BuildResult result = GradleRunner.create()
            .withProjectDir(testProjectDir)
            .withArguments("helloWorld")
            .build();

        assertTrue(result.getOutput().contains("Hello world!"));
        assertEquals(SUCCESS, result.task(":helloWorld").getOutcome());
    }

    private void writeFile(File destination, String content) throws IOException {
        BufferedWriter output = null;

        BuildResult result = GradleRunner.create()
            .withProjectDir(testProjectDir)
            .withArguments("helloWorld")
            .build();

        assertTrue(result.getOutput().contains("Hello world!"));
        assertEquals(SUCCESS, result.task(":helloWorld").getOutcome());
    }

    private void writeFile(File destination, String content) throws IOException {
        BufferedWriter output = null;

                id 'org.gradle.sample.helloworld'
            }
        """

        when:
        def result = GradleRunner.create()
            .withProjectDir(testProjectDir)
            .withArguments('helloWorld')
            .withPluginClasspath()
            .build()

        then:
        result.output.contains('Hello world!')
        result.task(":helloWorld").outcome == SUCCESS
    }

                id 'org.gradle.sample.helloworld'
            }
        """

        when:
        def result = GradleRunner.create()
            .withProjectDir(testProjectDir)
            .withArguments('helloWorld')
            .withPluginClasspath()
            .build()

        then:
        result.output.contains('Hello world!')
        result.task(":helloWorld").outcome == SUCCESS
    }

            }
            
            task silence {}
            
            task all {
                dependsOn helloWorld, byeWorld, silence
            }
        """
        when:
        succeeds('all')

        then:
        result.groupedOutput.task(':helloWorld').output == helloWorldMessage
        result.groupedOutput.task(':byeWorld').output == byeWorldMessage

                }

                def "execute helloWorld task"() {
                    given:
                    buildFile << 'apply plugin: "$plugin.id"'

                    when:
                    def result = GradleRunner.create()
                        .withProjectDir(testProjectDir)
                        .withArguments('helloWorld')
                        .withDebug($debug)

env GOPATH= # reset to default ($HOME/go, which does not exist)
env GOBIN=
! go install go-cmd-test/helloworld.go
stderr '^go: no install location for \.go files listed on command line \(GOBIN not set\)$'

# With $GOBIN set, should install there.
env GOBIN=$WORK/bin1
go install go-cmd-test/helloworld.go
exists $GOBIN/helloworld$GOEXE

# We can't assume that we can write to GOROOT, because it may not be writable.

                void apply(Project project) {
                    project.task('helloWorld$suffix', type: HelloWorld$suffix)
                }
            }
        """

        projectDir.file("src/main/groovy/org/gradle/test/HelloWorld${suffix}.groovy") << """
            package org.gradle.test

            import org.gradle.api.DefaultTask

        given:
        buildFile << """
            task helloWorld

            task byeWorld {
                onlyIf {
                    false
                }
            }
        """

        when:
        def result = runner('helloWorld', 'byeWorld')
            .build()

        then:
        result.tasks.collect { it.path } == [':helloWorld', ':byeWorld']
        result.taskPaths(SUCCESS) == []

        given:
        def standardOutput = new StringWriter()
        def standardError = new StringWriter()
        buildScript helloWorldWithStandardOutputAndError()

        when:
        def result = runner('helloWorld', "-d", "-s")
            .forwardStdOutput(standardOutput)
            .forwardStdError(standardError)
            .build()

        then:
        result.output.findAll(OUT).size() == 1