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<p class="MsoNormal">Yes it does help. I’m still getting to grips with patching and see it as a last resort if you can’t set the test up a better way. I’ll skip the failing tests for now and see if I can rewrite them.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Though I guess the question now is why does it actually work most of the time?
<span style="font-family:"Segoe UI Emoji",sans-serif">😊</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Sean Gillies <sean.gillies@gmail.com> <br>
<b>Sent:</b> Thursday, April 13, 2023 3:14 PM<br>
<b>To:</b> Jon Morris <Jon.Morris@jbarisk.com><br>
<b>Cc:</b> gdal dev <gdal-dev@lists.osgeo.org><br>
<b>Subject:</b> Re: [gdal-dev] Intermittent failure with Python mocks<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Jon, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The number one gotcha with patching is documented here <a href="https://docs.python.org/3/library/unittest.mock.html#where-to-patch">https://docs.python.org/3/library/unittest.mock.html#where-to-patch</a>. In a nutshell, you have to patch
your own module. I see you're patching gdal in your tests. Patching gdal from your test doesn't do anything, it's too late. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hope this helps!<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Apr 13, 2023, 7:53 AM Jon Morris <<a href="mailto:Jon.Morris@jbarisk.com">Jon.Morris@jbarisk.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I’m getting intermittent fails with our Python unit tests and I wondered if anyone has seen the same issue. I think it’s a race condition where a mock patch is either not applied
at all or maybe applied too slowly so the patched function still has its original return value. It might be a pytest issue, but I’ve now seen it with two different GDAL methods so I’m just curious if anyone has any idea what may be going on.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The first example I reported on Stack Overflow (<a href="https://stackoverflow.com/q/75185263/3182496" target="_blank">https://stackoverflow.com/q/75185263/3182496</a>) and looks
something like this:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;vertical-align:baseline">
<span style="font-size:10.0pt;font-family:"Courier New";border:none windowtext 1.0pt;padding:0cm"> mock_feat_defn = mocker.patch.object(ogr.FeatureDefn, 'GetFieldCount')</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;vertical-align:baseline">
<span style="font-size:10.0pt;font-family:"Courier New";border:none windowtext 1.0pt;padding:0cm"> mock_feat_defn.side_effect = RuntimeError("Some other error message")</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;vertical-align:baseline">
<span style="font-size:10.0pt;font-family:"Courier New";border:none windowtext 1.0pt;padding:0cm"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;vertical-align:baseline">
<span style="font-size:10.0pt;font-family:"Courier New";border:none windowtext 1.0pt;padding:0cm"> with pytest.raises(RuntimeError, match="Some other error message"):</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;vertical-align:baseline">
<span style="font-size:10.0pt;font-family:"Courier New";border:none windowtext 1.0pt;padding:0cm"> get_from_layer_schema(test_lyr, get_names=True, get_types=False)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The second example is this:<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> with mock.patch('osgeo.gdal.Driver.Delete', side_effect=None):</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> with self.assertRaisesRegex(DatasetError, "Could not delete"):</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Courier New""> delete_path(shp_path)</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">In both cases we’re mocking a GDAL method call to check one of our functions correctly raises an error, but sometimes it works and sometimes it doesn’t. If it’s not a GDAL issue,
no problem, I will keep looking elsewhere for a solution.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Jon<o:p></o:p></p>
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