Mock static method with GroovyMock or similar in Spock

Question

First-timer here, apologies if I\'ve missed anything. I\'m hoping to get around a call to a static method using Spock. Feedback would be great

With groovy mocks, I

Answer 1

Spock can only mock static methods implemented in Groovy. For mocking static methods implemented in Java, you'll need to use a tool like GroovyMock , PowerMock or JMockit.

PS: Given that these tools pull of some deep tricks in order to achieve their goals, I'd be interested to hear if and how well they work together with tests implemented in Groovy/Spock (rather than Java/JUnit).

Answer 2

Here is how I solved my similar issue (mocking a static method call which is being called from another static class) with Spock (v1.0) and PowerMock (v1.6.4)

import org.junit.Rule
import org.powermock.core.classloader.annotations.PowerMockIgnore
import org.powermock.core.classloader.annotations.PrepareForTest
import org.powermock.modules.junit4.rule.PowerMockRule
import spock.lang.Specification
import static org.powermock.api.mockito.PowerMockito.mockStatic
import static org.powermock.api.mockito.PowerMockito.when

@PrepareForTest([YourStaticClass.class])
@PowerMockIgnore(["javax.xml.*", "ch.qos.logback.*", "org.slf4j.*"])
class YourSpockSpec extends Specification {

@Rule
Powermocked powermocked = new Powermocked();

def "something something something something"() {
    mockStatic(YourStaticClass.class)

    when: 'something something'
    def mocked = Mock(YourClass)
    mocked.someMethod(_) >> "return me"

    when(YourStaticClass.someStaticMethod(xyz)).thenReturn(mocked)

    then: 'expect something'
    YourStaticClass.someStaticMethod(xyz).someMethod(abc) == "return me"

   }
}

The @PowerMockIgnore annotation is optional, only use it if there is some conflicts with existing libraries

Answer 3

The way I've gotten around static methods in Groovy/Spock is by creating proxy classes that are substituted out in the actual code. These proxy classes simply return the static method that you need. You would just pass in the proxy classes to the constructor of the class you're testing.

Thus, when you write your tests, you'd reach out to the proxy class (that will then return the static method) and you should be able to test that way.