Interaction verification

Interaction verification is completely different from result and state verification. With this technique, we will be checking whether an interaction under a specific condition has happened or not.

Consider the example below, the databaseManager module offers a function to close database, but it neither returns any result nor changes the state. All this function does is that it calls a function in database module.

module databaseManager

function close():

So, the only thing we can do to verify the correctness of this function is to check whether it calls close() function in database module or not

function test_close():
    // arrange
    mockDatabase = mock(database)
    database = mockDatabase

    // act

    // assert

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