book

MOCKITO COOKBOOK

Name: MOCKITO COOKBOOK
Author: Marcin Grzejszczak
ISBN: 9781783982745

by Marcin Grzejszczak

June 2014

Intermediate to advanced

284 pages

6h 9m

English

Packt Publishing

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Mockito Cookbook
Table of Contents
Mockito Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Support files, eBooks, discount offers and moreWhy Subscribe?Free Access for Packt account holders
Preface
What this book covers
What you need for this book
Who this book is for

Conventions
Reader feedback
Customer support
Downloading the example codeErrataPiracyQuestions
1. Getting Started with Mockito
Introduction
Adding Mockito to a project's classpath
How to do it...See also
Getting started with Mockito for JUnit
Getting readyHow to do it...How it works...There's more...See also
Getting started with Mockito for TestNG
Getting readyHow to do it...How it works...See also
Mockito best practices – test behavior not implementation
Getting readyHow to do it...See also
Adding Mockito hints to exception messages (JUnit) (Experimental)
Getting readyHow to do it...How it works...
Adding additional Mockito warnings to your tests (JUnit) (Experimental)
How to do it...How it works...
2. Creating Mocks
Introduction
Creating mocks in code
Getting readyHow to do it...How it works...See also
Creating mocks with annotations
Getting readyHow to do it...How it works...See also
Creating mocks with a different default answer
Getting readyHow to do it...How it works...There's more...See also
Creating mocks with different default answers with annotations
Getting readyHow to do it...How it works...See also
Creating mocks with custom configuration
Getting readyHow to do it...How it works...There's more...See also
Creating mocks of final classes with PowerMock
Getting readyHow to do it...How it works...See also
Creating mocks of enums with PowerMock
Getting readyHow to do it...How it works...See also
3. Creating Spies and Partial Mocks
Introduction
Creating spies in code
Getting readyHow to do it...How it works...See also
Creating spies with custom configuration
Getting readyHow to do it...How it works...See also
Creating spies using annotations
Getting readyHow to do it...How it works...There's more...See also
Creating partial mocks
Getting readyHow to do it...How it works...There's more...See also
Creating partial mocks of final classes with delegatesTo()
Getting readyHow to do it...How it works...There's more...See also
Creating spies of final classes with PowerMock
Getting readyHow to do it...How it works...See also
4. Stubbing Behavior of Mocks
Introduction
Using argument matchers for stubbing
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods that return values
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods so that they throw exceptions
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods so that they return custom answers
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods so that they call real methods
Getting readyHow to do it...See also
Stubbing void methods
How to do it...How it works...See also
Stubbing void methods so that they throw exceptions
Getting readyHow to do it...How it works...See also
Stubbing void methods so that they return custom answers
Getting readyHow to do it...How it works...See also
Stubbing void methods so that they call real methods
Getting readyHow to do it...How it works...See also
Stubbing final methods with PowerMock
Getting readyHow to do it...How it works...See also
Stubbing static methods with PowerMock
Getting readyHow to do it...How it works...See also
Stubbing object instantiation using PowerMock
Getting readyHow to do it...How it works...See also
5. Stubbing Behavior of Spies
Introduction
Stubbing methods that return values
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods so that they throw exceptions
Getting readyHow to do it...How it works...There's more...See also
Stubbing methods so that they return custom answers
Getting readyHow to do it...How it works...There's more...See also
Stubbing void methods
Getting readyHow to do it...How it works...There's more...See also
Stubbing void methods so that they throw exceptions
Getting readyHow to do it...How it works...See also
Stubbing void methods so that they return custom answers
Getting readyHow to do it...How it works...See also
Stubbing final methods with PowerMock
Getting readyHow to do it...How it works...See also
6. Verifying Test Doubles
Introduction
Verifying the method invocation count with times()
Getting readyHow to do it...How it works...There's more...See also
Verifying the method invocation count with atLeast()
Getting readyHow to do it...How it works...There's more...See also
Verifying the method invocation count with atMost()
Getting readyHow to do it...How it works...See also
Verifying that interactions never happened
Getting readyHow to do it...How it works...There's more...See also
Verifying that interactions stopped happening
Getting readyHow to do it...How it works...There's more...See also
Verifying the order of interactions
Getting readyHow to do it...How it works...There's more...See also
Verifying interactions and ignoring stubbed methods
Getting readyHow to do it…How it works...See also
Verifying the method invocation within the specified time
Getting readyHow to do it…How it works...There's more...See also
7. Verifying Behavior with Object Matchers
Introduction
Using Hamcrest matchers for assertions
Getting readyHow to do it...How it works...There's more...See also
Creating custom Hamcrest matchers
Getting readyHow to do it...How it works...There's more...See also
Using Hamcrest matchers for stubbing and verification
Getting readyHow to do it...How it works...There's more...See also
Using AssertJ for assertions
Getting readyHow to do it...How it works...There's more...See also
Creating custom AssertJ assertions
Getting readyHow to do it...How it works...There's more...See also
Capturing and asserting the argument
Getting readyHow to do it...How it works...See also
8. Refactoring with Mockito
Introduction
Removing the problems with instance creation
Getting readyHow to do it...How it works...There's more...See also
Refactoring classes that do too much
Getting readyHow to do it...See also
Refactoring the classes that use the class casts
Getting readyHow to do it...See also
Refactoring the classes that use static methods
Getting readyHow to do it...See also
Refactoring the tests that use too many mocks
Getting readyHow to do it...How it works..There's more…See also
9. Integration Testing with Mockito and DI Frameworks
Introduction
Injecting test doubles instead of beans using Spring's code configuration
Getting readyHow to do it...How it works...There's more...See also
Injecting test doubles instead of beans using Spring's XML configuration
Getting readyHow to do it...How it works...See also
Injecting test doubles instead of beans using Springockito
Getting readyHow to do it...How it works...There's more...See also
Injecting test doubles instead of beans with Guice
Getting readyHow to do it...How it works...See also
Injecting test doubles instead of beans with Guice using Jukito
Getting readyHow to do it...How it works...There's more...See also
10. Mocking Libraries Comparison
Introduction
Mockito versus EasyMock
Getting readyHow to do it...How it works...There's more...See also
Mockito versus JMockit
Getting readyHow to do it...How it works...There's more...See also
Mockito versus JMock
Getting readyHow to do it...How it works...There's more...See also
Mockito versus Spock
Getting readyHow to do it...How it works...There's more...See also
Index

Content preview from MOCKITO COOKBOOK

Stubbing void methods

In this recipe, we will stub a void method that doesn't return a value. The trick with void methods is that Mockito assumes that they do nothing by default, so there is no need to explicitly stub them (although you may do it).

How to do it...

If you do not want your void method to execute logic, you need to perform the following steps:

Do nothing: Mockito stubs the method for you so that it does nothing.
Explicitly tell Mockito that the void method does nothing; for the BDD approach, call BDDMockito.willNothing().given(mock).methodToStub(), or in the standard way, call Mockito.doNothing().when(mock).methodToStub().
Regardless of the chosen approach in the given(...) or when(...) method, you have to provide the mock object (and ...

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MOCKITO COOKBOOK

by Marcin Grzejszczak

Stubbing void methods

How to do it...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.