Mock Objects in Unit Tests

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Tutorial: Mock Objects in Unit Tests

EasyMock is a well-known mock tool that can create a mock object for a given interface at runtime.

Tutorial Details:

Unit testing your code against a service or process that's either too expensive (commercial databases) or just not done yet is something you can deal with by simulating the other piece with a mock object. EasyMock can suffice in some cases, but it can only create mock objects for interfaces. Mocquer, based on the Dunamis project, can create mocks for classes, too. Lu Jian shows how it works.

The mock object's behavior can be defined prior encountering the test code in the test case. EasyMock is based on java.lang.reflect.Proxy, which can create dynamic proxy classes/objects according to given interfaces. But it has an inherent limitation from its use of Proxy: it can create mock objects only for interfaces.

Life Cycle Control Methods

public void replay();
public void verify();
public void reset();

The mock object has three states in its life cycle: preparing, working, and checking. Figure 1 shows the mock object life cycle

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Mock Objects in Unit Tests
EasyMock is a well-known mock tool that can create a mock object for a given interface at runtime.

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