func testKittenCellHasDisclosureIndicatorWhenAdoptable() {
  dataSource.kittens.first?.isAdoptable = true

  guard let firstKitten = dataSource.kittens.first,
    firstKitten.isAdoptable else {
    return XCTFail("First kitten in dataSource should be adoptable")
  }

  let cell = dataSource.tableView(tableView, cellForRowAt: IndexPath(row: 0, section: 0))
  XCTAssertEqual(cell.accessoryType, .disclosureIndicator,
                 "Cell should have disclosure indicator for adoptable kitten")
}