new IdeaLanguageLevel(JavaVersion.VERSION_1_4).level == "JDK_1_4"
        new IdeaLanguageLevel(JavaVersion.VERSION_1_5).level == "JDK_1_5"
        new IdeaLanguageLevel(JavaVersion.VERSION_1_6).level == "JDK_1_6"
        new IdeaLanguageLevel(JavaVersion.VERSION_1_7).level == "JDK_1_7"
    }

    def "allows arbitrary language level in IDEA's format"() {
        expect:
        new IdeaLanguageLevel("JDK_1_8").level == "JDK_1_8"

    <modules>
      <module fileurl="file://$PROJECT_DIR$/root.iml" filepath="$PROJECT_DIR$/root.iml"/>
    </modules>
  </component>
  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_6" assert-keyword="true" jdk-15="true" project-jdk-type="JavaSDK" assert-jdk-15="true" project-jdk-name="1.6">
    <output url="file://$PROJECT_DIR$/out"/>
  </component>
  <component name="SvnBranchConfigurationManager">

}

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

      <module fileurl="file://$PROJECT_DIR$/webservice/webservice.iml" filepath="$PROJECT_DIR$/webservice/webservice.iml"/>
    </modules>
  </component>
  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_6" assert-keyword="true" jdk-15="true" project-jdk-type="JavaSDK" assert-jdk-15="true" project-jdk-name="1.6">
    <output url="file://$PROJECT_DIR$/out"/>
  </component>
  <component name="SvnBranchConfigurationManager">

    public boolean isJDK_1_4() {
        return "JDK_1_4".equals(level);
    }

    public boolean isJDK_1_5() {
        return "JDK_1_5".equals(level);
    }

    public boolean isJDK_1_6() {
        return "JDK_1_6".equals(level);
    }

    public boolean isJDK_1_7() {
        return "JDK_1_7".equals(level);
    }

    public boolean isJDK_1_8() {
        return "JDK_1_8".equals(level);
    }

    @Override

      <module fileurl="file://$PROJECT_DIR$/a/a.iml" filepath="$PROJECT_DIR$/a/a.iml"/>
    </modules>
  </component>
  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_6" assert-keyword="true" jdk-15="true" project-jdk-type="JavaSDK" assert-jdk-15="true" project-jdk-name="1.6">
    <output url="file://$PROJECT_DIR$/out"/>
  </component>
  <component name="SvnBranchConfigurationManager">

    "JDK_16_0",
    "JDK_16_0_x64",
    "JDK_16_x64",
    "JDK_17",
    "JDK_17_0",
    "JDK_17_0_x64",
    "JDK_17_x64",
    "JDK_18",
    "JDK_18_x64",
    "JDK_19",
    "JDK_19_x64",
    "JDK_1_6",
    "JDK_1_6_x64",
    "JDK_1_7",
    "JDK_1_7_x64",
    "JDK_1_8",
    "JDK_1_8_x64",
    "JDK_9",
    "JDK_9_0",
    "JDK_9_0_x64",
    "JDK_9_x64",
    "JDK_HOME",
    "JRE_HOME",

        ideaProjectTask.ideaProject.jdkName == JavaVersion.current().toString()
        ideaProjectTask.ideaProject.languageLevel.level == "JDK_1_6"

        childProject.tasks.findByName('ideaProject') == null
        childProject.tasks.findByName('cleanIdeaProject') == null
    }

    def "adds 'openIdea' task to root project"() {
        when:

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))