[pytest] Tell it where tests are

Also tell coverage how to behave

pyproject.toml

@@ -13,3 +13,16 @@ build-backend = "hatchling.build"
 
 [tool.pytest.ini_options]
 pythonpath = ["src"]
+testpaths = ["tests"]
+
+[tool.coverage.run]
+branch = true
+data_file = "coverage/.coverage"
+source = ["src"]
+omit = ["*/migrations/*"]
+
+[tool.coverage.html]
+directory = "coverage/htmlcov"
+
+[tool.coverage.report]
+skip_empty = true