我们如何使用 StoryQ 来测试预期出现异常的场景?
最佳答案
就实际代码而言,在测试代码的 .Then
部分,您需要创建一个 Action
或 Func
来确定正在测试的内容,然后在代码的 .Then
部分,您将调用该代码并测试结果。例如:
[Test]
public void AnIllegalOperationThrowsAnException()
{
new Story("My Story)
.InOrderTo("Do achieve something")
.AsA("User")
.IWant("To carry out an operation")
.WithScenario("an exception occurs")
.Given(InitialConditions)
.When(TheIllegalActionIsTaken)
.Then(AnIllegalOperationExceptionIsThrown);
}
private void InitialConditions()
{
}
private Func<string> _operation;
private void TheIllegalActionIsTaken()
{
_operation = () => return MyTestClass.DoesSomethingWrong();
}
private void AnIllegalOperationExceptionIsThrown()
{
try
{
_operation.Invoke();
Assert.Fail("An exception should have been thrown");
}
catch (Exception ex)
{
Assert.That(ex, Is.InstanceOf<IllegalOperationException>(), "The wrong exception was thrown");
Assert.That(ex.Message, Is.EqualTo("Ooops!");
}
}
断言处理可能会稍微整理一下,尤其是您的测试方法没有返回值。例如,FluentAssertions 库可以很好地与 Action(但不是 Func)一起工作,因此代码将是:
_action.ShouldThrow<IllegalOperationException>().WithMessage("Ooops!");
关于bdd - 预期异常的 StoryQ 场景,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4275539/