then:
        outputContains('mySystemProp=commandline')
    }

    def "can always change buildDir in properties file"() {
        when:
        file('gradle.properties') << """
            buildDir=otherBuild
        """
        then:
        succeeds ':help'
    }

    def "Gradle properties can be derived from environment variables"() {
        given:
        buildFile << """