Website: describe how to expect exceptions

[BrainCrumbz]

Website makes no mention of how to assert when examples should throw, by using expect<>

[amirrajan]

That should be documented, and also this: #59

class describe_something : nspec
{
    SomeObject someObject;
    void a_context()
    {
        expect_an_exception(
            "it throws an exception", 
            () => someObject.DoSomething(), 
            ex => someObject.Flag.should_be(false));

        expect_an_exception(
            "another test",
            () => someObject.DoSomethingElse(), 
            ex => someObject.Flag.should_be(false));
    }

    void expect_an_exception(string testName, Action actionThatThrows, Action<Exception> assertAfter)
    {
        it[testName] = () => 
        {
            bool exceptionThrown = false;
            try
            {
                actionThatThrows();
            }
            catch(Exception ex)
            {
                exceptionThrown = true;
                assertAfter(ex);
            }

            if(!exceptionThrown) throw new InvalidOperationException("exception was not thrown when expected");
        };
    }
}

[BrainCrumbz]

Closed by b9e0ec3 with both descriptions