Fix encoding warnings with PEP 597 enabled

.github/workflows/tests.yml

@@ -5,6 +5,9 @@ on:
   push:
     branches: [main]
 
+env:
+  PYTHONWARNDEFAULTENCODING: 'true'
+
 jobs:
   tests:
     name: ${{ matrix.os }} / ${{ matrix.python-version }}

src/poetry/core/masonry/builders/wheel.py

@@ -385,6 +385,7 @@ def _get_sys_tags(self) -> list[str]:
                 ],
                 stderr=subprocess.STDOUT,
                 text=True,
+                encoding="utf-8",
             )
         except subprocess.CalledProcessError as e:
             raise RuntimeError(

src/poetry/core/vcs/__init__.py

@@ -28,6 +28,7 @@ def get_vcs(directory: Path) -> Git | None:
                 [executable(), "rev-parse", "--show-toplevel"],
                 stderr=subprocess.STDOUT,
                 text=True,
+                encoding="utf-8",
             ).strip()
 
             vcs = Git(Path(git_dir))

tests/masonry/builders/test_builder.py

@@ -307,7 +307,9 @@ def test_metadata_with_readme_files() -> None:
 
     readme1 = test_path / "README-1.rst"
     readme2 = test_path / "README-2.rst"
-    description = "\n".join([readme1.read_text(), readme2.read_text(), ""])
+    description = "\n".join(
+        [readme1.read_text(encoding="utf-8"), readme2.read_text(encoding="utf-8"), ""]
+    )
 
     assert metadata.get_payload() == description
 

tests/pyproject/conftest.py

@@ -12,7 +12,7 @@
 @pytest.fixture
 def pyproject_toml(tmp_path: Path) -> Path:
     path = tmp_path / "pyproject.toml"
-    with path.open(mode="w"):
+    with path.open(mode="w", encoding="utf-8"):
         pass
     return path
 
@@ -24,7 +24,7 @@ def build_system_section(pyproject_toml: Path) -> str:
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
 """
-    with pyproject_toml.open(mode="a") as f:
+    with pyproject_toml.open(mode="a", encoding="utf-8") as f:
         f.write(content)
     return content
 
@@ -38,6 +38,6 @@ def poetry_section(pyproject_toml: Path) -> str:
 [tool.poetry.dependencies]
 python = "^3.5"
 """
-    with pyproject_toml.open(mode="a") as f:
+    with pyproject_toml.open(mode="a", encoding="utf-8") as f:
         f.write(content)
     return content

tests/utils/test_helpers.py

@@ -103,7 +103,7 @@ def test_utils_helpers_combine_unicode() -> None:
 def test_utils_helpers_temporary_directory_readonly_file() -> None:
     with temporary_directory() as temp_dir:
         readonly_filename = os.path.join(temp_dir, "file.txt")
-        with open(readonly_filename, "w+") as readonly_file:
+        with open(readonly_filename, "w+", encoding="utf-8") as readonly_file:
             readonly_file.write("Poetry rocks!")
         os.chmod(str(readonly_filename), S_IREAD)