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How to use Built-In Verification Modes of Mockito Mocking Framework

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Mockito Overview

Mockito is an open source testing framework for Java which is released under the MIT License.

The official documentation of this framework states

Mockito is a mocking framework that tastes really good. It lets you write beautiful tests with clean & simple API. Mockito doesn’t give you hangover because the tests are very readable and they produce clean verification errors.

#Using the built in Verification Modes

Mockito provides a number of convenient static methods for creating VerificationModes. These methods are available in the package org.mockito.Mockito.

#times(int)

This method will verify that the method has been call n-number of times.

@Test
public void mockito_verification_times_1() {
	// Given
		
	// When
	mockMethod.mockMethodTestPage();
		
	// Then
	verify(mockMethod, times(1)).mockMethodTestPage();		
}

Note that verify(mock) is an alias of verify(mock, times(1)).

#atLeastOnce(), atLeast(int)

This method will verify that the test was called at least the given number of times.

@Test
public void mockito_verification_atleastonce() {
	// Given
		
	// When
	mockMethod.mockMethodTestPage();
	mockMethod.mockMethodTestPage();
		
	// Then
	verify(mockMethod, atLeastOnce()).mockMethodTestPage();		
}
@Test
public void mockito_verification_atleast_2() {
	// Given
		
	// When
	mockMethod.mockMethodTestPage();
	mockMethod.mockMethodTestPage();
	mockMethod.mockMethodTestPage();
		
	// Then
	verify(mockMethod, atLeast(2)).mockMethodTestPage();		
}

#atMost(int)

This is to verify that the method has been called at most the given number of times.

@Test
public void mockito_verification_atmost_3() {
	// Given
		
	// When
	mockMethod.mockMethodTestPage();
	mockMethod.mockMethodTestPage();
		
	// Then
	verify(mockMethod, atMost(3)).mockMethodTestPage();		
}

#never()

This is to verify that the method is never used.

@Test
public void mockito_verification_never() {
	// Given
		
	// When
		
	// Then
	verify(mockMethod, never()).mockMethodTestPage();		
}

#only()

This is to verify that the method being verified was the only method of the mock called.

@Test
public void mockito_verification_only() {
	// Given
		
	// When
	mockMethod.mockMethodTestPage();
		
	// Then
	verify(mockMethod, only()).mockMethodTestPage();		
}

Note: If we have more than ONE method called in the mockMethod interface then this test will fail and produce the error description.

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