State verification

State verification is similar to result verification but rather than checking the result of SUT, we check the state of an object or something similar.

Consider an example of testing a function that closes the database connection

module databaseManager


function close():
    isOpen = false

When we call this function, it is not going to return anything, instead it is going to change the state of isOpen field

So we need to verify the state of isOpen field to ensure the correctness of close function

function test_close():
    // arrange
    databaseManager.isOpen = true

    // act

    // assert
    areEqual(false,  databaseManager.isOpen) // false is expected

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