Guides you through the creation of unit tests with JUnit and EasyMock, with detailed definitions for unit testing and mock objects. : Learn easyMock: Object Oriented Programming eBook: Virender Singh: Kindle Store. An Amazon Book with Buzz: “The Other Woman” The most . Running a Test with EasyMock It’s time to run a test case. Since you’re testing a for us to verify that it’s – Selection from Spring: A Developer’s Notebook [Book].

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Guides you through the creation of unit tests with JUnit and EasyMock, with detailed definitions for unit testing and mock objects. Unit testing and test driven development are proven ways to improve both the productivity of a developer and the quality of their software.

JUnit and EasyMock are the predominant choices for testing tools in the Java space.

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This reference card will guide you through the creation of unit tests with JUnit and EasyMock. It contains detailed definitions for unit testing and mock objects as well as a description of the lifecycle of each.

A test consists of four phases:. JUnit is a popular framework for creating unit tests for Java.

It provides a simple yet effective API for the execution of all four phases of a unit test. A test case is the basic unit of testing in JUnit and is defined vook extending junit. The TestCase class provides a series of methods that are used over the lifecycle of a test.

When creating a test case, it is required to have one or more test methods. A test method is defined by any method that fits the following criteria:. Optional lifecycle methods include public void setUp and public void tearDown.

Place test classes in the same package but different source folder as the class hook are testing. That allows the test to have access to protected methods and attributes. A JUnit test case can contain many test methods. Aesymock method identified as a test will be executed within the JUnit test lifecycle. The lifecycle consists of three pieces: All of the test methods are guaranteed to be executed.

In JUnit 4 two more phases of the lifecycle were added, beforeClass and afterClass. These methods are executed once per test class instead of once per test method as setUp and tearDown arebefore and after respectively.

Testing is about running code with a predictable set of inputs and verifying that the set of outputs you receive are as expected. JUnit is used to execute the code to be tested in an isolated manor so that those validations can be made. The second test is an example of a negative test. It tests that an error condition is handled correctly. In testBadResultsBarfoo. If it is not thrown, the test is considered a failure indicated by the fail call.

JUnit 4 added annotations to the framework and eliminated the need to extend TestCase. You can direct both the lifecycle events and other aspects of the test execution with the provided annotations. Figure 3 shows two test cases, one using JUnit 3.


A test suite is a collection of tests cases. It is used to run a collection of tests and aggregate the results. There are two ways to create a test suite, programmatically and with annotations. A test fixture is a baseline environment used for testing. For example, if the method bar is to be tested on the object foo, the test should create a new instance of foo for each test.

This will prevent any state related issues from interfering with future tests variables left initialized from previous tests, objects left with invalid data, etc. Figure 1 is an example of a fixture.

EasyMock – Wikipedia

It creates a new instance of foo for each test and closes it after the execution of each test. This prevents any carryover issues from affecting the current test. Unit testing is the testing of a component in isolation.

However,in most systems objects have many dependencies. In order to be able to test code in isolation, those dependencies need to be removed to prevent any impact on test code by the dependant code.

To create this isolation, mock objects are used to replace the real objects. EasyMock is a framework for creating mock objects using the java. When a mock object is created, a proxy object takes the place of the real object.

The proxy object gets its definition from the interface or class you pass when creating the mock. EasyMock has two sets of APIs. One is intended for creation and manipulation of mock objects that are based on interfaces, the other on classes org. Both provide the same basic functionality; however classextensions does not have quite as extensive as an API as the regular EasyMock does.

There are two main ways to create a mock object using EasyMock, directly and thru a mock control. When created directly, mock objects have no relationship to each other and the validation of calls is independent.

When created from a control,all of the mock objects are related to each other. This allows for validation of method calls across mock objects when created with the EasyMock. Table 6 describes the API available for creating mock objects.

Other resources

These are static methods that are available on both versions of EasyMock regular and classextension. There are three groups of scenarios that exist when recording behavior: Each of which is handled slightly different. Void methods are the easiest behavior to record. Since they do not return anything, all that is required is to tell the mock object what method is going to be called and with what parameters.

This is done by calling the method just as you normally would. When methods return values a mock object needs to be told the method call and parameters passed as well as what to return. Negative testing is an important part of unit testing. In order to be able to test that a method throws the appropriate wasymock when required, a mock object must be able to throw an exception when called. There are times where a method will blok called multiple times or even an unknown number of times.


EasyMock provides the ability to indicate those scenarios with the. When replaying recorded behavior in EasyMock, EasyMock uses the. On many objects, this may not be the desired behavior arrays are one example. EasyMock has a collection of matchers to solve this issue.

Matchers are used to compare things in ways other than the. Custom matchers can be created by implementing the org. Once the behavior of the mock objects has been recorded with expectations, the mock objects must be prepared to replay those expectations.

Mock objects are prepared by calling the replay method and passing it all of the mock objects to be replayed. The final step in the mock object lifecycle is to boo, that all expectations were met. That includes validating that all methods that were expected to be called were called and that any calls that were not expected are also noted.

To do that, Dasymock. The verify method takes all of the mock objects that were created as parameters, similar to the replay method. JUnit provides a basic set of functionality that is applicable to all types of testing. JUnit extensions are projects that add on features that are specific to a particular type of testing. Table 9 shows a list of the more popular extensions.

The internet holds a large collection of resources on test driven development, JUnit and EasyMock. Table 10 lists just a few of the more popular resources. Over a million developers have joined DZone. Refcard JUnit and EasyMock.

Test-Driven Java Development – Second Edition by Viktor Farcic, Alex Garcia

Seamless Unit Testing and Mocking for Java Guides you through the creation of unit tests with JUnit and EasyMock, with detailed definitions for unit testing and mock objects.

PDF for easy Boook. A test consists of four phases: Prepare Sets up a baseline for testing and defines the expected results. Execute Running the test. Validate Validates the results of the test against previously defined expectations.

Reset Resets the system to the way it was before Prepare. A test method is defined by any method that fits the following criteria: It must be public. It must return void. Figure 1 import junit. JUnit Lifecycle, continued Lifecycle stage Method called Method description Setup public void setUp Called to do any required preprocessing before a test. Examples include instantiating Test public void testXYZ Each test method is called once within biok test lifecycle.

It performs all required testing. Test results are recorded by JUnit for reporting to the test runner upon completion. Teardown public void tearDown Called to do any required post processing after a test.