add test coverage

.gitignore

@@ -1,3 +1,4 @@
+.coverage
 .env
 .venv
 .mypy_cache

pyproject.toml

@@ -17,6 +17,7 @@ dev = [
     "mypy>=1.16.1",
     "pre-commit>=4.2.0",
     "pytest>=8.4.1",
+    "pytest-cov>=6.2.1",
     "ruff>=0.12.0",
 ]
 
@@ -32,3 +33,6 @@ url = "https://download.pytorch.org/whl/cu126"
 
 [tool.ruff]
 line-length = 120
+
+[tool.pytest.ini_options]
+addopts = "--cov src"

uv.lock

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+]
+
+[package.optional-dependencies]
+toml = [
+    { name = "tomli", marker = "python_full_version <= '3.11'" },
+]
+
 [[package]]
 name = "cupy-cuda12x"
 version = "13.4.1"
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 ]
 
+[[package]]
+name = "pytest-cov"
+version = "6.2.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "coverage", extra = ["toml"] },
+    { name = "pluggy" },
+    { name = "pytest" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/18/99/668cade231f434aaa59bbfbf49469068d2ddd945000621d3d165d2e7dd7b/pytest_cov-6.2.1.tar.gz", hash = "sha256:25cc6cc0a5358204b8108ecedc51a9b57b34cc6b8c967cc2c01a4e00d8a67da2", size = 69432, upload-time = "2025-06-12T10:47:47.684Z" }
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+]
+
 [[package]]
 name = "python-dateutil"
 version = "2.9.0.post0"
@@ -1458,6 +1498,7 @@ dev = [
     { name = "mypy" },
     { name = "pre-commit" },
     { name = "pytest" },
+    { name = "pytest-cov" },
     { name = "ruff" },
 ]
 
@@ -1475,6 +1516,7 @@ dev = [
     { name = "mypy", specifier = ">=1.16.1" },
     { name = "pre-commit", specifier = ">=4.2.0" },
     { name = "pytest", specifier = ">=8.4.1" },
+    { name = "pytest-cov", specifier = ">=6.2.1" },
     { name = "ruff", specifier = ">=0.12.0" },
 ]
 
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 [[package]]
 name = "torch"
 version = "2.7.1+cu126"