tests: add/update tests/test_launcher_config.py

tests/test_launcher_config.py

@@ -0,0 +1,57 @@
+"""Launcher helpers that don't require launching the actual browser."""
+import pytest
+
+from invisible_playwright.launcher import (
+    InvisiblePlaywright,
+    _IANA_TO_POSIX_TZ,
+    _tz_env,
+    _CHROME_W,
+    _CHROME_H,
+    _TASKBAR_H,
+)
+
+
+def test_tz_env_known_iana_returns_posix():
+    assert _tz_env("America/New_York") == "EST5EDT"
+    assert _tz_env("America/Chicago") == "CST6CDT"
+    assert _tz_env("America/Los_Angeles") == "PST8PDT"
+
+
+def test_tz_env_arizona_no_dst():
+    """America/Phoenix must NOT have a DST suffix — Arizona doesn't observe DST."""
+    assert _tz_env("America/Phoenix") == "MST7"
+
+
+def test_tz_env_hawaii_no_dst():
+    assert _tz_env("Pacific/Honolulu") == "HST10"
+
+
+def test_tz_env_unknown_iana_passes_through():
+    """Linux glibc parses IANA names directly via /usr/share/zoneinfo,
+    so unknown zones should fall through unchanged."""
+    assert _tz_env("Europe/Berlin") == "Europe/Berlin"
+    assert _tz_env("Asia/Tokyo") == "Asia/Tokyo"
+
+
+def test_iana_to_posix_table_well_formed():
+    for iana, posix in _IANA_TO_POSIX_TZ.items():
+        assert "/" in iana, f"{iana} is not an IANA zone identifier"
+        assert "/" not in posix, f"{posix} should be POSIX format, no slashes"
+        assert posix[0].isalpha(), f"{posix} should start with a letter"
+
+
+def test_chrome_offsets_are_positive_ints():
+    """These pad the spoofed viewport to fit inside the spoofed screen.
+    Any zero/negative value would let viewport bleed past screen bounds."""
+    assert _CHROME_W > 0
+    assert _CHROME_H > 0
+    assert _TASKBAR_H > 0
+
+
+def test_invisible_playwright_constructs_without_launching():
+    """The class should be instantiable for inspection without entering
+    the context manager (which would try to download the binary)."""
+    obj = InvisiblePlaywright(seed=42)
+    assert obj is not None
+    obj2 = InvisiblePlaywright(seed=42, headless=True)
+    assert obj2 is not None