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MOCKITO COOKBOOK

MOCKITO COOKBOOK

By : Grzejszczak
4.3 (4)
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MOCKITO COOKBOOK

MOCKITO COOKBOOK

4.3 (4)
By: Grzejszczak
Buy this Book

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.
Table of Contents (12 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with Mockito
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1. Getting Started with Mockito
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Introduction
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Adding Mockito to a project's classpath
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Getting started with Mockito for JUnit
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Getting started with Mockito for TestNG
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Mockito best practices – test behavior not implementation
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Adding Mockito hints to exception messages (JUnit) (Experimental)
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Adding additional Mockito warnings to your tests (JUnit) (Experimental)
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2. Creating Mocks
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2. Creating Mocks
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Introduction
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Creating mocks in code
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Creating mocks with annotations
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Creating mocks with a different default answer
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Creating mocks with different default answers with annotations
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Creating mocks with custom configuration
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Creating mocks of final classes with PowerMock
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Creating mocks of enums with PowerMock
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3. Creating Spies and Partial Mocks
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3. Creating Spies and Partial Mocks
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Introduction
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Creating spies in code
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Creating spies with custom configuration
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Creating spies using annotations
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Creating partial mocks
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Creating partial mocks of final classes with delegatesTo()
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Creating spies of final classes with PowerMock
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4. Stubbing Behavior of Mocks
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4. Stubbing Behavior of Mocks
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Introduction
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Using argument matchers for stubbing
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Stubbing methods that return values
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Stubbing methods so that they throw exceptions
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Stubbing methods so that they return custom answers
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Stubbing methods so that they call real methods
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Stubbing void methods
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Stubbing void methods so that they throw exceptions
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Stubbing void methods so that they return custom answers
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Stubbing void methods so that they call real methods
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Stubbing final methods with PowerMock
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Stubbing static methods with PowerMock
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Stubbing object instantiation using PowerMock
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5. Stubbing Behavior of Spies
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5. Stubbing Behavior of Spies
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Introduction
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Stubbing methods that return values
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Stubbing methods so that they throw exceptions
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Stubbing methods so that they return custom answers
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Stubbing void methods
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Stubbing void methods so that they throw exceptions
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Stubbing void methods so that they return custom answers
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Stubbing final methods with PowerMock
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6. Verifying Test Doubles
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6. Verifying Test Doubles
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Introduction
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Verifying the method invocation count with times()
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Verifying the method invocation count with atLeast()
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Verifying the method invocation count with atMost()
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Verifying that interactions never happened
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Verifying that interactions stopped happening
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Verifying the order of interactions
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Verifying interactions and ignoring stubbed methods
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Verifying the method invocation within the specified time
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7. Verifying Behavior with Object Matchers
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7. Verifying Behavior with Object Matchers
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Introduction
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Using Hamcrest matchers for assertions
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Creating custom Hamcrest matchers
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Using Hamcrest matchers for stubbing and verification
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Using AssertJ for assertions
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Creating custom AssertJ assertions
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Capturing and asserting the argument
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8. Refactoring with Mockito
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8. Refactoring with Mockito
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Introduction
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Removing the problems with instance creation
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Refactoring classes that do too much
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Refactoring the classes that use the class casts
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Refactoring the classes that use static methods
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Refactoring the tests that use too many mocks
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9. Integration Testing with Mockito and DI Frameworks
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9. Integration Testing with Mockito and DI Frameworks
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Introduction
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Injecting test doubles instead of beans using Spring's code configuration
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Injecting test doubles instead of beans using Spring's XML configuration
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Injecting test doubles instead of beans using Springockito
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Injecting test doubles instead of beans with Guice
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Injecting test doubles instead of beans with Guice using Jukito
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10. Mocking Libraries Comparison
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10. Mocking Libraries Comparison
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Introduction
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Mockito versus EasyMock
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Mockito versus JMockit
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Mockito versus JMock
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Mockito versus Spock
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Index
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Index

Stubbing void methods so that they throw exceptions

In this recipe, we will stub a void method that doesn't return a value, so it throws an exception.

Getting ready

For this recipe, our system under test will be a PersonProcessor class that, for simplicity, does only one thing: it delegates the process of saving person to the PersonSaver class. As shown in the following code, in case of success, true is returned; otherwise, false is returned:

public class PersonProcessor {

    private final PersonSaver personSaver;

    public PersonProcessor(PersonSaver personSaver) {
        this.personSaver = personSaver;
    }

    public boolean process(Person person) {
        try {
            personSaver.savePerson(person);
            return true;
        } catch (FailedToSavedPersonDataException e) {
            System.err.printf("Exception occurred while trying save person data [%s]%n", e);
            return false;
        }
    }

}
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How to do it...

If you want your void method to throw an exception...

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Understand complex code with line-by-line explanations. Quickly enhance your coding skills.