}

  @Test
  fun keyWithSpaceNotPermitted() {
    assertFailsWith<IllegalArgumentException> {
      cache.edit("my key")
    }
  }

  @Test
  fun keyWithNewlineNotPermitted() {
    assertFailsWith<IllegalArgumentException> {
      cache.edit("my\nkey")
    }
  }

  @Test
  fun keyWithCarriageReturnNotPermitted() {
    assertFailsWith<IllegalArgumentException> {