Using PowerMock with Spock

There is no special integration; your best bet is to try and use PowerMock "as-is". From what I remember, PowerMock used to have problems with Groovy, and I don't know if this has been solved. And if I'm not mistaken, PowerMock rewrites the byte code of test classes, so the next question is if it works with Spock. Let us know what you find.

I was stuck here for a while too. After searching for hours, I saw this github repo: https://github.com/kriegaex/Spock_PowerMock.

I tried adding a PowerMockRule which essentially enabled me to use PowerMock together with Spock. I had to add these dependencies. Version is at 1.5.4

   <dependency>
      <groupId>org.powermock</groupId>
      <artifactId>powermock-module-junit4</artifactId>
      <version>${powermock.version}</version>
      <scope>test</scope>
   </dependency>

   <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-module-junit4-rule</artifactId>
        <version>${powermock.version}</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-classloading-xstream</artifactId>
        <version>${powermock.version}</version>
        <scope>test</scope>
    </dependency>

My class looks like this:

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

@PrepareForTest([SomeStaticClass.class])
public class FlightFormSpec extends Specification { 

    @Rule PowerMockRule powerMockRule = new PowerMockRule();

    def "When mocking static"() {
        setup :
            PowerMockito.mockStatic(SomeStaticClass.class)

        when :
            Mockito.when(SomeStaticClass.someStaticMethod()).thenReturn("Philippines!");

        then :
            SomeStaticClass.someStaticMethod() == "Philippines!"
    }
}

Here is another resource: https://github.com/jayway/powermock/wiki/powermockrule