output.text == "22"

        when:
        configurationCacheRun(":transformer")

        then:
        configurationCache.assertStateLoaded()
        result.assertTasksSkipped(":producer", ":transformer")
    }

    def "task input property can consume the flat mapped output of another task"() {
        taskTypeWithInputFileProperty()
        taskTypeWithIntInputProperty()

        then:
        configurationCache.assertStateLoaded()
        result.assertTaskSkipped(":$spec.copyTask")

        when:
        spec.mutateExcludedFiles()

        and:
        configurationCacheRun spec.copyTask

        then:
        configurationCache.assertStateLoaded()
        result.assertTasksSkipped(":$spec.copyTask")

        where:
        spec << DefaultExcludesFixture.specs()
    }

        then:
        result.assertTasksExecutedAndNotSkipped(":a")
        outputFile.assertIsFile()

        when:
        configurationCacheRun "a"

        then:
        result.assertTasksSkipped(":a")

        when:
        outputFile.delete()
        configurationCacheRun "a"

        then:
        result.assertTasksExecutedAndNotSkipped(":a")
        outputFile.assertIsFile()
    }

        @Override
        public ExecutionResult assertTasksSkipped(Object... taskPaths) {
            Set<String> expected = new TreeSet<>(flattenTaskPaths(taskPaths));
            assertThat(skippedTasks, equalTo(expected));
            outputResult.assertTasksSkipped(expected);
            return this;
        }

        @Override
        public ExecutionResult assertTaskSkipped(String taskPath) {

        this.result.assertTasksExecuted(":compileJava", ":processResources", ":classes", ":jar", ":compileTestJava", ":processTestResources", ":testClasses", ":test", ":assemble", ":check", ":build")
        result.assertTasksSkipped(":processResources", ":processTestResources")
        classFile.isFile()
        testClassFile.isFile()
        testResults.isDirectory()
        assertTestsExecuted("ThingTest", "ok")
    }

    protected void noneSkipped() {
        assertHasResult()
        result.assertTasksSkipped()
    }

    protected void allSkipped() {
        assertHasResult()
        result.assertTasksNotSkipped()
    }

    protected void skipped(String... tasks) {
        assertHasResult()
        tasks.each {
            result.assertTaskSkipped(it)
        }
    }

        result.assertTaskOrder(":a:producer", ":resolve")
        result.assertTaskOrder(":b:producer", ":resolve")
        result.assertTaskSkipped(":additionalFile")
        result.assertTaskSkipped(":a:producer")
        result.assertTaskSkipped(":b:producer")
        outputContains("result = [a.thing, b.thing, a.out, b.out, lib1-6500.jar]")

        when:

        configurationCacheRun 'processResources'

        then: 'the 2nd time it is loaded from the cache'
        configurationCache.assertStateLoaded()

        and: 'the task is up-to-date'
        result.assertTaskSkipped ':processResources'
    }

        configurationCacheRun "clean"
        configurationCacheRun "build"

        then:
        configurationCache.assertStateLoaded()
        result.assertTaskExecuted(":compileGroovy")
        result.assertTaskSkipped(":compileGroovy")
    }

    def "assemble on Groovy project with sources but no groovy dependency is executed and fails with a reasonable error message"() {
        given:

        file('dest').assertHasDescendants(
            'one.txt'
        )

        when:
        file('files/b/ignore.txt').createFile()
        run 'copy'

        then:
        result.assertTaskSkipped(':copy')
        file('dest').assertHasDescendants(
            'one.txt'
        )

        when:
        file('files/a/three.txt').createFile()
        run 'copy'

        then: