SpringBoot spring boot OutputCaptureRule throws "No system captures found" in spock 2.0 tests.

Java 11.0.6, Dependencies:

testImplementation('org.spockframework:spock-core:2.0-M2-groovy-3.0')
testImplementation('org.springframework.boot:spring-boot-test: 2.2.7.RELEASE')

class OutputCaptureTest extends Specification {

    @Rule
    OutputCaptureRule capture = new OutputCaptureRule()

    def "test output"() {
        when:
        println "hello"

        then:
        capture.toString().contains("hello")
    }
}

Exception:

Condition failed with Exception:

capture.toString().contains("hello")
|       java.lang.IllegalStateException: No system captures found. Please check your output capture registration.
|           at org.springframework.util.Assert.state(Assert.java:73)
|           at org.springframework.boot.test.system.OutputCapture.get(OutputCapture.java:129)
|           at org.springframework.boot.test.system.OutputCapture.getAll(OutputCapture.java:100)
|           at org.springframework.boot.test.system.OutputCapture.toString(OutputCapture.java:90)
|           at org.springframework.boot.test.system.OutputCaptureRule.toString(OutputCaptureRule.java:110)
|           at com.me.OutputCaptureTest.test output(OutputCaptureTest.groovy:17)
org.springframework.boot.test.system.OutputCaptureRule@5705a8db (renderer threw IllegalStateException)

Comment From: philwebb

It looks like Spock isn't executing that JUnit rule. You can try debugging your tests with a breakpoint on OutputCaptureRule.apply to confirm. I'm afraid you'll need to get help from the Spock community if that's the case.

Comment From: jmuollo

See https://stackoverflow.com/a/70350184/3059685 for a potential solution to this problem.

Comment From: kiriphorito

Another potential solution for this is to add/import: org.spockframework:spock-junit4 https://mvnrepository.com/artifact/org.spockframework/spock-junit4

I originally only had: org.spockframework:spock-spring

Comment From: ykcai

Another potential solution for this is to add/import: org.spockframework:spock-junit4 https://mvnrepository.com/artifact/org.spockframework/spock-junit4

I originally only had: org.spockframework:spock-spring

This fixed my issues!