if(property == null) {
            return GradleVersion.version("0.0");
        }
        return GradleVersion.version(property);
    }

    public GradleVersionSpec() {
        this.lowestTestedVersion = getLowestTestedVersion();
    }

    public GradleVersionSpec(String lowestTestedVersion) {
        this.lowestTestedVersion = GradleVersion.version(lowestTestedVersion);
    }

    }

    def "unsupported operator"() {
        when:
        new GradleVersionSpec().toSpec("-1.3")

        then:
        thrown(RuntimeException)
    }

    def "RuntimeExcpetion is thrown if a version lower than the minimal tested is specified"() {
        given:
        def spec = new GradleVersionSpec("3.0")

        when:
        spec.toSpec("<1.3")

        then:

class ToolingApiExecution extends AbstractMultiTestInterceptor.Execution {

    private static final GradleVersion INSTALLATION_GRADLE_VERSION
    private static final GradleVersionSpec GRADLE_VERSION_SPEC = new GradleVersionSpec()

    static {
        // If we are testing a non-current tooling API version, we will have loaded the class using its classloader and thus