List of Classes and Methods of org.mockitousage.bugs.creation package of Mockito Framework

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Why is using static helper methods in Java bad?

Is it correct to isolate a unit test at method level and stub internal method calls?

Mocking static methods with Mockito

Mockito - verify a double value

Creating a new instance of a bean after each unit test

How can I make a Mockito mock perform different actions in sequence?

How to fix this error: java.lang.NoSuchMethodError: 'java.lang.AutoCloseable org.mockito.MockitoAnnotations.openMocks(java.lang.Object)'

Mockito: using a method in "thenReturn" to return a mock doesn't work

Is there a way of having something like jUnit Assert message argument in Mockito's verify method?

org.mockito.exceptions.misusing.InvalidUseOfMatchersException for valid expression

The problem with static methods is they're very hard to fake when they're not relevant to the system you're trying to test. Imagine this code:

public void systemUnderTest() {
    Log.connectToDatabaseForAuditing();
    doLogicYouWantToTest();
}

The connectToDatabaseForAuditing() method is static. You don't care what this method does for the test you want to write. But, to test this code now you need an available database.

If it were not static the code would look like this:

private Logger log; //instantiate in a setter AKA dependency injection/inversion of control

public void systemUnderTest() {
    log.connectToDatabaseForAuditing();
    doLogicYouWantToTest();
}

And your test would be trivial to write without a database now:

@Before
public void setUp() {
    YourClass yourClass = new YourClass();
    yourClass.setLog(new NoOpLogger());

}

//.. your tests

Imagine trying to do that when the method is static. I can't really think of a way except for modifying the logger to have a static variable called inTestMode that you set to true in the setUp() to make sure it doesn't connect to a database.

https://stackoverflow.com/questions/14387385/why-is-using-static-helper-methods-in-java-bad

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