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[Raphaël Badin <raphael.badin@xxxxxxxxxxxxx>]

> Thanks for the patch, Raphaël.
> 
> I don't quite understand the matcher though.  From the docstring and the name,
> I would have guess something like this::
> 
>   self.assertThat([1, 2, 3], ContainsAll([3, 1]))
> 
> That is, self.assertThat(Y, ContainsAll(X)) would pass if and only if X is a
> subset of Y.

Indeed, that's precisely what this matcher does.  Again, it's simply a shortcut, it uses existing functionality.
 
> As it is, self.assertThat(Y, ContainsAll(X)) passes iff for all y in Y, for
> all x in X, x in y.  (i.e. ∀ y ∊ Y, ∀ x ∊ X, 'x in y')

Maybe I'm missing something but that's not what this matcher does.  I can't resist using these nice utf8 characters:
self.assertThat(y, ContainsAll(X)) passes iff for all x in X, x in y.  (i.e. ∀ x ∊ X, 'x in y')
-- 
https://code.launchpad.net/~rvb/testtools/testtools-contains-all/+merge/104065
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