c#

这是我在 XUnit 中的测试方法。

    [Fact]
    public async Task AddCampaign_ReturnBadRequestWhenDateIsInvalid()
    {
        var client = _factory.CreateClient();
        string title = string.Format("Test Add Campaign {0}", Guid.NewGuid());
        var campaignAddDto = new CampaignDTORequest
        {
            Title = title
        };
        var encodedContent = new StringContent(JsonConvert.SerializeObject(campaignAddDto), Encoding.UTF8, "application/json");

        var response = await client.PostAsync("/api/Campaign/add", encodedContent);
        var responseString = await response.Content.ReadAsStringAsync();
        var result = JsonConvert.DeserializeObject<CampaignDTOResponse>(responseString);

        Assert.False(response.IsSuccessStatusCode);
        Assert.ThrowsAsync<ArgumentNullException>(()=> client.PostAsync("/api/Campaign/add", encodedContent));
    }

第一个断言是有效的。我坚持第二个断言。如何断言异常类型 (ArgumentNullException) 及其异常消息？

这是服务方法

    public async Task<Campaign> AddCampaignAsync(Campaign campaign)
    {            
        if (campaign.StartDate.Equals(DateTime.MinValue)) {
            throw new ArgumentNullException("Start Date cannot be null or empty.");
        }
        
        await _context.Campaigns.AddAsync(campaign);
        await _context.SaveChangesAsync();
        return campaign;
    }

根据雷洋的线索更新。

var exceptionDetails = Assert.ThrowsAsync<ArgumentNullException>(() => client.PostAsync("/api/Campaign/add", encodedContent));
Assert.Equal("Start Date cannot be null or empty.", exceptionDetails.Result.Message);

但仍然不起作用。

System.AggregateException ：发生一个或多个错误。(Assert.Throws() 预期失败：typeof(System.ArgumentNullException) 实际：(没有抛出异常))

尝试了 Dai 的解决方案，但仍然出错。

Assert.Throws() Failure
Expected: typeof(System.ArgumentNullException)
Actual:   (No exception was thrown)

这是我的 API 方法。

 public async Task<ActionResult<CampaignDTOResponse>> AddCampaign([FromBody] CampaignDTORequest newCampaign)
    {
        try
        {
            var campaign = _mapper.Map<Campaign>(newCampaign);
            campaign = await _campaignService.AddCampaignAsync(campaign);
            var campaignDtoResponse = _mapper.Map<CampaignDTOResponse>(campaign);
            return CreatedAtAction(nameof(GetCampaignById), new { id = campaignDtoResponse.Id }, campaignDtoResponse);
        }
        catch (Exception ex)
        {
            _logger.LogError(0, ex, ex.Message);
            return Problem(ex.Message);
        }
    }

更新：我将检查从服务转移到 api。

if (newCampaign.StartDate.Equals(DateTime.MinValue))
{
    return BadRequest("Start Date cannot be null or empty.");
}

我像下面那样断言它们。

Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
Assert.Equal("Start Date cannot be null or empty.", responseString);

回答

[Fact]
public async Task AddCampaign_Return_bad_request_when_date_is_invalid()
{
    [...]

    Assert.False(response.IsSuccessStatusCode);
    await Assert.ThrowsAsync<ArgumentNullException>(()=> client.PostAsync("/api/Campaign/add", encodedContent));
}