diff --git a/bin/setup-wp.php b/bin/setup-wp.php
index 2c389586c..62fa0f39a 100644
--- a/bin/setup-wp.php
+++ b/bin/setup-wp.php
@@ -9,7 +9,6 @@
 use lucatume\WPBrowser\WordPress\InstallationState\EmptyDir;
 use lucatume\WPBrowser\WordPress\InstallationState\InstallationStateInterface;
 use lucatume\WPBrowser\WordPress\InstallationState\Scaffolded;
-
 $dockerComposeEnvFile = escapeshellarg(dirname(__DIR__) . '/tests/.env');
 `docker compose --env-file $dockerComposeEnvFile up --wait`;
 
diff --git a/src/Template/Wpbrowser.php b/src/Template/Wpbrowser.php
index 693411849..84dfafcd9 100644
--- a/src/Template/Wpbrowser.php
+++ b/src/Template/Wpbrowser.php
@@ -127,11 +127,12 @@ private function createIntegrationSuite(ProjectInterface $project): void
     {
         $plugins = '';
         if ($project instanceof PluginProject) {
-            $plugins = "'{$project->getActivationString()}'";
+            $basename = basename($project->getActivationString());
+            $plugins = "'." . DIRECTORY_SEPARATOR . "{$basename}'";
         }
         $theme = '';
         if ($project instanceof ThemeProject) {
-            $theme = $project->getActivationString();
+            $theme = '.';
         }
 
         $suiteConfig = <<<EOF
diff --git a/tests/unit/Codeception/Template/WpbrowserTest.php b/tests/unit/Codeception/Template/WpbrowserTest.php
index ac8e1f60e..892a19590 100644
--- a/tests/unit/Codeception/Template/WpbrowserTest.php
+++ b/tests/unit/Codeception/Template/WpbrowserTest.php
@@ -325,6 +325,15 @@ public function should_scaffold_for_theme_correctly(): void
         $projectDir = FS::tmpDir('setup_', [
             'theme_23' => [
                 'style.css' => "/*\nTheme Name: Theme 23\n*/",
+                'functions.php' => <<< PHP
+                    <?php
+                    function theme_23_some_function() {
+                        return 'test-test-test';
+                    }
+
+                    add_action('after_setup_theme', 'theme_23_some_function');
+                    PHP,
+                'index.php' => '<?php // This file is required for the theme to work. ?>',
                 'composer.json' => $composerFileCode,
                 'vendor' => [
                     'bin' => [
@@ -392,9 +401,18 @@ public function should_scaffold_for_child_theme_correctly(): void
                 'style.css' => <<< EOT
 /*
 Theme Name: Theme 23
-Template: twentytwenty
+Template: twentytwentyfour
 */
 EOT,
+                'functions.php' => <<< PHP
+                    <?php
+                    function theme_23_some_function() {
+                        return 'test-test-test';
+                    }
+
+                    add_action('after_setup_theme', 'theme_23_some_function');
+                    PHP,
+                'index.php' => '<?php // This file is required for the theme to work. ?>',
                 'composer.json' => $composerFileCode,
                 'vendor' => [
                     'bin' => [
@@ -464,6 +482,15 @@ public function should_scaffold_for_theme_custom_correctly(): void
 Theme Name: Theme 23
 */
 EOT,
+                'functions.php' => <<< PHP
+                    <?php
+                    function theme_23_some_function() {
+                        return 'test-test-test';
+                    }
+
+                    add_action('after_setup_theme', 'theme_23_some_function');
+                    PHP,
+                'index.php' => '<?php // This file is required for the theme to work. ?>',
                 'composer.json' => $composerFileCode,
                 'vendor' => [
                     'bin' => [
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_child_theme_correctly__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_child_theme_correctly__0.snapshot
index 2a777b596..d3065ab51 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_child_theme_correctly__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_child_theme_correctly__0.snapshot
@@ -1,3 +1,16 @@
+>>> /functions.php >>>
+<?php
+function theme_23_some_function() {
+    return 'test-test-test';
+}
+
+add_action('after_setup_theme', 'theme_23_some_function');
+<<< /functions.php <<<
+
+>>> /index.php >>>
+<?php // This file is required for the theme to work. ?>
+<<< /index.php <<<
+
 >>> /tests/EndToEnd.suite.yml >>>
 # Integration suite configuration
 #
@@ -125,7 +138,7 @@ modules:
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
            plugins: []
-           theme: 'theme_23'
+           theme: '.'
 <<< /tests/Integration.suite.yml <<<
 
