Enhancement/#11643 - Add amp mode to Google Proxy features request

includes/Core/Authentication/Google_Proxy.php

@@ -524,6 +524,7 @@ public function exchange_site_code( $site_code, $undelegated_code ) {
 	 *
 	 * @since 1.27.0
 	 * @since 1.104.0 Added `php_version` to request.
+	 * @since n.e.x.t Added `amp_mode` to request.
 	 *
 	 * @param Credentials $credentials Credentials instance.
 	 * @return array|WP_Error Response of the wp_remote_post request.
@@ -534,6 +535,7 @@ public function get_features( Credentials $credentials ) {
 		$platform               = self::get_platform();
 		$user_count             = count_users();
 		$connectable_user_count = isset( $user_count['avail_roles']['administrator'] ) ? $user_count['avail_roles']['administrator'] : 0;
+		$amp_mode               = $this->context->get_amp_mode();
 
 		$body = array(
 			'platform'               => $platform . '/google-site-kit',
@@ -543,6 +545,7 @@ public function get_features( Credentials $credentials ) {
 			'user_count'             => $user_count['total_users'],
 			'connectable_user_count' => $connectable_user_count,
 			'connected_user_count'   => $this->count_connected_users(),
+			'amp_mode'               => $amp_mode ? $amp_mode : '',
 		);
 
 		/**

tests/phpunit/integration/Core/Authentication/Google_ProxyTest.php

@@ -431,13 +431,45 @@ public function test_get_features() {
 				'connected_modules'      => 'site-verification search-console pagespeed-insights',
 				'php_version'            => phpversion(),
 				'feature_metrics'        => array(),
+				'amp_mode'               => '', // No AMP mode by default.
 			),
 			$this->request_args['body'],
 			'Get features request body should contain site credentials and platform information.'
 		);
 		$this->assertEqualSetsWithIndex( $expected_success_response, $features, 'Get features should return expected feature data.' );
 	}
 
+	/**
+	 * @dataProvider amp_mode_provider
+	 */
+	public function test_get_features_with_amp_mode( $amp_mode, $context_method ) {
+		// Remove the filter being added by Modules::register() or any other class during bootstrap.
+		remove_all_filters( 'googlesitekit_feature_metrics' );
+
+		list ( $credentials, $site_id, $site_secret ) = $this->get_credentials();
+
+		$context      = call_user_func( array( $this, $context_method ) );
+		$google_proxy = new Google_Proxy( $context );
+
+		$expected_url              = $google_proxy->url( Google_Proxy::FEATURES_URI );
+		$expected_success_response = array(
+			'test.featureName' => array( 'enabled' => true ),
+		);
+
+		$this->mock_http_request( $expected_url, $expected_success_response );
+		$google_proxy->get_features( $credentials, new OAuth_Client( $context, null, null, $credentials, $google_proxy ) );
+
+		// Ensure amp_mode is set to the expected value.
+		$this->assertEquals( $amp_mode, $this->request_args['body']['amp_mode'], "Get features request should include '$amp_mode' amp_mode." );
+	}
+
+	public function amp_mode_provider() {
+		return array(
+			'primary AMP mode'   => array( 'primary', 'get_amp_primary_context' ),
+			'secondary AMP mode' => array( 'secondary', 'get_amp_secondary_context' ),
+		);
+	}
+
 	public function test_count_connected_users() {
 		$context  = new Context( GOOGLESITEKIT_PLUGIN_MAIN_FILE );
 		$meta_key = ( new User_Options( $context ) )->get_meta_key( OAuth_Client::OPTION_ACCESS_TOKEN );