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Commit7285029

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Merge pull request#28784 from QuLogic/better-fallback-tests
Improve fallback font export tests
2 parents39c1d50 +921e49f commit7285029

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13 files changed

+23971
-1224
lines changed

13 files changed

+23971
-1224
lines changed

‎lib/matplotlib/testing/__init__.py

Lines changed: 45 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,13 +1,15 @@
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"""
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Helper functions for testing.
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"""
4-
frompathlibimportPath
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fromtempfileimportTemporaryDirectory
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importitertools
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importlocale
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importlogging
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importos
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frompathlibimportPath
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importstring
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importsubprocess
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importsys
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fromtempfileimportTemporaryDirectory
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importmatplotlibasmpl
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frommatplotlibimport_api
@@ -232,3 +234,44 @@ def is_ci_environment():
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returnTrue
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returnFalse
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def_gen_multi_font_text():
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"""
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Generate text intended for use with multiple fonts to exercise font fallbacks.
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Returns
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-------
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fonts : list of str
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The names of the fonts used to render the test string, sorted by intended
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priority. This should be set as the font family for the Figure or Text artist.
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text : str
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The test string.
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"""
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# These fonts are serif and sans-serif, and would not normally be combined, but that
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# should make it easier to see which glyph is from which font.
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fonts= ['cmr10','DejaVu Sans']
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# cmr10 does not contain accented characters, so they should fall back to DejaVu
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# Sans. However, some accented capital A versions *are* in cmr10 with non-standard
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# glyph shapes, so don't test those (otherwise this Latin1 supplement group would
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# start at 0xA0.)
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start=0xC5
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latin1_supplement= [chr(x)forxinrange(start,0xFF+1)]
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latin_extended_A= [chr(x)forxinrange(0x100,0x17F+1)]
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latin_extended_B= [chr(x)forxinrange(0x180,0x24F+1)]
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count=itertools.count(start-0xA0)
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non_basic_characters='\n'.join(
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''.join(line)
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for_,lineinitertools.groupby(# Replace with itertools.batched for Py3.12+.
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[*latin1_supplement,*latin_extended_A,*latin_extended_B],
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key=lambdax:next(count)//32)# 32 characters per line.
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)
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test_str=f"""There are basic characters
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{string.ascii_uppercase}{string.ascii_lowercase}
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{string.digits}{string.punctuation}
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and accented characters
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{non_basic_characters}
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in between!"""
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# The resulting string contains 491 unique characters. Some file formats use 8-bit
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# tables, which the large number of characters exercises twice over.
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returnfonts,test_str

‎lib/matplotlib/testing/__init__.pyi

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -52,3 +52,4 @@ def ipython_in_subprocess(
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all_expected_backends:dict[tuple[int,int],str],
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)->None: ...
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defis_ci_environment()->bool: ...
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def_gen_multi_font_text()->tuple[list[str],str]: ...

‎lib/matplotlib/testing/compare.py

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -316,7 +316,7 @@ def convert(filename, cache):
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_log.debug("For %s: converting to png.",filename)
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convert=converter[path.suffix[1:]]
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ifpath.suffix==".svg":
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contents=path.read_text()
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contents=path.read_text(encoding="utf-8")
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# NOTE: This check should be kept in sync with font styling in
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# `lib/matplotlib/backends/backend_svg.py`. If it changes, then be sure to
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# re-generate any SVG test files using this mode, or else such tests will
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