The Overview page is the front page of this API document and provides a list of all packages with a summary for each. This page can also contain an overall. Switches all registered mock objects (more exactly: the controls of the mock objects) to replay mode. For details, see the EasyMock documentation. Why. Great testing includes isolation. Most parts of a software system do not work in isolation, but collaborate with other parts to get their job done. In a lot of.

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EasyMockSupport (EasyMock API)

The following description demonstrates the usage of EasyMock. A first attempt may look like:. There’s deep, dark magic here, coming from a combination of Java 5 generics and dynamic proxies introduced way back in Java 1.

Truth be told, Listing 3 failed the first time I ran it, as tests are wont to do. This is the old version of strictMock String, Classwhich is more completion friendly Type Parameters: Creates a mock object, of the requested type, that implements the given interface or extends the given class. Create a new test for IncomeCalculator and place the new test class in this folder. In a lot of cases, we do not care about using real collaborators implementation in unit testing, as we trust these collaborators.

Class Mocking Limitations To be coherent with interface mocking, EasyMock provides a built-in behavior for equalstoStringhashCode and finalize even for class mocking. Node 25 methods or java. Both have the exact same behavior. Instead of defining eqException with a Throwable as parameter and return value, we use a generic type that extends Throwable: Expects a string that matches the given regular expression.


Not only is it well crafted and easy to use. I can be a little pickier and specify EasyMock. Here is the test without the definition of the Mock Object: For details, see the EasyMock documentation. In this case, the first thing to do is to consider a refactoring since most of the time this problem was caused by a bad design. There is one error that we have not handled so far: Choosing one of the other is a matter of taste.

Expects a string that contains a substring that matches the given regular expression.

Verifies all registered mock objects have docimentation expectations met and that no unexpected call was performed.

Moreover, it encourages us to make more frequent use of MockObjects leading to compositional and interface oriented designs. Available for primitive and object arrays.

Using Easy Mock and JUnit 4.

Getting Started

EasyMock lets you create implementations of large interfaces like java. The type of the returned value is checked at compile time.

They allow to delegate the call to a concrete implementation easymick the mocked interface that will then provide the answer. However, this case should be quite rare.

There are a couple of predefined argument matchers available. Just add the following dependency to your pom. This matcher and anyObject Class can be used in these three ways: They make tests more unitary. Expects a double that has an absolute difference to the given value that is less rasymock the given delta.

This usually happens when you want to test a method that calls some others in the same class. Expects a long argument less than the given value. Creates a mock object of the requested type that implements the given interface or extends the given class. Switches the given mock objects more exactly: Finally, notice the use of EasyMock. To verify that the specified behavior has been used, we have to call verify mock: Fork me on GitHub.


Contains methods to create, replay and verify mocks and a list of standard matchers. It does nothing that couldn’t be done by manually writing mock classes, and in the case of manually written classes your project would be a dependency or two leaner.

EasyMock Tutorial

It also enhances communication in the TestCase for it exposes the expected calls on the MockObject right where you need it. It is possible to mock out so much that a test always passes even when the code is seriously broken.

Listing 4 tests this:. EasyMock can save a lot of legwork and make unit tests a lot faster to write. Positive return values are a vote for removal. It allows writing the expected call as argument, i. EasyMock provides a default behavior for Object’s methods equals, hashCode, toString, eadymock. If we would like to state this explicitely, once or times 1 may be used. Working with Exceptions For specifying exceptions more exactly: Default is false easymock.

We were about to implement our own Mocking based on reflect.

To match an actual method call on the Mock Object with an expectation, Object arguments are by default compared with equals. However, the larger and more complex an interface becomes, the more onerous it is to write individual mocks for each unit test.