使用Mox测试功能链中的多个API调用

时间:2018-08-03 15:30:20

标签: elixir mox

我正在尝试测试是否正确转换了从第三方api返回的数据。我在使用Mox时遇到了一些麻烦,因为在数据转换过程中需要击中两个单独的端点。让我通过发布代码来更清楚地解释:

测试:

  test "players/0 return all active players" do
    Statcasters.SportRadarNbaApi.ClientMock
    |> expect(:league_hierarchy, fn ->
      {:ok, league_hierarchy_map()}
    end)

    Statcasters.SportRadarNbaApi.ClientMock
    |> expect(:team_profile, fn _ ->
      {:ok, team_profile_map()}
    end)


    assert Statcasters.Sports.Nba.get_players() == ["Kevon Looney", "Patrick McCaw"]
  end

代码:

  def get_players do
    with {:ok, hierarchy} <- @sport_radar_nba_api.league_hierarchy,
         team_ids <- get_team_ids(hierarchy),
         players <- get_team_players(team_ids)
    do
      IO.inspect players
    end
  end

  defp get_team_players(team_ids) do
    for team_id <- team_ids do
      {:ok, team} = @sport_radar_nba_api.team_profile(team_id)
    end
  end

忽略以下事实:编写的代码实际上不会通过测试。我正试图找出这是测试失败。

问题:

第二个api调用team_profile在测试中被调用了两次,因为我迭代了两个team_ids,并且每个team_id都调用了API。这是预料之中的,但测试并未为此准备,因为我遇到了此错误。

错误:

** (Mox.UnexpectedCallError) expected Statcasters.SportRadarNbaApi.ClientMock.team_profile/1 to be called once but it has been called 2 times in process #PID<0.410.0>

这是正确的。我确实调用了两次,但是如何设置测试以期望该API端点将被调用两次?

1 个答案:

答案 0 :(得分:3)

third optional argument to expect是应调用模拟函数的次数。在这种情况下,只需将其设置为2

Statcasters.SportRadarNbaApi.ClientMock
|> expect(:team_profile, 2, fn _ ->
  {:ok, team_profile_map()}
end)