Integrate pytest coverage configuration

pyproject.toml

@@ -0,0 +1,20 @@
+[tool.pytest.ini_options]
+addopts = "-q --cov=addon --cov-report=term-missing"
+python_files = ["test_*.py"]
+norecursedirs = ["scripts"]
+markers = [
+  "live: real HTTP requests (set LIVE_TESTS=1 to run)",
+  "perf: performance benchmarks",
+]
+
+[tool.coverage.run]
+source = ["addon"]
+branch = true
+omit = [
+  "*/__pycache__/*",
+  "addon/resources/*",
+]
+
+[tool.coverage.report]
+show_missing = true
+skip_empty = true