}
            }
        """

        when:
        executer.withEnvironmentVars(ORG_GRADLE_PROJECT_myProp: 'fromEnv')

        then:
        succeeds 'printProperty'

        and:
        outputContains("myProp=fromEnv")

        when:
        executer.withEnvironmentVars(ORG_GRADLE_PROJECT_myProp: 'fromEnv2')

        then:
        succeeds 'printProperty'

                    }
                }
            }

            apply plugin: ShowPlugin
        """

        when:
        result = executer
            .withEnvironmentVars([JDK1: new File("/unknown/env").absolutePath, JDK2: firstJavaHome])
            .withArgument("-Porg.gradle.java.installations.paths=${new File("/unknown/path").absolutePath}," + secondJavaHome)

                return "using environment variable"
            }

            @Override
            void setup(AbstractConfigurationCacheIntegrationTest test) {
                test.executer.withEnvironmentVars(variables)
            }
        }
    }

    static void checkEnvironmentVariableUnset(String key) {

            withArgument("-D${PLUGIN_PORTAL_OVERRIDE_URL_PROPERTY}=${gradlePluginRepositoryMirrorUrl()}")
            withArgument("-Porg.gradle.java.installations.paths=${Jvm.current().javaHome.absolutePath}")
            withEnvironmentVars([BUILD_BRANCH: System.getProperty("gradleBuildBranch"), BUILD_COMMIT_ID: System.getProperty("gradleBuildCommitId")])
            withWarningMode(WarningMode.None)
            noDeprecationChecks()
        }.run()

        file('build.gradle') << "println providers.environmentVariable('foo').orNull"

        when:
        def out = executer.withEnvironmentVars(foo: "gradle rocks!").run().output

        then:
        out.contains("gradle rocks!")

        when:
        out = executer.withEnvironmentVars(foo: "and will be even better").run().output

        then:
        out.contains("and will be even better")
    }

        // if call `using m2`, then we disable the automatic isolation of m2
        isolateMavenLocal = false
        if (globalMavenDirectory?.exists()) {
            gradleExecuter.withEnvironmentVars(M2_HOME: globalMavenDirectory.absolutePath)
        }
    }

    void isolateMavenLocalRepo(GradleExecuter gradleExecuter) {
        gradleExecuter.beforeExecute {
            if (isolateMavenLocal) {

            }
        """

        when:
        // This prevents the executer fixture from adding "default" values to the build jvm options
        executer.useOnlyRequestedJvmOpts()
        executer.withEnvironmentVars(JAVA_TOOL_OPTIONS: javaToolOptions)
        run "verify"

        then:
        String gradleVersion = (output =~ /GRADLE_VERSION: (.*)/)[0][1]
        daemons(gradleVersion).daemons.size() == 1

        where:

    }

    private def requireJvmArg(String jvmArg) {
        file('gradle.properties') << "org.gradle.jvmargs=$jvmArg"
    }

    private def runWithJvmArg(String jvmArg) {
        executer.withEnvironmentVars(["JAVA_OPTS": "$jvmArg -ea"])
    }

    private void wasForked() {
        outputContains(SingleUseDaemonClient.MESSAGE)
        assert daemons.daemons.size() == 1
    }