51 lines
1.7 KiB
Python
51 lines
1.7 KiB
Python
# Copyright 2016 Red Hat, Inc
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# Copyright 2017 Rackspace Australia
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import six
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import tempfile
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import nova.privsep.path
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from nova import test
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class LastBytesTestCase(test.NoDBTestCase):
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"""Test the last_bytes() utility method."""
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def setUp(self):
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super(LastBytesTestCase, self).setUp()
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self.f = six.BytesIO(b'1234567890')
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def test_truncated(self):
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self.f.seek(0, os.SEEK_SET)
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out, remaining = nova.privsep.path._last_bytes_inner(self.f, 5)
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self.assertEqual(out, b'67890')
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self.assertGreater(remaining, 0)
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def test_read_all(self):
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self.f.seek(0, os.SEEK_SET)
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out, remaining = nova.privsep.path._last_bytes_inner(self.f, 1000)
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self.assertEqual(out, b'1234567890')
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self.assertFalse(remaining > 0)
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def test_seek_too_far_real_file(self):
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# StringIO doesn't raise IOError if you see past the start of the file.
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with tempfile.TemporaryFile() as flo:
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content = b'1234567890'
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flo.write(content)
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self.assertEqual(
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(content, 0),
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nova.privsep.path._last_bytes_inner(flo, 1000))
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