Test failure with geos 3.9.0

[hjaekel]

Expected behavior and actual behavior.

The test SvgTestCase.test_collection fails for Shapely 1.7.1 with geos 3.9.0.

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FAIL: test_collection (tests.test_svg.SvgTestCase)
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Traceback (most recent call last):
  File "/home/builder/package/community/py3-shapely/src/Shapely-1.7.1/tests/test_svg.py", line 176, in test_collection
    self.assertSVG(
  File "/home/builder/package/community/py3-shapely/src/Shapely-1.7.1/tests/test_svg.py", line 41, in assertSVG
    self.assertEqual(svg_elem, expected)
AssertionError: '<g><polyline fill="none" stroke="#66cc99" str[158 chars]</g>' != '<g><circle cx="7.0" cy="3.0" r="3.0" stroke="[158 chars]</g>'
- <g><polyline fill="none" stroke="#66cc99" stroke-width="2.0" points="4.0,2.0 8.0,4.0" opacity="0.8" /><circle cx="7.0" cy="3.0" r="3.0" stroke="#555555" stroke-width="1.0" fill="#66cc99" opacity="0.6" /></g>
+ <g><circle cx="7.0" cy="3.0" r="3.0" stroke="#555555" stroke-width="1.0" fill="#66cc99" opacity="0.6" /><polyline fill="none" stroke="#66cc99" stroke-width="2.0" points="4.0,2.0 8.0,4.0" opacity="0.8" /></g>

So just the order of the polyline and the circle in the SVG changed.

Steps to reproduce the problem.

Use python3 setup.py build

Operating system

Alpine Linux Edge

Shapely version and provenance

Shapely 1.7.1

[jorisvandenbossche]

Yes, the coordinate pair order has changed for several operations in GEOS 3.9.0, and hence causing some failures in existing tests.
This has been fixed in the meantime: #1042 (note that it is only the test itself that failed due to a slightly changed expected result, there is no actualy runtime failure when using Shapely 1.7 with GEOS 3.9.0)

[sgillies]

@jorisvandenbossche thanks for the explanation! @hjaekel there will be a fix when 1.8.0 is released. That's a little ways out yet.