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. Jmocck jMock 2 Java 1. JUnit 3 JUnit 4 Other. Do all actions a 1 to a n on every invocation. Return a new iterator over elements v 1 to v n on each invocation. An expectations block can contain any number of expectations. Each expectation has the following structure:. The argument is any value.

A test can contain umock expectation blocks. 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. The invocation is expected at least min times and at most max times. The invocation is expected exactly n times.

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:. 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.

jMock – jMock 2 Cheat Sheet

A test can create multiple state machines and each state machine can jmockk multiple states. Tests written with JUnit 4 do not need to extend a jmkck 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.


In outline, a jMock 2 test looks like the following:. In outline, a jMock 2 test looks like the following: The intial state is optional. 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.

You can give an expectation as many inSequencewhenwill and then clauses as you wish. A test can contain multiple expectation blocks.

Specifying Expectations

The argument is null. The invocation is not expected at all. This is used to make tests more explicit and so easier jmokc understand. A Mockery represents the context of the object under test: By convention the Mockery is stored in an instance variable named context. To define looser constraints, specify all arguments as matchers within with clauses:.

Expectations do not have to be defined in the body of the test method.

The argument matches all of the Matchers m 1 to m n. It is often more convenient to store mock objects in instance variables and define constants for the values used in the test, as the examples above do.

JUnit 3 JUnit 4 Other. The examples above assume that the mock object is stored in an instance variable. This can be used to clarify exactly when expected calls will happen in response to calls to the object under test. States are used to constrain invocations to occur only when a condition is true. Allowing or ignoring should be chosen to make the test code clearly express intent.


You can define expectations in helper methods or the setUp method to remove duplication or clarify jmockk test code. Expectations in later blocks are appended to those in earlier blocks.

Conditions are represented as states of state machines. 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 jmoco all expectations have been satisfied.

Invocations that are expected in a sequence must occur in the order in which they appear in the test code. Except for the invocation count and the mock object, all clauses are optional. If not specified, the state machine starts in an unnamed initial state.

The most commonly used matchers are defined in the Expectations 1 class:. 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. You can give an expectation as many inSequence 2when 3will and then 4 clauses as you wish.