CODEWITHSUNDEEP
javaandroidunit-testingmockingmockito
j2emanue
j2emanue

Reputation: 62519

Mockito - what does verify method do?

Let's say i have the following psuedo like test code: 

 //Let's import Mockito statically so that the code looks clearer
 import static org.mockito.Mockito.*;

 //mock creation
 List mockedList = mock(List.class);

 //using mock object
 mockedList.add("one");
 mockedList.clear();

 //what do these two verify methods do ?
 verify(mockedList).add("one");
 verify(mockedList).clear();

I keep showing the test passed but i dont know what the verify means ? what is it verifying exactly ? I understand that i mocked a call to add and clear but what does the two verify calls do ?

Upvotes: 41

Views: 18923

Answers (3)

kinbiko
kinbiko

Reputation: 2145

Mockito.verify(MockedObject).someMethodOnTheObject(someParametersToTheMethod); verifies that the methods you called on your mocked object are indeed called only once. If they weren't called, or called with the wrong parameters, or called the wrong number of times, they would fail your test.

Upvotes: 44

Willem van der Veen
Willem van der Veen

Reputation: 36580

The verify() method in Mockito is used to check if a method of an object was called. It is used to make sure that the method was called with certain parameters, the number of times it was called, etc.

// Example:

// Create a mock object of a class 
MyClass mockClass = Mockito.mock(MyClass.class); 

// Call a method on the mock object 
mockClass.doSomething(); 

// Verify that the doSomething() method was called 
Mockito.verify(mockClass).doSomething();

Upvotes: 0

weston
weston

Reputation: 54781

It asserts that the method was called, and with those arguments.

Comment out:

//mockedList.add("one");

Or change its argument and the test will fail.

Upvotes: 11

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