buildFile << """
            task myTask {
                def inputFile = file("input.txt")
                def outputFile = file("output.txt")
                inputs.file(inputFile)
                outputs.file(outputFile)
                doLast {
                    outputFile.text = inputFile.text
                }
            }
        """
        file("input.txt").text = "input"

            error(missingNormalizationStrategyConfig { type('MyTask').property('inputFile').annotatedWith('InputFile') }, 'validation_problems', 'missing_normalization_annotation'),
            error(missingNormalizationStrategyConfig { type('MyTask').property('inputFiles').annotatedWith('InputFiles') }, 'validation_problems', 'missing_normalization_annotation'),
        ])

        and:

                void execute() {
                    def buildDirectory = projectLayout.buildDirectory
                    inputFiles.files.each { File inputFile ->
                        def outputFile = buildDirectory.file(inputFile.name + ".out").get().asFile
                        GFileUtils.copyFile(inputFile, outputFile)
                    }
                }
            }
            allprojects {

                @InputFile inputFile
                @OutputFile outputFile

                @TaskAction copy() {
                    outputFile.parentFile.mkdirs()
                    outputFile.text = inputFile.text
                }
            }
            task customTask(type: NonCacheableTask) {
                inputFile = file("input.txt")

import org.gradle.api.tasks.Destroys;
import org.gradle.api.tasks.IgnoreEmptyDirectories;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.InputDirectory;
import org.gradle.api.tasks.InputFile;
import org.gradle.api.tasks.InputFiles;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.LocalState;
import org.gradle.api.tasks.Nested;
import org.gradle.api.tasks.Optional;
import org.gradle.api.tasks.OutputDirectories;

        LocalState        | '@LocalState'                                              | FileCollection | null
        InputFile         | '@InputFile @PathSensitive(PathSensitivity.NONE)'          | File           | "new File(\"input.txt\")"
        InputFiles        | '@InputFiles @PathSensitive(PathSensitivity.NAME_ONLY)'    | Set            | "new HashSet()"

                    def inputFiles = visitor.fileProperties*.propertyFiles*.files.flatten()
                    assert inputFiles.empty
                }
            }

            task customTask(type: CustomTask) {
                input = null
            }
        """

        expect:
        succeeds "customTask"

        where:
        annotation << [InputFile, InputDirectory, InputFiles]
    }

        def changes = [
            inputProperty: { String property ->
                inputProperties[property] = inputProperties[property] + ' changed'
            },
            inputFile: { String property ->
                inputFiles[property] << ' changed'
            },
            outputFile: { String property ->
                outputFiles[property] << ' changed'
            }
        ]

            }
        }
    }

    def "single root file are represented as roots"() {
        given:
        withBuildCache()
        file('inputFile').text = 'inputFile'
        buildScript """
            task copy(type:Copy) {
               from 'inputFile'
               into 'destDir'
            }
        """
        when:
        succeeds("copy")

        then:

                    return "an input to $workDisplayName has changed"
                }
            }
            is ConfigurationCacheFingerprint.InputFile -> input.run {
                return when (checkFileUpToDateStatus(file, hash)) {
                    FileUpToDateStatus.ContentsChanged -> "file '${displayNameOf(file)}' has changed"