}

project(':child3') {
    java.sourceCompatibility = 1.8
}
"""
        when:
        succeeds "idea"

        then:
        ipr.languageLevel == "JDK_1_8"
        iml('root').languageLevel == "JDK_1_6"
        iml("child1").languageLevel == "JDK_1_7"
        iml("child2").languageLevel == "JDK_1_5"
        iml("child3").languageLevel == null
    }

    @ToBeFixedForConfigurationCache

apply plugin: "idea"
'''
        file('settings.gradle') << 'rootProject.name = "root"'

        //when
        executer.withTasks('idea').run()

        //then
        assertProjectLanguageLevel("root.ipr", "JDK_1_6")
    }

    void assertProjectLanguageLevel(String iprFileName, String javaVersion) {
        def project = new XmlSlurper().parse(file(iprFileName))