// On all platforms files are deleted when all sources are closed.
      snapshot1.assertValue(1, "a")
      assertThat(readFileOrNull(getCleanFile("k1", 0))).isNull()
      assertThat(readFileOrNull(getDirtyFile("k1", 0))).isNull()
    }
  }

  @ParameterizedTest
  @ArgumentsSource(FileSystemParamProvider::class)