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Verify that *candidate* might correctly provide *iface*.
This involves:
- Making sure the candidate claims that it provides the
interface using ``iface.providedBy`` (unless *tentative* is `True`,
in which case this step is skipped). This means that the candidate's class
declares that it `implements <zope.interface.implementer>` the interface,
or the candidate itself declares that it `provides <zope.interface.provider>`
the interface
- Making sure the candidate defines all the necessary methods
- Making sure the methods have the correct signature (to the
extent possible)
- Making sure the candidate defines all the necessary attributes
:return bool: Returns a true value if everything that could be
checked passed.
:raises zope.interface.Invalid: If any of the previous
conditions does not hold.
.. versionchanged:: 5.0
If multiple methods or attributes are invalid, all such errors
are collected and reported. Previously, only the first error was reported.
As a special case, if only one such error is present, it is raised
alone, like before.
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