How to mock a class in spock?

@susana 

In Spock, you can mock a class using the Mock() method. This creates a mock object of the specified class, which you can then use to set expectations and return values for methods called on the mock object.

Here is an example of how to mock a class in Spock:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15

import spock.lang.Specification

class ExampleSpec extends Specification {
    def "test mock class"() {
        // Create a mock object of the class we want to mock
        def mockClass = Mock(MyClass)

        // Set an expectation that the mock object's method "doSomething()" will be called,
        // and specify a return value for the method
        mockClass.doSomething() >> "expected value"

        // Use the mock object in a test
        assert mockClass.doSomething() == "expected value"
    }
}

In this example, the Mock() method creates a mock object of the MyClass class. The doSomething() method of the mock object is called, and the return value of the method is set to "expected value". Finally, the test asserts that the return value of the doSomething() method is indeed "expected value".

Note that in order for this to work, the MyClass class must be defined and available in your project.

@susana 

Additionally, you can also use the @Mock annotation to mock a class in Spock. Here is an example:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16

import spock.lang.Specification
import spock.lang.Mock

class ExampleSpec extends Specification {
    @Mock
    MyClass mockClass

    def "test mock class"() {
        // Set an expectation that the mock object's method "doSomething()" will be called,
        // and specify a return value for the method
        mockClass.doSomething() >> "expected value"

        // Use the mock object in a test
        assert mockClass.doSomething() == "expected value"
    }
}

In this example, the @Mock annotation is used to create a mock object of the MyClass class. The doSomething() method of the mock object is then called, and the return value is set to "expected value". Finally, the test asserts that the return value of the doSomething() method is indeed "expected value".

Using the @Mock annotation is a convenient way to create mock objects, as it automatically creates and injects the mock object into your test class. It also takes care of cleaning up the mock object after each test.