 >>> /tests/Support/IntegrationTester.php >>>
@@ -257,8 +270,8 @@ TEST_TABLE_PREFIX=test_
 WORDPRESS_TABLE_PREFIX=wp_
 
 # The URL and domain of the WordPress site used in end-to-end tests.
-WORDPRESS_URL=http://localhost:39249
-WORDPRESS_DOMAIN=localhost:39249
+WORDPRESS_URL=http://localhost:59860
+WORDPRESS_DOMAIN=localhost:59860
 WORDPRESS_ADMIN_PATH=/wp-admin
 
 # The username and password of the administrator user of the WordPress site used in end-to-end tests.
@@ -267,10 +280,10 @@ WORDPRESS_ADMIN_PASSWORD=password
 
 # The host and port of the ChromeDriver server that will be used in end-to-end tests.
 CHROMEDRIVER_HOST=localhost
-CHROMEDRIVER_PORT=43995
+CHROMEDRIVER_PORT=21551
 
 # The port on which the PHP built-in server will serve the WordPress installation.
-BUILTIN_SERVER_PORT=39249
+BUILTIN_SERVER_PORT=59860
 
 <<< /tests/.env <<<
 
@@ -328,7 +341,7 @@ extensions:
 >>> /style.css >>>
 /*
 Theme Name: Theme 23
-Template: twentytwenty
+Template: twentytwentyfour
 */
 <<< /style.css <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file__0.snapshot
index 94aa0c6c0..4e155a908 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file__0.snapshot
@@ -124,7 +124,7 @@ modules:
            domain: '%WORDPRESS_DOMAIN%'
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
-           plugins: ['plugin_89/main-file.php']
+           plugins: ['./main-file.php']
            theme: ''
 <<< /tests/Integration.suite.yml <<<
 
@@ -265,8 +265,8 @@ TEST_TABLE_PREFIX=test_
 WORDPRESS_TABLE_PREFIX=wp_
 
 # The URL and domain of the WordPress site used in end-to-end tests.
-WORDPRESS_URL=http://localhost:53890
-WORDPRESS_DOMAIN=localhost:53890
+WORDPRESS_URL=http://localhost:43626
+WORDPRESS_DOMAIN=localhost:43626
 WORDPRESS_ADMIN_PATH=/wp-admin
 
 # The username and password of the administrator user of the WordPress site used in end-to-end tests.
@@ -275,10 +275,10 @@ WORDPRESS_ADMIN_PASSWORD=password
 
 # The host and port of the ChromeDriver server that will be used in end-to-end tests.
 CHROMEDRIVER_HOST=localhost
-CHROMEDRIVER_PORT=27014
+CHROMEDRIVER_PORT=35449
 
 # The port on which the PHP built-in server will serve the WordPress installation.
-BUILTIN_SERVER_PORT=53890
+BUILTIN_SERVER_PORT=43626
 
 <<< /tests/.env <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file_custom__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file_custom__0.snapshot
index 8f0699f8f..77f9d15dd 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file_custom__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_non_plugin_php_file_custom__0.snapshot
@@ -89,7 +89,7 @@ modules:
            domain: '%WORDPRESS_DOMAIN%'
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
-           plugins: ['plugin_89/main.php']
+           plugins: ['./main.php']
            theme: ''
 <<< /tests/Integration.suite.yml <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file__0.snapshot
index 56be82bd8..28262e513 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file__0.snapshot
@@ -129,7 +129,7 @@ modules:
            domain: '%WORDPRESS_DOMAIN%'
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
-           plugins: ['plugin_89/plugin.php']
+           plugins: ['./plugin.php']
            theme: ''
 <<< /tests/Integration.suite.yml <<<
 
@@ -270,8 +270,8 @@ TEST_TABLE_PREFIX=test_
 WORDPRESS_TABLE_PREFIX=wp_
 
 # The URL and domain of the WordPress site used in end-to-end tests.
-WORDPRESS_URL=http://localhost:19501
-WORDPRESS_DOMAIN=localhost:19501
+WORDPRESS_URL=http://localhost:14326
+WORDPRESS_DOMAIN=localhost:14326
 WORDPRESS_ADMIN_PATH=/wp-admin
 
