Set up pytest and coverage tooling

.gitignore

@@ -2,3 +2,5 @@
 __pycache__
 *.egg-info
 *.pyc
+.coverage
+htmlcov/

pyproject.toml

@@ -17,7 +17,9 @@ dependencies = [
 dev = [
     "beartype",
     "black",
+    "coverage",
     "mypy",
+    "pytest",
     "types-PyYAML",
     "types-Pygments",
 ]
@@ -31,6 +33,15 @@ target-version = ["py314"]
 [tool.mypy]
 strict = true
 
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[tool.coverage.run]
+source = ["omicron"]
+
+[tool.coverage.report]
+show_missing = true
+
 [tool.setuptools.packages.find]
 where = ["."]
 include = ["omicron.ssg*"]

tests/unit/test_site.py

@@ -0,0 +1,19 @@
+from pathlib import Path
+import pytest
+from omicron.ssg.site import Site
+
+
+@pytest.mark.parametrize(
+    "value, expected_origin, expected_path",
+    [
+        (None, "", Path("/")),
+        ("http://example.com/blog", "http://example.com", Path("/blog")),
+        ("http://example.com", "http://example.com", Path("/")),
+        ("//example.com/blog", "//example.com", Path("/blog")),
+        ("/blog", "", Path("/blog")),
+    ],
+)
+def test_parse_base_url(value, expected_origin, expected_path):
+    origin, path = Site.parse_base_url(value)
+    assert origin == expected_origin
+    assert path == expected_path