Jmock testing

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The document discusses using the jMock library for unit testing Java code. It explains that jMock is used with jUnit and helps isolate code dependencies by handling classes that rely on dependency injection. The document provides an example of using jMock expectations to mock method calls and returns for classes under test.

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Unit Testing
 What’s a ‘unit’?
 Code Isolation is important
 Code needs to be ‘testable’

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jMock
 Used with jUnit
 Handles classes that rely on dependency injection / IOC
 Helps further isolate testing

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jMock
 Expectations
 One(userService).getUser(someUserId);
will(returnValue(any(User.class))));

$+ jMock mockCtx.checking(new Expectations() {{ one(jSONServiceHelper).checkSession(request); will(returnValue(true)); exactly(2).of(request).getSession(); will(returnValue(session)); one(jSONServiceHelper).retriveCartVOFromSession(session); will(returnValue(cartVO)); one(jSONCartProcessingService).getProductDetails(price, prodId, duns); will(returnValue(tempCartVO)); one(jSONCartProcessingService).processShoppingCart(cartVO); will(returnValue(cartVO)); atLeast(1).of(session).setAttribute(WebCartConstants.WEBSALES_SESSION_CART, cartVO); }});$

Jmock testing

1. + Using JMock By Jeff Dilley

2. + Unit Testing  What’s a ‘unit’?  Code Isolation is important  Code needs to be ‘testable’

3. + jMock  Used with jUnit  Handles classes that rely on dependency injection / IOC  Helps further isolate testing

4. + jMock  Expectations  One(userService).getUser(someUserId); will(returnValue(any(User.class))));

5. + jMock mockCtx.checking(new Expectations() {{ one(jSONServiceHelper).checkSession(request); will(returnValue(true)); exactly(2).of(request).getSession(); will(returnValue(session)); one(jSONServiceHelper).retriveCartVOFromSession(session); will(returnValue(cartVO)); one(jSONCartProcessingService).getProductDetails(price, prodId, duns); will(returnValue(tempCartVO)); one(jSONCartProcessingService).processShoppingCart(cartVO); will(returnValue(cartVO)); atLeast(1).of(session).setAttribute(WebCartConstants.WEBSALES_SESSION_CART, cartVO); }});

Editor's Notes

#3: Unit testing. What’s a unit? A unit is specific isolated functionality. An example: UserService.CreateUser(); UserService.UpdateUser(); Code uses other code. Sometimes two units of code depend on each other. Having the ability to test one unit without having to test the other is important. Tests should not depend on each other even if the code does. Good code is easy to test. If a test is getting extremely overly complex, it’s usually because the code being tested is overly complex and might need to be refactored. Proper use of interfaces (dependency injection) and setters and OOP in general will help with this.
#4: jMock is used with jUnit. jUnit’s assertion library works well with jMock. AssertTrue, AssertEqual, AssertNotNull Classes that use dependency injection (inversion of control) for accessing services, daos, etc. can be injected with mock objects instead. What happens if the code im testing uses an external service that needs to perform some functionality like return a new object, a modified object, etc.? Mock objects can be configured to expect certain values and configured to return certain values. This allows tests to be consistent and helps isolate the test by nullifying external functionality.
#5: jMock provides an interface – Expectations – for mocking external behavior. It provides a flexible API for setting up expectations. Take a look at this example. A usersService.getUser will be called once. It will be passed a userId value and will return any object as long it is of type ‘User’ You can also use jMock to check, with assertions, that values being passed to a mocked object are correct. You can then pass specific values back from the mocked object to the tested object and verify the tested object acts on the specific values as expected.

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Jmock testing

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Editor's Notes