Add pytest-cov to dev deps and run coverage in CI

Test job now reports coverage (term + xml) and uploads it as a build
artifact, so coverage regressions are visible per-PR.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -82,7 +82,11 @@ jobs:
           echo "UV_CACHE_DIR=/uv-cache" >> "$GITHUB_ENV"
           echo "UV_LINK_MODE=copy" >> "$GITHUB_ENV"
       - run: uv sync --extra cpu --extra dev
-      - run: uv run pytest
+      - run: uv run pytest --cov --cov-report=term-missing --cov-report=xml
+      - uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage.xml
 
   sync-version-on-tag:
     name: Sync project version with tag

.gitignore

@@ -20,3 +20,8 @@ checkpoints/
 
 # giant analyze run directories (shared.json, reduced/, plots/, condor logs)
 /analysis_runs/
+
+# Coverage artifacts
+.coverage
+coverage.xml
+htmlcov/

pyproject.toml

@@ -23,6 +23,7 @@ cuda = [
 ]
 dev = [
     "pytest>=8,<10",
+    "pytest-cov>=5,<8",
     "ruff>=0.15,<1",
     "ty>=0.0.50,<0.1",
     "giant[convert,analysis,geometry,wandb]",
@@ -51,6 +52,16 @@ analysis = [
 giant = "giant.cli:app"
 dwarf = "scripts.dwarf:app"
 
+[tool.coverage.run]
+source = ["giant", "scripts"]
+omit = ["*/legacy/*"]
+
+[tool.coverage.report]
+exclude_also = [
+    "if TYPE_CHECKING:",
+    "raise NotImplementedError",
+]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"

uv.lock

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 ]
 
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+name = "coverage"
+version = "7.15.4"
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+
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 name = "cramjam"
 version = "2.11.0"
@@ -572,6 +671,7 @@ dev = [
     { name = "plotstyle" },
     { name = "polars" },
     { name = "pytest" },
+    { name = "pytest-cov" },
     { name = "ruff" },
     { name = "scikit-learn" },
     { name = "ty" },
@@ -599,6 +699,7 @@ requires-dist = [
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     { name = "pyarrow", specifier = ">=16,<25" },
     { name = "pytest", marker = "extra == 'dev'", specifier = ">=8,<10" },
+    { name = "pytest-cov", marker = "extra == 'dev'", specifier = ">=5,<8" },
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 ]
 
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+version = "7.1.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
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+    { name = "pluggy" },
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+
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 name = "python-dateutil"
 version = "2.9.0.post0"