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(Andrew Bennetts, Robert Collins) Create a new test helper start_bzr_subprocess which is paired with finish_bzr_subprocess, allowing tests that need to interact with the upcoming bzr serve command.

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bzrlib/builtins.py
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            pass
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class cmd_wait_until_signalled(Command):
 
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    """Test helper for test_start_and_stop_bzr_subprocess_send_signal.
 
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    This just prints a line to signal when it is ready, then blocks on stdin.
 
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    """
 
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    hidden = True
 
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    def run(self):
 
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        sys.stdout.write("running\n")
 
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        sys.stdout.flush()
 
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        sys.stdin.readline()
 
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# command-line interpretation helper for merge-related commands
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def merge(other_revision, base_revision,