[TIP] Announcing Expecter Gadget
marius at gedmin.as
Sun Mar 7 06:27:15 PST 2010
On Sat, Mar 06, 2010 at 07:15:26PM -0800, Gary Bernhardt wrote:
> I've recently released Expecter Gadget, an expectation (assertion)
I've seen that name in the nose-achievements plugin page, now I know
what it is!
> It provides a nicer syntax than bare asserts or
> assertEquals-style functions (IMO). It provides this syntax:
> expect(my_number) == 5
> It supports all of the comparison operators [...]
All of them? Let's try this:
>>> from expecter import expect
>>> 1 < expect(2) < 3
>>> 1 < expect(4) < 3
Bug? Going past the other end works fine:
>>> 1 < expect(0) < 3
Traceback (most recent call last):
AssertionError: Expected something greater than 1 but got 0
Incidentally, a < expect(x) < b doesn't scan nicely when you read it out
loud in English. expect(x).between(a, b) is better, but raises
questions about closed vs open vs half-open intervals. How would you
write an assertion like this?
Unix is the answer, but only if you phrase the question very carefully.
-- Belinda Asbell
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