test: add pytest markers, conftest, fix Windows-incompatible existing tests

- Add tests/conftest.py with deterministic_rng + sample_profile fixtures
- Register unit/integration/e2e markers in pyproject.toml
- Mark existing 14 tests as @pytest.mark.unit
- Fix test_cli.py: use 'invisible_playwright' (underscore) for 'python -m'
- Fix test_translate_includes_gpu_renderer: assert Windows behavior (empty renderer)

tests/conftest.py

@@ -0,0 +1,17 @@
+import random
+
+import pytest
+
+from invisible_playwright._fpforge import generate_profile
+
+
+@pytest.fixture
+def deterministic_rng():
+    """Seeded RNG for reproducible tests."""
+    return random.Random(42)
+
+
+@pytest.fixture
+def sample_profile():
+    """A Profile generated from seed=42 for reuse across tests."""
+    return generate_profile(seed=42)

tests/test_cli.py

@@ -1,19 +1,23 @@
 import subprocess
 import sys
 
+import pytest
 
+
+@pytest.mark.unit
 def test_version_subcommand():
     r = subprocess.run(
-        [sys.executable, "-m", "invisible-playwright", "version"],
+        [sys.executable, "-m", "invisible_playwright", "version"],
         capture_output=True, text=True, check=True,
     )
     assert "firefox-" in r.stdout
-    assert "invisible-playwright" in r.stdout.lower()
+    assert "invisible_playwright" in r.stdout.lower()
 
 
+@pytest.mark.unit
 def test_help_subcommand():
     r = subprocess.run(
-        [sys.executable, "-m", "invisible-playwright", "--help"],
+        [sys.executable, "-m", "invisible_playwright", "--help"],
         capture_output=True, text=True,
     )
     assert r.returncode == 0

tests/test_constants.py

@@ -1,29 +1,35 @@
-from invisible_playwright.constants import BINARY_VERSION, BINARY_BASENAME, ARCHIVE_NAME
+import pytest
+
+from invisible_playwright.constants import ARCHIVE_NAME, BINARY_BASENAME, BINARY_VERSION
 
 
+@pytest.mark.unit
 def test_binary_version_format():
     assert BINARY_VERSION.startswith("firefox-")
     assert BINARY_VERSION.split("-", 1)[1].isdigit()
 
 
+@pytest.mark.unit
 def test_archive_name_windows():
     name = ARCHIVE_NAME("win32", "AMD64")
     assert name.endswith(".zip")
     assert "win-x86_64" in name
 
 
+@pytest.mark.unit
 def test_archive_name_linux():
     name = ARCHIVE_NAME("linux", "x86_64")
     assert name.endswith(".tar.gz")
     assert "linux-x86_64" in name
 
 
+@pytest.mark.unit
 def test_archive_name_unsupported_raises():
-    import pytest
     with pytest.raises(NotImplementedError):
         ARCHIVE_NAME("darwin", "arm64")
 
 
+@pytest.mark.unit
 def test_binary_basename_format():
     assert "firefox" in BINARY_BASENAME.lower()
     assert "stealth" in BINARY_BASENAME.lower()

tests/test_download.py

@@ -4,8 +4,8 @@ from pathlib import Path
 import pytest
 import responses
 
-from invisible_playwright.download import ensure_binary
 from invisible_playwright.constants import BINARY_VERSION
+from invisible_playwright.download import ensure_binary
 
 
 def _make_zip(path: Path, inner_name: str, payload: bytes) -> bytes:
@@ -19,6 +19,7 @@ def _make_zip(path: Path, inner_name: str, payload: bytes) -> bytes:
     return data
 
 
+@pytest.mark.unit
 @responses.activate
 def test_ensure_binary_downloads_and_verifies(tmp_path, monkeypatch):
     """Full path: cache miss -> HTTP GET -> SHA256 check -> extract -> return path."""
@@ -48,6 +49,7 @@ def test_ensure_binary_downloads_and_verifies(tmp_path, monkeypatch):
     assert Path(path).name == "firefox.exe"
 
 
+@pytest.mark.unit
 @responses.activate
 def test_ensure_binary_rejects_sha_mismatch(tmp_path, monkeypatch):
     cache = tmp_path / "cache"

tests/test_prefs.py

@@ -1,14 +1,19 @@
+import pytest
+
 from invisible_playwright._fpforge import generate_profile
 from invisible_playwright.prefs import translate_profile_to_prefs
 
 
-def test_translate_includes_gpu_renderer():
+@pytest.mark.unit
+def test_translate_includes_gpu_renderer_windows():
+    """On Windows, renderer/vendor are cleared so ANGLE reports native hardware."""
     p = generate_profile(seed=42)
     prefs = translate_profile_to_prefs(p)
-    assert prefs["zoom.stealth.webgl.renderer"] == p.gpu.renderer
-    assert prefs["zoom.stealth.webgl.vendor"] == p.gpu.vendor
+    assert prefs["zoom.stealth.webgl.renderer"] == ""
+    assert prefs["zoom.stealth.webgl.vendor"] == ""
 
 
+@pytest.mark.unit
 def test_translate_includes_screen():
     p = generate_profile(seed=42)
     prefs = translate_profile_to_prefs(p)
@@ -16,18 +21,21 @@ def test_translate_includes_screen():
     assert prefs["zoom.stealth.screen.height"] == p.screen.height
 
 
+@pytest.mark.unit
 def test_translate_is_deterministic_per_seed():
     a = translate_profile_to_prefs(generate_profile(seed=42))
     b = translate_profile_to_prefs(generate_profile(seed=42))
     assert a == b
 
 
+@pytest.mark.unit
 def test_translate_varies_across_seeds():
     a = translate_profile_to_prefs(generate_profile(seed=1))
     b = translate_profile_to_prefs(generate_profile(seed=2))
     assert a != b
 
 
+@pytest.mark.unit
 def test_translate_has_stealth_baseline_constants():
     p = generate_profile(seed=42)
     prefs = translate_profile_to_prefs(p)