Write an awesome description for your new site here. You can edit this line in It will appear in your document head meta (for Google search results ). JUnit + JMock. JMock – Java framework for mock objects, which helps by: automatically creating mock objects The JMock homepage at The JMock Cookbook at http://jmock. org/ The JMock cheetsheet at

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A Mockery represents the context of the object under test: A Mockery creates mock objects and checks expectations that are set upon those mock objects.

By convention the Mockery is stored in an instance variable named context. Tests written with JUnit cookvook can extend MockObjectTestCase, in which case they don’t need to explictly create or refer to the context. Tests written with JUnit 4 do not need to extend a specific base class but must specify that they use jMock with the RunWith attribute, create a JUnit4Mockery that reports expectation failures as JUnit 4 test failures, and store the Mockery in an instance variable.

The examples above assume that the mock object is stored in an instance variable. If a mock object is stored in a local variable, the variable must be declared as final so that it can be referred to from within expectation blocks see below.

The JUnit 3 and JUnit 4 cookbopk layers automatically assert that all expectations have been satisfied. An expectations block can contain any number of expectations.


A test can contain multiple expectation blocks. Expectations in later blocks are appended to those in earlier blocks. Expectations can be interspersed with calls to the code under test. Except for the invocation count and the mock object, cookbookk clauses are optional. You can give an expectation as many inSequencewhenjomck and then clauses as you wish.

To define looser constraints, specify all arguments as matchers within with clauses:. The most commonly used matchers are defined in the Expectations 1 class:. More matchers are defined as static factory clokbook of the Hamcrest Matchers class 2which can be statically imported at the top of the test code.

jMock 2 Cheat Sheet

Invocations that are expected in a sequence must occur in the order in which they appear in the test code. A test can create more than one sequence and an expectation can be part of more than once sequence at a time.

To expect a sequence of invocations, cookbkok the expectations cookbooj order and add the inSequence sequence clause to each one. States are used to constrain invocations to occur only when a condition is true.

jMock – Specifying Expectations

Conditions are represented as states of state machines. A test can create multiple state machines and each state machine can have multiple states.

An invocation can be constrained to occur during a state of one more more state machines. The intial state is optional.

jMock – jMock 2 Cheat Sheet

If not specified, the state machine starts in an unnamed initial state. The following clauses constrain invocations to cookobok within specific states and define how an invocation will change the current state of a state machine. JUnit 3 JUnit 4 Other. Software jMock 2 Java 1. The invocation is expected exactly n times.


The invocation is expected at least min times and at most max times. The same as allowing. Allowing or ignoring should be chosen to make the test code clearly express intent.

The invocation is not expected at all. This is used to make tests more explicit and so easier to understand.

The jmcok is any value.

The type argument is required to force Java to type-check the argument at compile time. The argument is null. The argument is not null.

Specifying Expectations

The argument cookgook one of the Matchers m 1 to m n. The argument matches all of the Matchers m 1 to m n. Return a new iterator over elements v 1 to v n on each invocation.

Do all actions a 1 to a n on every invocation. Constrains the last expectation to occur only when the state machine is in the named state. Changes the state of state-machine to the named state cokbook the invocation occurs.