使用try/catch时单元测试失败

Question

我需要测试是否确实引发了Argument Exception。真的有可能理解方法中的异常是caughtt吗？

    public JsonResult Create(TeamViewModel teamViewModel)
    {
        JsonResult result = null;
            try
            {
                // here exception throws
                var domainTeam = teamViewModel.ToDomain();
                  ...
            }
            catch (ArgumentException ex)
            {
                this.ModelState.AddModelError(string.Empty, ex.Message);
                result = this.Json(this.ModelState);
            }           
        return result;
    }

这种方法的我的单元测试：

 public void Create_InvalidTeamAchievements_ArgumentExceptionThrown()
 {
    Exception exception = null;
    string invalidAchievements = CreateInvalidTeamAchievements();
    // Arrange
    var viewModel = new TeamMvcViewModelBuilder().WithAchievements(invalidAchievements).Build();
    var sut = _kernel.Get<TeamsController>();
    // Act
    try
    {
        sut.Create(viewModel);
    }
    catch (ArgumentException ex)
    {
        exception = ex;
    }
    // Assert
    VerifyExceptionThrown(exception, string.Format(Resources.ValidationTeamAchievements, 
                Constants.Team.MAX_ACHIEVEMENTS_LENGTH));
}

Answer 1

您的测试方式不对。应该测试功能以避免抛出异常，因为您已经在Create方法中捕获到异常。相反，您应该断言包含ModelState的JsonResult中应该有错误，以防在Create方法中引发异常。