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Prevent dot_path tests from corrupting the stored path. #2220

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Prevent dot_path tests from corrupting the stored path. #2220

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7 changes: 6 additions & 1 deletion lib/iris/tests/unit/fileformats/dot/test__dot_path.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@

import mock

from iris.fileformats.dot import _dot_path
from iris.fileformats.dot import _dot_path, _DOT_EXECUTABLE_PATH


class Test(tests.IrisTest):
Expand All @@ -37,6 +37,11 @@ def setUp(self):
# reset the caching status to allow us to see what happens
# under different circumstances.
self.patch('iris.fileformats.dot._DOT_CHECKED', new=False)
# Also patch the private path variable to the existing value (i.e. no
# change), and restore it after each test: As these tests modify it,
# that can potentially break subsequent 'normal' behaviour.
self.patch('iris.fileformats.dot._DOT_EXECUTABLE_PATH',
_DOT_EXECUTABLE_PATH)

def test_valid_absolute_path(self):
# Override the configuration value for System.dot_path
Expand Down