backend-test-utils: bring back old alpha solution

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/backend-test-utils/report-alpha.api.md

@@ -13,7 +13,6 @@ import { JsonObject } from '@backstage/types';
 import { JsonValue } from '@backstage/types';
 import { LoggerService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
-import { ServiceMock } from '@backstage/backend-test-utils';
 
 // @alpha (undocumented)
 export function actionsRegistryServiceMock(options?: {
@@ -71,5 +70,16 @@ export class MockActionsRegistry
   >(options: ActionsRegistryActionOptions<TInputSchema, TOutputSchema>): void;
 }
 
+// @public (undocumented)
+export type ServiceMock<TService> = {
+  factory: ServiceFactory<TService>;
+} & {
+  [Key in keyof TService]: TService[Key] extends (
+    ...args: infer Args
+  ) => infer Return
+    ? TService[Key] & jest.MockInstance<Return, Args>
+    : TService[Key];
+};
+
 // (No @packageDocumentation comment for this package)
 ```

packages/backend-test-utils/src/alpha/services/ActionsRegistryServiceMock.ts

@@ -16,7 +16,7 @@
 import { mockServices } from '../../services';
 import { LoggerService } from '@backstage/backend-plugin-api';
 import { MockActionsRegistry } from './MockActionsRegistry';
-import { createServiceMock } from '@backstage/backend-test-utils';
+import { createServiceMock } from './alphaCreateServiceMock';
 import { actionsRegistryServiceRef } from '@backstage/backend-plugin-api/alpha';
 import { actionsRegistryServiceFactory } from '@backstage/backend-defaults/alpha';
 

packages/backend-test-utils/src/alpha/services/ActionsServiceMock.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { createServiceMock } from '@backstage/backend-test-utils';
+import { createServiceMock } from './alphaCreateServiceMock';
 import { actionsServiceRef } from '@backstage/backend-plugin-api/alpha';
 import { actionsServiceFactory } from '@backstage/backend-defaults/alpha';
 

packages/backend-test-utils/src/alpha/services/alphaCreateServiceMock.ts

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2026 The Backstage Authors
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+export { createServiceMock } from '../../services/createServiceMock';
+
+/** @alpha */
+export type { ServiceMock } from '../../services/createServiceMock';

packages/backend-test-utils/src/alpha/services/index.ts

@@ -17,3 +17,4 @@
 export { actionsRegistryServiceMock } from './ActionsRegistryServiceMock';
 export { MockActionsRegistry } from './MockActionsRegistry';
 export { actionsServiceMock } from './ActionsServiceMock';
+export { type ServiceMock } from './alphaCreateServiceMock';