Remove unused coverage rules, mark PYTHONMALLOC no cover, and stop pr…

…inting coverage env vars in tox

pyproject.toml

@@ -28,33 +28,15 @@ exclude_lines = [
 ]
 
 [tool.coverage.coverage_conditional_plugin.rules]
-# Packages/Modules
 no-cover-if-missing-setuptools_scm = "not is_installed('setuptools_scm')"
-# Linux
-no-cover-if-is-linux = "'linux' == os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
 no-cover-if-not-linux = "'linux' != os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
-# macOS
 no-cover-if-is-macos = "'darwin' == os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
 no-cover-if-not-macos = "'darwin' != os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
-# Windows
 no-cover-if-is-windows = "'win32' == os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
 no-cover-if-not-windows = "'win32' != os_environ.get('COVERAGE_PLATFORM', sys_platform) and os_environ.get('COVERAGE_EXCLUDE_PLATFORM') != 'disable'"
-# Python 3.12
-no-cover-if-is-py312 = "python_version == '3.12' and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-lt-py312 = "sys_version_info < (3, 12) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-gte-py312 = "sys_version_info > (3, 12) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-# Python 3.11
-no-cover-if-is-py311 = "python_version == '3.11' and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-lt-py311 = "sys_version_info < (3, 11) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-gte-py311 = "sys_version_info > (3, 11) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-# Python 3.10
-no-cover-if-is-py310 = "python_version == '3.10' and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
 no-cover-if-lt-py310 = "sys_version_info < (3, 10) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
 no-cover-if-gte-py310 = "sys_version_info > (3, 10) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-# Python 3.9
-no-cover-if-is-py39 = "python_version == '3.9' and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-lt-py39 = "sys_version_info < (3, 9) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
-no-cover-if-gte-py39 = "sys_version_info > (3, 9) and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
+
 # Python 3.8
 no-cover-if-is-py38 = "python_version == '3.8' and os_environ.get('COVERAGE_EXCLUDE_PYTHON_VERSION') != 'disable'"
 

src/briefcase/commands/dev.py

@@ -147,7 +147,8 @@ def get_environment(self, app, test_mode: bool):
         # On Windows, we need to disable the debug allocator because it
         # conflicts with Python.net. See
         # https://github.com/pythonnet/pythonnet/issues/1977 for details.
-        if self.platform == "windows":
+        # marking no cover since a single platform cannot take both branches
+        if self.platform == "windows":  # pragma: no cover
             env["PYTHONMALLOC"] = "default"
 
         return env

tests/commands/dev/test_get_environment.py

@@ -1,29 +1,12 @@
 import sys
 from pathlib import Path
-from unittest.mock import PropertyMock
 
 import pytest
 
 PYTHONPATH = "PYTHONPATH"
 PYTHONMALLOC = "PYTHONMALLOC"
 
 
-@pytest.mark.parametrize("platform", ["windows", "darwin", "linux", "wonky"])
-def test_pythonmalloc_only_set_for_windows(
-    dev_command,
-    first_app,
-    platform,
-    monkeypatch,
-):
-    """PYTHONMALLOC env var is only set on Windows."""
-    monkeypatch.setattr(
-        type(dev_command), "platform", PropertyMock(return_value=platform)
-    )
-    env = dev_command.get_environment(first_app, test_mode=False)
-    expected = "default" if platform == "windows" else "missing"
-    assert env.get(PYTHONMALLOC, "missing") == expected
-
-
 @pytest.mark.skipif(sys.platform != "win32", reason="Relevant only for windows")
 def test_pythonpath_with_one_source_in_windows(dev_command, first_app):
     """Test get environment with one source."""

tox.ini

@@ -58,14 +58,7 @@ setenv =
     {platform,project}: COVERAGE_EXCLUDE_PYTHON_VERSION=disable
     # disable coverage exclusions for host platform to test entire project
     project: COVERAGE_EXCLUDE_PLATFORM=disable
-commands_pre =
-    python --version
-    python -c 'if 1: \
-        import os; \
-        print("COVERAGE_FILE", os.environ.get("COVERAGE_FILE", "<not set>")); \
-        print("COVERAGE_PLATFORM", os.environ.get("COVERAGE_PLATFORM", "<not set>")); \
-        print("COVERAGE_EXCLUDE_PYTHON_VERSION", os.environ.get("COVERAGE_EXCLUDE_PYTHON_VERSION", "<not set>")); \
-        print("COVERAGE_EXCLUDE_PLATFORM", os.environ.get("COVERAGE_EXCLUDE_PLATFORM", "<not set>"))'
+commands_pre = python --version
 commands =
     -python -m coverage combine {env:COMBINE_FLAGS}
     html: python -m coverage html --skip-covered --skip-empty