@@ -33,7 +33,10 @@ export async function disableFeature( feature ) {
 	return await wpApiFetch( {
 		path: 'google-site-kit/v1/e2e/feature/set-flag',
 		method: 'post',
-		data: { [ feature ]: false },
+		data: {
+			feature_name: feature,
+			feature_value: false,
+		},
 	} );
 }
 
/**
 * Enables or disables a feature flag in E2E tests.
 *
 * Site Kit by Google, Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Internal dependencies
 */
import { wpApiFetch } from './wp-api-fetch';

/**
 * Disables a feature flag during E2E tests.
 *
 * @since n.e.x.t
 *
 * @param {string} feature The feature flag to disable.
 * @return {Promise} Promise from `page.evaluate()` call.
 */
export async function disableFeature( feature ) {
	return await wpApiFetch( {
		path: 'google-site-kit/v1/e2e/feature/set-flag',
		method: 'post',
		data: { [ feature ]: false },
	} );
}

/**
 * Enables a feature flag during E2E tests.
 *
 * @since n.e.x.t
 *
 * @param {string} feature The feature flag to enable.
 * @return {Promise} Promise from `page.evaluate()` call.
 */
export async function enableFeature( feature ) {
	return await wpApiFetch( {
		path: 'google-site-kit/v1/e2e/feature/set-flag',
		method: 'post',
		data: { [ feature ]: true },
	} );
}

Nice catch. We should have probably required this to be used in the PR somehow to test  