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Diffstat (limited to 'dev-python/pydot/files/pydot-1.4.1-unittest.patch')
-rw-r--r--dev-python/pydot/files/pydot-1.4.1-unittest.patch74
1 files changed, 74 insertions, 0 deletions
diff --git a/dev-python/pydot/files/pydot-1.4.1-unittest.patch b/dev-python/pydot/files/pydot-1.4.1-unittest.patch
new file mode 100644
index 000000000000..b3c0d0e426b5
--- /dev/null
+++ b/dev-python/pydot/files/pydot-1.4.1-unittest.patch
@@ -0,0 +1,74 @@
+From a10ced4d132361027a545a471af4541dea8c5cf5 Mon Sep 17 00:00:00 2001
+From: Peter Nowee <peter@peternowee.com>
+Date: Wed, 26 Jun 2019 15:43:38 +0800
+Subject: [PATCH] Fix multi.dot Graphviz regression test
+
+Commit d6602ad of 2018-12-01 fixed the regression test broken by commit
+2d55978 of 2016-07-01. This revealed that `test/graphs/multi.dot` was
+failing.
+
+`multi.dot` was introduced in commit 2b3f088 of 2010-11-07 together
+with many of the other tests still here today. It has not been touched
+since. It is a DOT-file containing two digraphs. The regression test
+compares the JPEG images rendered from the DOT-file by pydot with those
+rendered by Graphviz's dot directly.
+
+Commit 66734d2 of 2016-07-01 is the actual cause of the failure. It
+changed one of the render methods of the regression test,
+`_render_with_pydot`, from calculating a single hash for all the JPEG
+images to calculating separate hashes for each JPEG image and then
+concatenating those hashes in one long string. The other render method,
+`_render_with_graphviz`, still calculates a single hash over all data.
+For DOT-files that generate only one image the end result is the same,
+but because `multi.dot` has two graphs, it produces two images and this
+leads to comparing a string of two hashes with one single hash.
+
+I do not think the change in generating the hash was intentional, for
+the following reasons:
+- Commit 66734d2 states that its purpose was to adapt the test to an
+ API change in pydot. It does not mention a deliberate choice to
+ change the testing method.
+- There was no effort to change `_render_with_graphviz` to also produce
+ multiple hashes.
+- Except for easier debugging in case of a failing test with multiple
+ images (AFAICT, only `multi.dot`), I do not see much added benefit in
+ checking a concatenation of the hashes of all images vs. checking one
+ hash of all images together: In both cases the test will fail if one
+ or more images is rendered differently.
+- Given that there were many commits authored that same hour, including
+ commit 2d55978 which broke the regression tests, I suspect the author
+ did not run the tests for each individual commit, but only at the end
+ of that batch, and was therefore also not alerted of this change by
+ the test suite.
+
+Assuming that the change was not intended, this commit will now revert
+`_render_with_pydot` to the old behavior of calculating a single hash
+from all JPEG image data.
+
+Tested with Debian 9.9, Graphviz 2.38.0-17, Python 2.7.13-2 and 3.5.3-1.
+
+Fixes https://github.com/pydot/pydot/issues/204.
+---
+ test/pydot_unittest.py | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/test/pydot_unittest.py b/test/pydot_unittest.py
+index 881ee16..64aa856 100644
+--- a/test/pydot_unittest.py
++++ b/test/pydot_unittest.py
+@@ -194,11 +194,11 @@ def _render_with_graphviz(self, filename, encoding):
+
+ def _render_with_pydot(self, filename, encoding):
+ c = pydot.graph_from_dot_file(filename, encoding=encoding)
+- sha = ''
++ jpe_data = bytearray()
+ for g in c:
+- jpe_data = g.create(prog=TEST_PROGRAM, format='jpe', encoding=encoding)
+- sha += sha256(jpe_data).hexdigest()
+- return sha
++ jpe_data.extend(g.create(prog=TEST_PROGRAM, format='jpe',
++ encoding=encoding))
++ return sha256(jpe_data).hexdigest()
+
+ def test_my_regression_tests(self):
+ path = os.path.join(test_dir, TESTS_DIR_1)