Fix TZ env variable not being respected on MacOS

Author: Secrus

src/pendulum/tz/local_timezone.py

@@ -150,6 +150,9 @@ def _get_windows_timezone() -> Timezone:
 
 
 def _get_darwin_timezone() -> Timezone:
+    if tzenv := os.environ.get("TZ"):
+        with contextlib.suppress(ValueError):
+            return _tz_from_env(tzenv)
     # link will be something like /usr/share/zoneinfo/America/Los_Angeles.
     link = os.readlink("/etc/localtime")
     tzname = link[link.rfind("zoneinfo/") + 9 :]

tests/tz/test_local_timezone.py

@@ -7,6 +7,8 @@
 
 from pendulum.tz.local_timezone import _get_unix_timezone
 from pendulum.tz.local_timezone import _get_windows_timezone
+from pendulum.tz.local_timezone import get_local_timezone
+from pendulum.tz.timezone import Timezone
 
 
 @pytest.mark.skipif(
@@ -50,3 +52,15 @@ def test_unix_etc_timezone_dir():
     tz = _get_unix_timezone(_root=root_path)
 
     assert tz.name == "Europe/Paris"
+
+
+@pytest.mark.skipif(
+    sys.platform == "win32", reason="Test only available for UNIX systems"
+)
+def test_unix_respects_TZ_env_var(monkeypatch):  # noqa: N802
+    monkeypatch.setattr("pendulum.tz.local_timezone._local_timezone", None)
+    monkeypatch.setenv("TZ", "Europe/Paris")
+
+    tz = get_local_timezone()
+
+    assert tz == Timezone("Europe/Paris")