如何在nunit中测试包含本地化日期的异常消息

Question

I've just come across an interesting problem with one of our unit tests. It's a case where we're trying to ensure that when a particular exceptional case is encountered, that we throw and provide a useful message to the handler - the idea is that the handler can just display (or log) that message directly. The problem is when the message contains a date - we want that date to be expressed using the users locale and any overrides that they may have specified on their local system.

The problem arises because we have two different CI infrastructures (don't ask - one development, one release) which for various reasons, actually have two (slightly) different date settings - one passes the test below, while the other uses a (customized) date format similar to "14Jan2014".

[Test]
[ExpectedException(typeof(InvalidOperationException), ExpectedMessage="Invalid date: 14/01/2014")]
public void ExampleTest()
{
    var date = new DateTime(2014, 01, 14);
    throw new InvalidOperationException("Invalid date: " + date.ToString());
}

I am aware of the SetCulture and Culture attributes but I don't believe these will work due to the customized aspect of the date format on the machine. Is it possible to somehow ignore the customised settings and at least use the locale's defaults for the purposes of the test?

Answer 1

代替使用ExpectedException属性，而是重写测试以显式捕获异常并测试消息。

Answer 2

You can explicitly catch the exception as mentioned by @Dave Mackersie in his answer or you can use ExpectedException attribute with exception handler

[ExpectedException(Handler = "HandleException")]

Your test will be

[Test]
[ExpectedException(Handler = "HandleException")]
public void ExampleTest()
{
    var date = new DateTime(2014, 01, 14);
    throw new InvalidOperationException("Invalid date: " + date.ToString());
}

public void HandleException(Exception ex)
{
    if (!(ex is InvalidOperationException))
        Assert.Fail("Unexpected type of exception thrown by method");

    // Compare expected exception message with ex.Message
    // Assert.Fail if they do not match
}