 # The username and password of the administrator user of the WordPress site used in end-to-end tests.
@@ -280,10 +280,10 @@ WORDPRESS_ADMIN_PASSWORD=password
 
 # The host and port of the ChromeDriver server that will be used in end-to-end tests.
 CHROMEDRIVER_HOST=localhost
-CHROMEDRIVER_PORT=13899
+CHROMEDRIVER_PORT=34581
 
 # The port on which the PHP built-in server will serve the WordPress installation.
-BUILTIN_SERVER_PORT=19501
+BUILTIN_SERVER_PORT=14326
 
 <<< /tests/.env <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file_custom__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file_custom__0.snapshot
index 3eb25f223..0734db2f2 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file_custom__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_plugin_with_plugin_php_file_custom__0.snapshot
@@ -89,7 +89,7 @@ modules:
            domain: '%WORDPRESS_DOMAIN%'
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
-           plugins: ['plugin_89/plugin.php']
+           plugins: ['./plugin.php']
            theme: ''
 <<< /tests/Integration.suite.yml <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_correctly__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_correctly__0.snapshot
index 82c54f0aa..7e4d61fd6 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_correctly__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_correctly__0.snapshot
@@ -1,3 +1,16 @@
+>>> /functions.php >>>
+<?php
+function theme_23_some_function() {
+    return 'test-test-test';
+}
+
+add_action('after_setup_theme', 'theme_23_some_function');
+<<< /functions.php <<<
+
+>>> /index.php >>>
+<?php // This file is required for the theme to work. ?>
+<<< /index.php <<<
+
 >>> /tests/EndToEnd.suite.yml >>>
 # Integration suite configuration
 #
@@ -125,7 +138,7 @@ modules:
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
            plugins: []
-           theme: 'theme_23'
+           theme: '.'
 <<< /tests/Integration.suite.yml <<<
 
 >>> /tests/Support/IntegrationTester.php >>>
@@ -257,8 +270,8 @@ TEST_TABLE_PREFIX=test_
 WORDPRESS_TABLE_PREFIX=wp_
 
 # The URL and domain of the WordPress site used in end-to-end tests.
-WORDPRESS_URL=http://localhost:61144
-WORDPRESS_DOMAIN=localhost:61144
+WORDPRESS_URL=http://localhost:8431
+WORDPRESS_DOMAIN=localhost:8431
 WORDPRESS_ADMIN_PATH=/wp-admin
 
 # The username and password of the administrator user of the WordPress site used in end-to-end tests.
@@ -267,10 +280,10 @@ WORDPRESS_ADMIN_PASSWORD=password
 
 # The host and port of the ChromeDriver server that will be used in end-to-end tests.
 CHROMEDRIVER_HOST=localhost
-CHROMEDRIVER_PORT=17476
+CHROMEDRIVER_PORT=44085
 
 # The port on which the PHP built-in server will serve the WordPress installation.
-BUILTIN_SERVER_PORT=61144
+BUILTIN_SERVER_PORT=8431
 
 <<< /tests/.env <<<
 
diff --git a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_custom_correctly__0.snapshot b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_custom_correctly__0.snapshot
index 6e8c18c1f..6cee5d442 100644
--- a/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_custom_correctly__0.snapshot
+++ b/tests/unit/Codeception/Template/__snapshots__/WpbrowserTest__should_scaffold_for_theme_custom_correctly__0.snapshot
@@ -1,3 +1,16 @@
+>>> /functions.php >>>
+<?php
+function theme_23_some_function() {
+    return 'test-test-test';
+}
+
+add_action('after_setup_theme', 'theme_23_some_function');
+<<< /functions.php <<<
+
+>>> /index.php >>>
+<?php // This file is required for the theme to work. ?>
+<<< /index.php <<<
+
 >>> /composer >>>
 #!/bin/sh
 touch composer.lock
@@ -92,7 +105,7 @@ modules:
            adminEmail: 'admin@%WORDPRESS_DOMAIN%'
            title: 'Integration Tests'
            plugins: []
-           theme: 'theme_23'
+           theme: '.'
 <<< /tests/Integration.suite.yml <<<
 
 >>> /tests/Support/IntegrationTester.php >>>