ngMocks.globalKeep

ngMocks.globalKeep marks declarations, services and tokens to be avoided from the mocking process during creating mock modules.

The best place to do that is in src/test.ts for jasmine or in src/setup-jest.ts / src/test-setup.ts for jest.

Let's mark the APP_URL token in order to be kept in mock modules.

src/test.ts

ngMocks.globalKeep(APP_URL);

src/test.spec.ts

// ...
MockModule(ModuleWithService);
// ...
const url = TestBed.inject(APP_URL);
// ...

The url is the original one.