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Expecter Gadget, a better expectation (assertion) library

Project description

======
BASICS
======

Expecter Gadget helps you to write assertions. Never again will you forget
which is expected and which is actual!

Basic expectations are easy:

>>> from expecter import expect
>>> expect('some' + 'thing') == 'something'
expect('something')
>>> expect(1) > 100
Traceback (most recent call last):
...
AssertionError: Expected something greater than 100 but got 1

Just read the expectations like a sentence. "expect(2) == 1 + 1" reads as
"Expect 2 to equal 1 + 1". Obviously, the expectation is about 2, and it's
being compared to 1 + 1. No ambiguity!

==========
EXCEPTIONS
==========

Expectations about exceptions use the "with" statement. Everything is good if
the expected exception is raised:

>>> from __future__ import with_statement
>>> with expect.raises(KeyError):
... {}[123]

If it's not raised, Expecter Gadget will raise an AssertionError:

>>> with expect.raises(KeyError):
... pass
Traceback (most recent call last):
...
AssertionError: Expected an exception of type KeyError but got none

Exceptions that don't match the expected one will not be swallowed, so your
test will error as you expect:

>>> from __future__ import with_statement
>>> with expect.raises(NameError):
... {}[123]
Traceback (most recent call last):
...
KeyError: 123

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