bpo-43651: PEP 597: Fix EncodingWarning in some tests (GH-25181)

Author: methane

tests/fixtures.py

@@ -257,7 +257,7 @@ def build_files(file_defs, prefix=pathlib.Path()):
                 with full_name.open('wb') as f:
                     f.write(contents)
             else:
-                with full_name.open('w') as f:
+                with full_name.open('w', encoding='utf-8') as f:
                     f.write(DALS(contents))
 
 

tests/test_main.py

@@ -84,7 +84,7 @@ def pkg_with_dashes(site_dir):
         metadata_dir = site_dir / 'my_pkg.dist-info'
         metadata_dir.mkdir()
         metadata = metadata_dir / 'METADATA'
-        with metadata.open('w') as strm:
+        with metadata.open('w', encoding='utf-8') as strm:
             strm.write('Version: 1.0\n')
         return 'my-pkg'
 
@@ -105,7 +105,7 @@ def pkg_with_mixed_case(site_dir):
         metadata_dir = site_dir / 'CherryPy.dist-info'
         metadata_dir.mkdir()
         metadata = metadata_dir / 'METADATA'
-        with metadata.open('w') as strm:
+        with metadata.open('w', encoding='utf-8') as strm:
             strm.write('Version: 1.0\n')
         return 'CherryPy'