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jasminejasmine2.0

Can I spy on a dependency to the system under test - even if it is not a direct dependency of the SUT?

My question relates to Jasmine. Say I have the following graph of dependencies in an application:

SystemUnderTest --> Dependency1 --> Dependency2 --> DependencyN

Can I spy on DependencyN even if it is not a direct dependency to the system under test (SystemUnderTest) but rather a transitive dependency (only Dependency1 is a direct dependency above)?

Solution

  • It depends. In frameworks like AngularJS or Angular2 that make use of dependency injection, mocking (or spying on methods of) a service will inject the mocked version for any other components or child components that would normally use this same service.