Question

我正在尝试编写单元测试来测试控制器的动作之一ShareWorkbook。如果上述操作发生异常，测试应该检查是否将用户发送到一般错误页面（在Startup.cs中定义）。但是，由于我的硬编码异常，目前我的单元测试失败。我知道我的测试检查用户是否已重定向到错误页面，但是该异常破坏了单元测试（请参阅下面的异常），是否有一种解决方法，以便忽略异常并通过测试？

这是我的 HomeController 和我要测试的操作：

public class HomeController : Controller
{
...

[HttpPost]
[ValidateAntiForgeryToken]
public IActionResult ShareWorkbook(string emails, string title, string workbookId)
    {
        var emailStrArr = Regex.Split(emails, Constants.SplitPattern).ToList();

        var workbookShareModel = new WorkbookShareModel
        {
            WorkbookId = workbookId,
            Title = title,
            Emails = emailStrArr
        };

        // check to see if the 'WorkbookShareModel' is valid (takes into account its property DataAnnotation)
        if (TryValidateModel(workbookShareModel))
        {
            try
            {
                ShareWorkbook(workbookShareModel);
            }
            catch (Exception e)
            {
                _logger.LogException(e, e.Message);
                throw;
            }
        }

        // return no content to avoid page refresh
        return NoContent();
    }

    private void ShareWorkbook(WorkbookShareModel workbookShareModel)
    {
       // MOCK SERVICE
        _workbookManagementService.ShareWorkbook(workbookShareModel);
    }
}

当前，我在MockService中添加了一个硬编码异常：

public class MockManagementService : IManagementService
{
    public void ShareWorkbook(WorkbookShareModel sharedWorkbook)
    {
        if (string.IsNullOrEmpty(sharedWorkbook.WorkbookId))
            throw new Exception("Couldn't share workbook");
    }
}

我得到的异常（预期）：

System.Exception : Couldn't share workbook
   at Project.Test.Services.MockManagementService.ShareWorkbook(WorkbookShareModel sharedWorkbook) in D:\_JustCodeHere\Apps\ProjectCore\ProjectCore.Test\Services\MockManagementService.cs:line 27

那是我的单元测试：

public class HomeControllerTest
{
    [Fact]
    public void error_page_is_shown_if_exception_occurs_during_workbook_sharing_process()
    {
        // Arrange
        var workbookService = new MockManagementService();
        var mockLogger = new Mock<ILogger>();
        var controller = new HomeController(null, null, workbookService, mockLogger.Object);
        controller.ObjectValidator = new TestingObjectValidator();

        // Act
        // passing 'null' for the workbookId parameter raises an exception
        var result = controller.ShareWorkbook("test@email.com", "workbook title", null);

        // Assert
        var redirectToActionResult = Assert.IsType<RedirectToActionResult>(result);
        Assert.Equal("Error", redirectToActionResult.ActionName);
    }
}

这是我设置错误页面的方式：

public class Startup
{
    ...
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {

    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        app.UseExceptionHandler("/Home/Error");
    }

    ...
    }
}

Answer 1

我最终将控制器操作中的throw;调用替换为return RedirectToAction("Error");。这样，我就可以对用户重定向到这样的页面进行单元测试：

public void error_page_is_shown_if_exception_occurs_during_workbook_sharing_process()
{
    // Arrange
    var emails = "test@email.com";
    var title = "";

    // Act
    // passing 'null' for the workbookId parameter raises an exception
    var result = _controller.ShareWorkbook(emails, title, null);

    // Assert
    var redirectToActionResult = Assert.IsType<RedirectToActionResult>(result);
    Assert.Equal("Error", redirectToActionResult.ActionName);
}

发生异常时如何测试用户是否重定向到错误页面？

1 个答案: