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MOCKITO COOKBOOK

By : Grzejszczak

4.3 (4)

MOCKITO COOKBOOK

4.3 (4)

By: Grzejszczak

Overview of this book

This is a focused guide with lots of practical recipes with presentations of business issues and presentation of the whole test of the system. This book shows the use of Mockito's popular unit testing frameworks such as JUnit, PowerMock, TestNG, and so on. If you are a software developer with no testing experience (especially with Mockito) and you want to start using Mockito in the most efficient way then this book is for you. This book assumes that you have a good knowledge level and understanding of Java-based unit testing frameworks.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Mockito

1. Getting Started with Mockito

Introduction

Adding Mockito to a project's classpath

Getting started with Mockito for JUnit

Getting started with Mockito for TestNG

Mockito best practices – test behavior not implementation

Adding Mockito hints to exception messages (JUnit) (Experimental)

Adding additional Mockito warnings to your tests (JUnit) (Experimental)

2. Creating Mocks

2. Creating Mocks

Introduction

Creating mocks in code

Creating mocks with annotations

Creating mocks with a different default answer

Creating mocks with different default answers with annotations

Creating mocks with custom configuration

Creating mocks of final classes with PowerMock

Creating mocks of enums with PowerMock

3. Creating Spies and Partial Mocks

3. Creating Spies and Partial Mocks

Introduction

Creating spies in code

Creating spies with custom configuration

Creating spies using annotations

Creating partial mocks

Creating partial mocks of final classes with delegatesTo()

Creating spies of final classes with PowerMock

4. Stubbing Behavior of Mocks

4. Stubbing Behavior of Mocks

Introduction

Using argument matchers for stubbing

Stubbing methods that return values

Stubbing methods so that they throw exceptions

Stubbing methods so that they return custom answers

Stubbing methods so that they call real methods

Stubbing void methods

Stubbing void methods so that they throw exceptions

Stubbing void methods so that they return custom answers

Stubbing void methods so that they call real methods

Stubbing final methods with PowerMock

Stubbing static methods with PowerMock

Stubbing object instantiation using PowerMock

5. Stubbing Behavior of Spies

5. Stubbing Behavior of Spies

Introduction

Stubbing methods that return values

Stubbing methods so that they throw exceptions

Stubbing methods so that they return custom answers

Stubbing void methods

Stubbing void methods so that they throw exceptions

Stubbing void methods so that they return custom answers

Stubbing final methods with PowerMock

6. Verifying Test Doubles

6. Verifying Test Doubles

Introduction

Verifying the method invocation count with times()

Verifying the method invocation count with atLeast()

Verifying the method invocation count with atMost()

Verifying that interactions never happened

Verifying that interactions stopped happening

Verifying the order of interactions

Verifying interactions and ignoring stubbed methods

Verifying the method invocation within the specified time

7. Verifying Behavior with Object Matchers

7. Verifying Behavior with Object Matchers

Introduction

Using Hamcrest matchers for assertions

Creating custom Hamcrest matchers

Using Hamcrest matchers for stubbing and verification

Using AssertJ for assertions

Creating custom AssertJ assertions

Capturing and asserting the argument

8. Refactoring with Mockito

8. Refactoring with Mockito

Introduction

Removing the problems with instance creation

Refactoring classes that do too much

Refactoring the classes that use the class casts

Refactoring the classes that use static methods

Refactoring the tests that use too many mocks

9. Integration Testing with Mockito and DI Frameworks

9. Integration Testing with Mockito and DI Frameworks

Introduction

Injecting test doubles instead of beans using Spring's code configuration

Injecting test doubles instead of beans using Spring's XML configuration

Injecting test doubles instead of beans using Springockito

Injecting test doubles instead of beans with Guice

Injecting test doubles instead of beans with Guice using Jukito

10. Mocking Libraries Comparison

10. Mocking Libraries Comparison

Introduction

Mockito versus EasyMock

Mockito versus JMockit

Mockito versus JMock

Mockito versus Spock

Index

Index

Adding Mockito to a project's classpath

Adding Mockito to a project's classpath is as simple as adding one of the two jars to your project's classpath:

mockito-all: This is a single jar with all dependencies (with the hamcrest and objenesis libraries—as of June 2011).
mockito-core: This is only Mockito core (without hamcrest or objenesis). Use this if you want to control which version of hamcrest or objenesis is used.

How to do it...

If you are using a dependency manager that connects to the Maven Central Repository, then you can get your dependencies as follows (examples of how to add mockito-all to your classpath for Maven and Gradle):

For Maven, use the following code:

        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.9.5</version>
            <scope>test</scope>
        </dependency>

For Gradle, use the following code:

testCompile "org.mockito:mockito-all:1.9.5"

Tip

Downloading the example code

You can download the example code files for all Packt books you have purchased from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

If you are not using any of the dependency managers, you have to either download mockito-all.jar or mockito-core.jar and add it to your classpath manually (you can download the jars from https://code.google.com/p/mockito/downloads/list). To see more examples of adding Mockito to your classpath, please check the book, Instant Mockito, Marcin Grzejszczak, Packt Publishing, for more examples of adding Mockito to your classpath (it includes Ant, Buildr, Sbt, Ivy, Gradle, and Maven).

See also

Refer to Instant Mockito, Marcin Grzejszczak, Packt Publishing for an introduction to Mockito together with examples of Mockito configuration in several build tools at http://www.packtpub.com/how-to-create-stubs-mocks-spies-using-mockito/book

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