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Tests for C{yield from} support in Deferreds.
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Tests for using Deferreds in conjunction with PEP-380.
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L{ensureDeferred} will turn a coroutine into a L{Deferred}.
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L{Deferred.fromCoroutine} will turn a coroutine into a L{Deferred}.
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L{Deferred.fromCoroutine} allows a function to C{yield from} a
L{Deferred}.
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An exception in a generator scheduled with L{Deferred.fromCoroutine}
will cause the returned L{Deferred} to fire with a failure.
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Yielding from an already failed Deferred will raise the exception.
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Yielding from a paused & chained Deferred will give the result when it
has one.
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