XUnit Assert.IsType() 具有多种预期类型

Question

我需要检查三种可能的异常类型中的一种。如果其中之一被抛出，测试应该成功完成。我在几种情况下使用 [Theory] 和 [MemberData]。

[Theory]
[MemberData(nameof(GetInvalidMimeMessages))]
public async Task ProcessAsync_TestFail(MimeMessage message)
{
    var stub = Mock.Of<IOptions<ScrapyardFilesOptions>>(s => s.Value.ConnectionString == "UseDevelopmentStorage=true" && s.Value.Container == "exchange");
    var loggerMock = new Mock<ILogger<ScrapyardFilesHandler>>(MockBehavior.Loose);
    var scrapyard = new ScrapyardFilesHandler(loggerMock.Object, stub);
    var ex = await Assert.ThrowsAnyAsync<Exception>(() => scrapyard.ProcessAsync(message));

    // imagine solution somehow like that
    Assert.IsType( 
                    { 
                      typeof(NullReferenceException)    ||
                      typeof(KeyNotFoundException)      ||
                      typeof(InvalidOperationException) ||
                    },
                    ex); 
}

private static IEnumerable<object[]> GetInvalidMimeMessages()
{
    yield return new object[] { null };
    yield return new object[] { new MimeMessage() };
    yield return new object[]
    {
        new MimeMessage(
            new List<InternetAddress>(),
            new InternetAddressList() { new MailboxAddress("ExchangeScrapyard@ol.su"), new MailboxAddress("exchange+scrapyard@Olex.su"), },
            string.Empty,
            MimeEntity.Load(ParserOptions.Default, Stream.Null))
    };
    yield return new object[]
    {
        new MimeMessage(
            new List<InternetAddress>(),
            new InternetAddressList() { new MailboxAddress("ExchangeOLC449@ol.su"), new MailboxAddress("exchange+olc@Ol.su"), },
            string.Empty,
            MimeEntity.Load(ParserOptions.Default, Stream.Null))
    };
}

我怎样才能得到这样的断言？

Answer 1

由于您有多个可能的异常要抛出，因此 NUnit 中没有内置的方法来检查它。如果你只需要一个例外，你可以使用这个：

Assert.Throws<NullReferenceException>(() => DoSomething);

但是对于多个你可以使用旧的 try-catch:

try
{
    DoSomething();
}
catch(NullReferenceException) { Assert.Pass(); }
catch(KeyNotFoundException) { Assert.Pass(); }
catch(InvalidOperationException) { Assert.Pass(); }
catch(Exception) { Assert.Fail("Unexpected exception was caught"); }
Assert.Fail("No exception was caught");

Answer 2

var exceptions = new List<Type>()
            {
                typeof(NullReferenceException),
                typeof(KeyNotFoundException),
                typeof(InvalidOperationException),
            };

var ex = await Assert.ThrowsAnyAsync<Exception>(() => foo.Bar());
Assert.Contains(ex.GetType(), exceptions);

XUnit Assert.IsType() 具有多种预期类型

XUnit Assert.IsType() with multiple expected types

c#

unit-testing

xunit.net

.net-core