EasyMock & PowerMock Tutorial

EasyMock is an open source testing framework to unit test Java applications. It is released under the Apache License. Where as PowerMock is an open source mocking library that extends mocking frameworks like EasyMock, Mockito. PowerMock provides two extension APIS.

         a. For EasyMock

         b. For Mockito

To use PowerMock,

         a. we require either EasyMock (or) Mockito

         b. Test frameworks like JUnit, TestNG

        

Currently PowerMock supports JUnit and TestNG. I am going to use PowerMock, EasyMock and Junit combination for this tutorial series. Most of the mocking frameworks in Java can't mock private, static and final methods. By using PowerMock, we can extend the frameworks like EasyMock and can able to mock private static methods.

I am going to use following maven dependencies.

 <dependencies>
  <!-- https://mvnrepository.com/artifact/org.easymock/easymock -->
  <dependency>
   <groupId>org.easymock</groupId>
   <artifactId>easymock</artifactId>
   <version>3.4</version>
  </dependency>

  <!-- https://mvnrepository.com/artifact/org.powermock/powermock-module-junit4 -->
  <dependency>
   <groupId>org.powermock</groupId>
   <artifactId>powermock-module-junit4</artifactId>
   <version>1.6.6</version>
  </dependency>

  <!-- https://mvnrepository.com/artifact/org.powermock/powermock-api-easymock -->
  <dependency>
   <groupId>org.powermock</groupId>
   <artifactId>powermock-api-easymock</artifactId>
   <version>1.6.6</version>
  </dependency>

 </dependencies>

Introduction

Hello World Application

Working with static methods

Mock Static Methods

Partial mocking of static methods

Mock static void method

Mock static void parameterized method

Mock static void private method

Mock static non-void private methods

Pass any argument to static method

Accept any argument of given type to static method

Working with instance methods and objects

Mock an object

Partially mock an object

Pass any object as an argument to instance method

Accept any argument of given type to instance method

Mock instance void method

Mock instance void private method

Mock instance non-void private methods

Mock instance void parameterized method

Exploring Whitebox class

Working with Whitebox class

Test private static fields of a class

Test private instance fields of a class

Get all the fields of a class 

test private instance methods

test private static methods

Get instance of a class, without invoking its constructor

access constructors

Initialize properties of an object

Initialize static properties

Get the value of instance property

Get the value of static property

Invoke instance method

Invoke static method

Invoke the constructor of a class

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