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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 23 May 2011 16:46:52 -0600
Subject: Re: Unit testing beginner question
To: Andrius <andrius.a@gmail.com>
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:6101

On Mon, May 23, 2011 at 4:30 PM, Andrius <andrius.a@gmail.com> wrote:
> and I am expecting test to pass, but I am getting exception:
> Traceback (most recent call last):
> =A0 =A0self.assertRaises(TypeError, self.testListNone[:1])
> TypeError: 'NoneType' object is unsubscriptable
>
> I thought that assertRaises will pass since TypeError exception will
> be raised?

The second argument to assertRaises must be a function that
assertRaises will call.  assertRaises can't catch the error above
because it is raised when the argument is evaluated, before
assertRaises has even been called.

This would work:

self.assertRaises(TypeError, lambda: self.testListNone[:1])

Cheers,
Ian