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Tests for implementations of L{IReactorProcess}.
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    Base class for L{IReactorProcess} tests which defines some tests which
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        L{IReactorProcess.spawnProcess} connects the protocol passed to it
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        Helper for testing L{IProcessTransport} write functionality.  This
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        If, before the reactor is started with L{IReactorCore.run}, a
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        If a child process exits while a system call is in progress, the system
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