add slow marker

pyproject.toml

@@ -52,4 +52,7 @@ target-version = "py311"
 [tool.pytest.ini_options]
 python_functions = "setup_* test_* cleanup_*"
 norecursedirs = ".* previous-work recipes"
-testpaths = "tests"
+testpaths = "tests"
+markers = [
+    "slow: marks tests as slow",
+]

tests/test_html_merge.py

@@ -1,7 +1,6 @@
 # tmp_path fixture:
 # https://docs.pytest.org/en/6.2.x/tmpdir.html
 
-import os
 from pathlib import Path
 
 import pytest
@@ -34,6 +33,7 @@ def test_merge_html(session_tmp_path: Path):
     assert next(out_assets_dir.glob("*"))
 
 
+@pytest.mark.slow
 def test_check_result_with_playwright(session_tmp_path, context: BrowserContext):
     html_file = session_tmp_path / "test.html"
     file_url = BaseUrl(netloc=html_file.as_posix(), scheme="file").get()