Normalize pytest-cov contexts and parallelize map build

cvanelteren · cvanelteren · commit ba56e9a676b2 · 2026-02-01T21:37:58.000+10:00
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -64,7 +64,7 @@ jobs:
           echo "Test map cache miss; generating map from tests."
           pip install --no-build-isolation --no-deps .
           mkdir -p .ci
-          pytest -q --tb=short --disable-warnings -n 0 -p pytest_cov \
+          pytest -q --tb=short --disable-warnings -n auto -p pytest_cov \
             --cov=ultraplot --cov-branch --cov-context=test --cov-report= \
             ultraplot/tests
           python tools/ci/build_test_map.py --coverage-file .coverage --output .ci/test-map.json --root .
diff --git a/tools/ci/build_test_map.py b/tools/ci/build_test_map.py
@@ -34,8 +34,14 @@ def build_map(coverage_file: str, repo_root: str) -> dict[str, list[str]]:
 
         contexts = set()
         for ctxs in contexts_by_line.values():
-            if ctxs:
-                contexts.update(ctxs)
+            if not ctxs:
+                continue
+            for ctx in ctxs:
+                if not ctx:
+                    continue
+                # Pytest-cov can append "|run"/"|setup"/"|teardown" to nodeids.
+                # Strip phase suffixes so selection uses valid nodeids.
+                contexts.add(ctx.split("|", 1)[0])
         if contexts:
             files_map[rel] = contexts
 
