Python unittest - opposite of assertRaises?

I want to write a test to establish that an Exception is not raised in a given circumstance.

It's straightforward to test if an Exception is raised ...

sInvalidPath=AlwaysSuppliesAnInvalidPath()
self.assertRaises(PathIsNotAValidOne, MyObject, sInvalidPath) 

... but how can you do the opposite.

Something like this i what I'm after ...

sValidPath=AlwaysSuppliesAValidPath()
self.assertNotRaises(PathIsNotAValidOne, MyObject, sValidPath) 

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