diff --git a/.changeset/famous-badgers-drop.md b/.changeset/famous-badgers-drop.md
new file mode 100644
index 0000000000..af519cf964
--- /dev/null
+++ b/.changeset/famous-badgers-drop.md
@@ -0,0 +1,5 @@
+---
+'@backstage/backend-test-utils': patch
+---
+
+Added missing service mock for `mockServices.rootConfig.mock`, and fixed the definition of `mockServices.rootHttpRouter.factory` to not have a duplicate callback.
diff --git a/packages/backend-test-utils/api-report.md b/packages/backend-test-utils/api-report.md
index 91dd806e44..2bea998596 100644
--- a/packages/backend-test-utils/api-report.md
+++ b/packages/backend-test-utils/api-report.md
@@ -36,7 +36,6 @@ import { ParsedQs } from 'qs';
 import { PermissionsService } from '@backstage/backend-plugin-api';
 import { RootConfigService } from '@backstage/backend-plugin-api';
 import { RootHealthService } from '@backstage/backend-plugin-api';
-import { RootHttpRouterFactoryOptions } from '@backstage/backend-defaults/rootHttpRouter';
 import { RootHttpRouterService } from '@backstage/backend-plugin-api';
 import { RootLifecycleService } from '@backstage/backend-plugin-api';
 import { RootLoggerService } from '@backstage/backend-plugin-api';
@@ -267,6 +266,10 @@ export namespace mockServices {
       factory: (
         options?: Options | undefined,
       ) => ServiceFactory<RootConfigService, 'root', 'singleton' | 'multiton'>;
+    const // (undocumented)
+      mock: (
+        partialImpl?: Partial<RootConfigService> | undefined,
+      ) => ServiceMock<RootConfigService>;
   }
   // (undocumented)
   export namespace rootHealth {
@@ -280,10 +283,7 @@ export namespace mockServices {
   // (undocumented)
   export namespace rootHttpRouter {
     const // (undocumented)
-      factory: () => ((
-        options?: RootHttpRouterFactoryOptions | undefined,
-      ) => ServiceFactory<RootHttpRouterService, 'root', 'singleton'>) &
-        ServiceFactory<RootHttpRouterService, 'root', 'singleton'>;
+      factory: () => ServiceFactory<RootHttpRouterService, 'root', 'singleton'>;
     const // (undocumented)
       mock: (
         partialImpl?: Partial<RootHttpRouterService> | undefined,
diff --git a/packages/backend-test-utils/src/next/services/mockServices.test.ts b/packages/backend-test-utils/src/next/services/mockServices.test.ts
index d60111f258..80d6e4c6f1 100644
--- a/packages/backend-test-utils/src/next/services/mockServices.test.ts
+++ b/packages/backend-test-utils/src/next/services/mockServices.test.ts
@@ -18,13 +18,15 @@ import { coreServices } from '@backstage/backend-plugin-api';
 import { mockServices } from './mockServices';
 
 describe('mockServices', () => {
-  it('should have mock implementations for all core services', () => {
-    const mockServiceKeys = Object.keys(mockServices);
-    for (const key of Object.keys(coreServices)) {
-      if (key === 'pluginMetadata') {
-        continue;
-      }
-      expect(mockServiceKeys).toContain(key);
-    }
+  const coreServiceKeys = Object.keys(coreServices).filter(
+    key => key !== 'pluginMetadata',
+  ) as Array<keyof typeof mockServices>;
+
+  it.each(coreServiceKeys)('should have mock implementations for %s', key => {
+    expect(mockServices[key]).toBeDefined();
+    expect(mockServices[key].mock).toEqual(expect.any(Function));
+    expect(mockServices[key].mock()).toEqual(expect.any(Object));
+    expect(mockServices[key].factory).toEqual(expect.any(Function));
+    expect(mockServices[key].factory()).toEqual(expect.any(Object));
   });
 });
diff --git a/packages/backend-test-utils/src/next/services/mockServices.ts b/packages/backend-test-utils/src/next/services/mockServices.ts
index d3ec8fb18d..8b0f196399 100644
--- a/packages/backend-test-utils/src/next/services/mockServices.ts
+++ b/packages/backend-test-utils/src/next/services/mockServices.ts
@@ -141,6 +141,24 @@ export namespace mockServices {
       coreServices.rootConfig,
       rootConfig,
     );
+    export const mock = simpleMock(coreServices.rootConfig, () => ({
+      get: jest.fn(),
+      getBoolean: jest.fn(),
+      getConfig: jest.fn(),
+      getConfigArray: jest.fn(),
+      getNumber: jest.fn(),
+      getOptional: jest.fn(),
+      getOptionalBoolean: jest.fn(),
+      getOptionalConfig: jest.fn(),
+      getOptionalConfigArray: jest.fn(),
+      getOptionalNumber: jest.fn(),
+      getOptionalString: jest.fn(),
+      getOptionalStringArray: jest.fn(),
+      getString: jest.fn(),
+      getStringArray: jest.fn(),
+      has: jest.fn(),
+      keys: jest.fn(),
+    }));
   }
 
   export function rootLogger(options?: rootLogger.Options): LoggerService {
@@ -341,7 +359,7 @@ export namespace mockServices {
   }
 
   export namespace rootHttpRouter {
-    export const factory = () => rootHttpRouterServiceFactory;
+    export const factory = () => rootHttpRouterServiceFactory();
     export const mock = simpleMock(coreServices.rootHttpRouter, () => ({
       use: jest.fn(),
     }));