[Tests] Use LIBC_FATAL_STDERR_=1 in tests
By default, libc will print fatal errors to /dev/tty instead of stderr. Adding the LIBC_FATAL_STDERR_ to the environment variables allows us to catch libc errors in stderr and test for them.
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@ -143,7 +143,12 @@ class TestNode():
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# unclean shutdown), it will get overwritten anyway by bitcoind, and
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# unclean shutdown), it will get overwritten anyway by bitcoind, and
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# potentially interfere with our attempt to authenticate
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# potentially interfere with our attempt to authenticate
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delete_cookie_file(self.datadir)
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delete_cookie_file(self.datadir)
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self.process = subprocess.Popen(self.args + extra_args, stdout=stdout, stderr=stderr, *args, **kwargs)
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# add environment variable LIBC_FATAL_STDERR_=1 so that libc errors are written to stderr and not the terminal
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subp_env = dict(os.environ, LIBC_FATAL_STDERR_="1")
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self.process = subprocess.Popen(self.args + extra_args, env=subp_env, stdout=stdout, stderr=stderr, *args, **kwargs)
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self.running = True
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self.running = True
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self.log.debug("bitcoind started, waiting for RPC to come up")
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self.log.debug("bitcoind started, waiting for RPC to come up")
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