result.assertTaskNotSkipped(second)

        when:
        withBuildCache().run(first)
        then:
        // first overwrites second's output if executed on its own
        sharedOutput.text == "Generated by ${first}"
        // first is not loaded from cache because of overlap
        result.assertTaskNotSkipped(first)
    }

        expect:
        withBuildCache().run "jar" assertTaskNotSkipped ":compileJava" assertTaskNotSkipped ":jar"

        when:
        file("src/main/java/Hello.java").text = CHANGED_HELLO_WORLD
        then:
        withBuildCache().run "jar" assertTaskNotSkipped ":compileJava" assertTaskNotSkipped ":jar"

        when:
        file("src/main/java/Hello.java").text = ORIGINAL_HELLO_WORLD

        withBuildCache().run "customTask"
        then:
        result.assertTaskNotSkipped(":customTask")
        file("build/output.txt").text == "input"

        when:
        taskSourceFile.text = defineCachedTask(" modified")

        cleanBuildDir()
        withBuildCache().run "customTask"
        then:
        result.assertTaskNotSkipped(":customTask")
        file("build/output.txt").text == "input modified"
    }

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

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

        then:
        result.assertTaskNotSkipped(':copy')
        file('dest').assertHasDescendants(
            'one.txt',
            'three.txt'
        )
    }

    def "can filter the elements of a file collection using a closure"() {

        then:
        result.assertTaskNotSkipped(":generate")
        file("build/out.txt").text == "value"

        when:
        runWithInput("generate", prompt, "value")

        then:
        result.assertTaskSkipped(":generate")

        when:
        runWithInput("generate", prompt, "")

        then:
        result.assertTaskNotSkipped(":generate")

            outputResult.assertTasksNotSkipped(expected);
            return this;
        }

        @Override
        public ExecutionResult assertTaskNotSkipped(String taskPath) {
            assertThat(getNotSkippedTasks(), hasItem(taskPath));
            outputResult.assertTaskNotSkipped(taskPath);
            return this;
        }

        private Set<String> getNotSkippedTasks() {

            }

            class Foo {
                int x
                String toString() { "xxx" }
            }
        """

        expect:
        run("foo").assertTaskNotSkipped(":foo")
        run("foo").assertTaskSkipped(":foo")
    }

    @Issue("https://issues.gradle.org/browse/GRADLE-3435")
    def "task is not up-to-date after file moved between input properties"() {

        }

        return failure
    }

    protected void executedAndNotSkipped(String... tasks) {
        assertHasResult()
        tasks.each {
            result.assertTaskNotSkipped(it)
        }
    }

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

    protected void allSkipped() {
        assertHasResult()