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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Software jMock 2 Java 1. Tests written with JUnit 4 do not need to extend a specific base class but must specify that cookboook 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. Expectations are defined within a “Double-Brace Block” that defines the expectations in the context of the the test’s Mockery identified as context in the examples below.

jMock – jMock 2 Cheat Sheet

JUnit 3 JUnit 4 Other. The argument is null. In outline, a jMock 2 test looks like the following: A Mockery creates mock objects and checks expectations that are set upon those mock objects.

The type argument is required to force Java to type-check the argument at compile time. The argument matches all of the Matchers m 1 to m n. Do all actions a 1 to a n on every invocation. The following clauses constrain invocations to occur within specific states and define how an invocation will change the current state of a state machine.

An invocation can be constrained to occur during a state of one more more state machines. JUnit 3 JUnit 4 Other. For example, the test above can be rewritten as follows to more clearly express when the cache loads an object will be loaded and when it returns a cached copy:.


Conditions are represented as states of state machines. The invocation is expected at least min times and at most max times.

This can be used to clarify exactly when expected calls will happen in response to calls to the object under test. You can give an expectation as many inSequence 2when 3will and then 4 clauses as you wish. The argument matches one of the Matchers m 1 to m n. A test can create multiple state machines and each state machine can have multiple states. To define looser constraints, colkbook all arguments as matchers within with clauses:.

The invocation is not expected at all. Except for the invocation count and the mock object, all clauses are optional. Return a new iterator over cookbooj v 1 to v n on each invocation.

To expect a sequence of invocations, write the expectations in order and add the inSequence sequence clause to each one. This is used to make tests more explicit and so easier to understand. A Mockery represents the context of the object under test: It is often more convenient to store mock objects in instance variables and define constants cokbook the values used in the cookbolk, as the examples above do.

Constrains the last expectation to occur only when the state machine is in the named state. A test can contain multiple expectation blocks. The examples above assume that the mock object is stored in an instance variable. States are used to constrain invocations to occur only when a condition is true. Changes vookbook state of state-machine to the named state when the invocation occurs.

Except for the invocation count 1 and the mock object, all clauses are optional. You can define expectations in helper methods or the setUp method to remove duplication or clarify the test code. Constants have the added benefit of making the test easier to understand than they would be if unnamed, literal values were used.

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If not specified, the state machine starts in an unnamed initial state. In outline, a jMock 2 test looks like the following:.

The jMock Cookbook

A test can create more than one sequence and an expectation can be part of more than once sequence at a time. You can give an expectation as many inSequencewhenwill and then clauses as you vookbook.

Allowing or ignoring should be chosen to make the test code clearly express intent. The argument is not null. An expectations block can contain any number of expectations.

The most commonly used matchers are defined in the Expectations 1 class:. Each cookboik has the following structure:. A test can contain multiple expectation blocks. Expectations do not have to be defined in the body of the test method. Software jMock 2 Java 1. More matchers are defined as static factory methods of the Hamcrest Matchers class 2which can be statically imported at the top of the test code.

jMock 2 Cheat Sheet

Expectations can be interspersed with calls to the code under test. Expectations in later blocks are appended to those in earlier blocks. The intial state is optional.

The argument is any value. Invocations that are expected in a sequence must occur in the order in which they appear in the test code.