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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The argument matches one of the Matchers m 1 to m n. The invocation is expected at least min times and at most max times. 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. Constants have the added benefit of making the test easier to understand than they would be if unnamed, literal values were used.

The invocation is expected exactly n times. Allowing or ignoring should be chosen to make the test code clearly express intent. Conditions are represented as states of state machines. In outline, a jMock 2 test looks like the following: A Mockery represents the context of the object under test: You can define expectations in helper methods or the setUp method to remove duplication or clarify the test code.

An expectations block can contain any number of expectations. The type argument is required to force Java to type-check the argument at compile time.

Specifying Expectations

It is copkbook more convenient to store mock objects in instance variables and define constants for the values used in the test, as the examples above do. An invocation can be constrained to occur during a state of one more more state machines. Expectations do not have to be defined in the body of the test method. Software jMock 2 Java 1. You can give an expectation as many inSequence 2when 3will and then 4 clauses as you wish.

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Software jMock 2 Java 1. The most commonly used matchers are defined in the Expectations 1 class:.

This can be used to clarify exactly when expected calls will happen in response to calls to the object under test. Except for the invocation count and the mock object, all clauses are optional. This is used to make tests more explicit and so easier to understand. Because the expectations are defined within an anonymous inner class, any mock objects or other values that are stored in local variables and referenced from within the expectations block must be final.

To define looser constraints, specify all arguments as matchers within with clauses:. Constrains the last expectation to occur cookboko when the state machine is in the named state.

The argument is not null. 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:.

The argument is null. Expectations in later blocks are appended to those in earlier blocks. To expect a sequence of invocations, write the expectations in order and add the inSequence sequence clause to each one. In outline, a jMock 2 test looks like the following:. Each expectation has the following structure:. The argument matches all of the Matchers m 1 to m n.

Tests written with JUnit 3 can extend MockObjectTestCase, in which case they don’t need to explictly create or refer to the context.

jMock – Specifying Expectations

An expectations block can contain any number of expectations. Expectations in later blocks are appended to those in earlier blocks. Specifying Expectations 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. The invocation is not expected at all. A test can create more than one sequence and an expectation can be part of more than once sequence at a time.

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Except for the invocation count 1 and the mock object, all clauses are optional. You can give an expectation as many inSequencewhenwill and then clauses as you wish. If not specified, the state machine starts in an unnamed initial state. A test can create multiple state machines and each state machine can have multiple states. Return a new iterator over elements v 1 to v n on each invocation.

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. The following clauses constrain invocations to occur within specific states and define how an invocation will change the current state of a state machine.

The JUnit 3 and JUnit 4 integration layers automatically assert that all expectations have been satisfied. A test can contain multiple expectation blocks.

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. Invocations cookkbook are expected in a sequence must occur in the order in which they appear in the test code.

A Mockery creates mock objects and checks expectations that are set upon those mock objects. The intial state is optional. A test can contain multiple expectation blocks.