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49 lines
1.6 KiB
49 lines
1.6 KiB
# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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import os
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import sys
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import tempfile
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from contextlib import contextmanager
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class Capture():
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def start(self):
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self._old_stdout = sys.stdout
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self._stdout_fd = self._old_stdout.fileno()
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self._saved_stdout_fd = os.dup(self._stdout_fd)
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self._file = sys.stdout = tempfile.TemporaryFile(mode='w+t')
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self.output = ''
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os.dup2(self._file.fileno(), self._stdout_fd)
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def stop(self):
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os.dup2(self._saved_stdout_fd, self._stdout_fd)
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os.close(self._saved_stdout_fd)
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sys.stdout = self._old_stdout
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self._file.seek(0)
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self.output = self._file.read()
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self._file.close()
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@contextmanager
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def capture(cap):
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cap.start()
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try:
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yield cap
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finally:
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cap.stop()
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def check_output(output, patterns):
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assert output, "Capture output failed!"
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for pattern in patterns:
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assert output.find(pattern) != -1, "Unexpected output:\n" + output + "\n--- pattern ---\n" + pattern
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