fun hashCodeOf(file: File): HashCode?
        fun hashCodeOfDirectoryContent(file: File): HashCode?
        fun displayNameOf(fileOrDirectory: File): String
        fun instantiateValueSourceOf(obtainedValue: ObtainedValue): ValueSource<Any, ValueSourceParameters>
        fun isRemoteScriptUpToDate(uri: URI): Boolean
    }

    suspend fun ReadContext.checkBuildScopedFingerprint(): CheckedFingerprint {

        override fun displayNameOf(fileOrDirectory: File): String =
            GFileUtils.relativePathOf(fileOrDirectory, rootDirectory)

        override fun instantiateValueSourceOf(obtainedValue: ObtainedValue) =
            (host.valueSourceProviderFactory as DefaultValueSourceProviderFactory).instantiateValueSource(
                obtainedValue.valueSourceType,

        }

        val obtainedValue = obtainedValueMock()

        // expect:
        assertThat(
            checkFingerprintGiven(
                mock {
                    on { instantiateValueSourceOf(obtainedValue) } doReturn describableValueSource
                },
                ConfigurationCacheFingerprint.ValueSource(obtainedValue)
            ),
            equalTo("my value source has changed")