How to unit test logging error with Spock framework in groovy

Question

So I have a class that has a method that logs a message:

class Car {
    private Logger logger = LoggerFactory.getLogger(Car.class);


    void startCar() {
         


        

Answer 1

My Loggers are private static final so I cannot use solution mentioned above and rather not use Reflection. Alternative below.

If you are using Spring, you have acces to OutputCaptureRule.

@Rule
OutputCaptureRule outputCaptureRule = new OutputCaptureRule()

def test(){
outputCaptureRule.getAll().contains("<your test output>")
}

Answer 2

you could check for an invocation of error on the logger

@Grab(group='org.spockframework', module='spock-core', version='0.7-groovy-2.0')
@Grab(group='org.slf4j', module='slf4j-api', version='1.7.7')
@Grab(group='ch.qos.logback', module='logback-classic', version='1.1.2')

import org.slf4j.Logger

class MockLog extends spock.lang.Specification {

    public class Car {
        private Logger logger = org.slf4j.LoggerFactory.getLogger(Car.class);
        void startCar() {
            logger.error('car stopped working');
        }
    }

    def "mock log"() {
    given:
        def car = new Car()
        car.logger = Mock(Logger)
    when:
        car.startCar()
    then:
        1 * car.logger.error('car stopped working')
    }
}

edit: Full example https://github.com/christoph-frick/spock-test-logging