mock os.pathsep when running macOS tests on non-macOS systems

Author: singingwolfboy

tests/test_macos.py

@@ -13,6 +13,17 @@
     from pytest_mock import MockerFixture
 
 
+@pytest.fixture(autouse=True)
+def _fix_os_pathsep(mocker: MockerFixture) -> None:
+    """
+    If we're not actually running on macOS, set `os.pathsep` to
+    what it should be on macOS.
+    """
+    if sys.platform != "darwin":
+        mocker.patch("os.pathsep", ":")
+        mocker.patch("os.path.pathsep", ":")
+
+
 @pytest.mark.parametrize(
     "params",
     [