c# - 我想检查单元测试是否抛出了正确的业务异常？

Question

这是我在 Controller 中的方法。

public ActionResult DeleteModelAliasData(string alias)
{
    if (!ModelState.IsValid)
    {
        ModelState.LogModelStateError();
        throw new BusinessException("COMMON_ERROR");
    }

    var response = _vehicleDataBusinessService.DeleteModelAliasData(alias);
    return Json(response);
}

我是单元测试的新手，我想编写单元测试，当“!ModelState.IsValid”抛出异常时，我想检查它是否是正确的异常我想要？

Answer 1

您可以按照下面的代码执行相同的操作。

 var ex = Assert.Throws<BusinessException>(() => controller.DeleteModelAliasData(alias));
 Assert.That(ex.Message, Is.EqualTo("COMMON_ERROR"));

引用: NUnit Exception Asserts

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更新:

[Test]
public void TestDeleteModelAliasData()
{
    // Get your controller instance - you know it better how to instantiate
    var controller = GetControllerInstance();

    // Add error message to ModelState
    controller.ModelState.AddModelError("PropertyName", "Error Message");

    var alias = "sampleAlias";

    // As ModelState is having an Error, the method should throw BusinessException
    var ex = Assert.Throws<BusinessException>(() => controller.DeleteModelAliasData(alias));

    // Exception is raised, assert the message if you want
    Assert.That(ex.Message, Is.EqualTo("COMMON_ERROR"));
}