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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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. States are used to constrain invocations to occur only when a condition is true. The examples above assume that the mock object is stored in an instance variable.
This is used to make tests more explicit and so easier to understand. Invocations that are expected in a sequence must occur coo,book the order in which they appear in the test code.
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 jmovk you wish. The argument is not null. The argument matches one of the Matchers m 1 to m n.
jMock – Cookbook
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.
You can jjock expectations in helper methods or the setUp method to remove duplication or clarify the test code. The invocation is expected at least min times and at most max times. The same as allowing. The JUnit 3 and JUnit 4 integration layers automatically assert that all expectations have been satisfied. 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.
Conditions are represented as states of state machines. The type argument is required to force Java to type-check the argument at compile time. 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:.
To expect a sequence of invocations, write the expectations in order and add the inSequence sequence clause to each one. 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. Changes the state of state-machine to the named state when the invocation occurs. Software jMock 2 Java 1.
JUnit 3 JUnit 4 Other.
In outline, a jMock 2 test looks like the following:. Each expectation has the following structure:. Do all actions a 1 to a n on every invocation. The invocation is expected exactly n times.
The most commonly used matchers are defined in the Expectations 1 class:. Software jMock 2 Java 1.
The jMock Cookbook
Allowing or ignoring should be chosen to make the test code clearly express intent. You can give an expectation cooobook many inSequencewhenwill and then clauses as you wish. A test can create multiple state machines and each state machine can have multiple states.
Except for the invocation count 1 and the mock object, all clauses are optional.
Tests written with JUnit 3 can extend MockObjectTestCase, in which case they don’t need to explictly create or refer to the context. A test can contain multiple expectation blocks.
A test can contain multiple expectation blocks. An expectations block can contain any number of expectations. To define looser constraints, specify all arguments as matchers within with clauses:.
The argument is any value. By convention the Mockery is stored in an instance variable named context. An invocation can be constrained to occur during a state of one more more state machines. An expectations block can contain any number of expectations. Return a new iterator over elements v 1 to v n on each invocation. Expectations do not have to be defined in the body of the test method.
Constrains the last expectation to occur only when the state machine is in the named state. A Mockery represents the context of the object under test: Constants have the added benefit of making the test easier to understand than they would be if unnamed, literal values were used.
Expectations in later blocks are appended to those in earlier blocks. The argument matches all of the Matchers m 1 to m n. The argument is null. 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.
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.
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. Except for the invocation count and the mock object, all clauses are optional. Expectations can be interspersed with calls coo,book the code under test.