id, $event2_stats['user_id'] );
+		$this->assertEquals( $translation->id, $event2_stats['translation_id'] );
+		$this->assertEquals( 'request_changes', $event2_stats['action'] );
+		$this->assertEquals( 'aa', $event2_stats['locale'] );
+	}
+}
diff --git a/tests/unit/dummy.php b/tests/unit/dummy.php
deleted file mode 100644
index 671fbf68..00000000
--- a/tests/unit/dummy.php
+++ /dev/null
@@ -1,14 +0,0 @@
-<?php
-
-namespace Wporg\TranslationEvents\Tests;
-
-use WP_UnitTestCase;
-
-/**
- * TODO: Remove this file once there are actual tests.
- */
-class DummyTest extends WP_UnitTestCase {
-	public function test_dummy() {
-		$this->assertTrue( true );
-	}
-}
diff --git a/wporg-gp-translation-events.php b/wporg-gp-translation-events.php
index d566fc47..698c72fa 100644
--- a/wporg-gp-translation-events.php
+++ b/wporg-gp-translation-events.php
@@ -392,7 +392,7 @@ function () {
 		require_once __DIR__ . '/includes/event.php';
 		require_once __DIR__ . '/includes/route.php';
 		require_once __DIR__ . '/includes/stats-calculator.php';
-		require_once __DIR__ . '/includes/translation-listener.php';
+		require_once __DIR__ . '/includes/stats-listener.php';
 
 		GP::$router->add( '/events?', array( 'Wporg\TranslationEvents\Route', 'events_list' ) );
 		GP::$router->add( '/events/new', array( 'Wporg\TranslationEvents\Route', 'events_create' ) );
@@ -401,9 +401,9 @@ function () {
 		GP::$router->add( '/events/my-events', array( 'Wporg\TranslationEvents\Route', 'events_user_created' ) );
 		GP::$router->add( '/events/([a-z0-9_-]+)', array( 'Wporg\TranslationEvents\Route', 'events_details' ) );
 
-		$active_events_cache                  = new Active_Events_Cache();
-		$wporg_gp_translation_events_listener = new Translation_Listener( $active_events_cache );
-		$wporg_gp_translation_events_listener->start();
+		$active_events_cache = new Active_Events_Cache();
+		$stats_listener      = new Stats_Listener( $active_events_cache );
+		$stats_listener->start();
 	}
 );