Mocks Vs Stub

 

Test Doubles --> Mocks (mock, spy)   &    Stub (stub, dummy, fake)

Mock

• Waits to be called by the class under Test.

• Mock object are used for behaviour verification.

• Mock can fail the test.

• It can provide data and logic needed by the class.

source: internet

Stub

• Gives out data that goes under class/object under test.

• Stub object are used for state verification.

• Stub cannot fail the test, it returns stub value.

• Data is directly injected into the class.

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