Puppet users - May 2013 - Rspec-puppet: what is differences between contain_class, include_class, create_class?

Hello, everyone!
Does anyone can tell me about differences (or help to find any document or 
source code with the answer) between functions:
* contain_class
* include_class
* create_class 

Which one is preferred in which cases?

Thank you, in advance.

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I looked at rspec-puppet sources and found that there is only one matcher 
exists: *include_class*

So, I assume that *contain_class* and *create_class* are not part of the 
rspec-puppet and *should not be used*. (maybe, they''re some Ruby
functions,
or some matchers, that came from RSpec).

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