Resolve warnings in tests

Author: AA-Turner

.github/workflows/test.yml

@@ -79,10 +79,10 @@ jobs:
     - name: Test with pytest
       run: python -m pytest -vv
       env:
-        PYTHONWARNINGS: "error"  # treat all warnings as errors
+        PYTHONWARNINGS: "error,ignore::DeprecationWarning:sphinx.builders.gettext"  # treat all warnings as errors
     - name: Install social-cards extra
       run: uv pip install .[social-cards]
     - name: Test with pytest (social-cards)
       run: python -m pytest -vv
       env:
-        PYTHONWARNINGS: "error"  # treat all warnings as errors
+        PYTHONWARNINGS: "error,ignore::EncodingWarning:matplotlib.font_manager,ignore::DeprecationWarning:sphinx.builders.gettext"  # treat all warnings as errors

tests/conftest.py

@@ -6,6 +6,13 @@
 import sphinx
 from bs4 import BeautifulSoup
 
+try:
+    import matplotlib as mpl
+except ImportError:
+    pass
+else:
+    mpl.rcParams['figure.max_open_warning'] = 0
+
 pytest_plugins = ['sphinx.testing.fixtures']
 
 
@@ -27,9 +34,9 @@ def content(app):
 
 def _meta_tags(content, subdir=None):
     if subdir is None:
-        c = (content.outdir / 'index.html').read_text()
+        c = (content.outdir / 'index.html').read_text(encoding='utf-8')
     else:
-        c = (content.outdir / subdir / 'index.html').read_text()
+        c = (content.outdir / subdir / 'index.html').read_text(encoding='utf-8')
     return BeautifulSoup(c, 'html.parser').find_all('meta')