debug: improve the assert firing in #1896

nedbat · Nov 21, 2024 · 7f3e6cd · 7f3e6cd
1 parent 3ed5915
commit 7f3e6cd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/coverage/lcovreport.py b/coverage/lcovreport.py
@@ -121,7 +121,9 @@ def lcov_arcs(
             # this probably means 'line' was never executed at all.
             # Cross-check with the line stats.
             assert len(executed_arcs[line]) == 0
-            assert line in analysis.missing
+            assert line in analysis.missing, (
+                f"In {fr.filename}: {line=} should be in analysis.missing={sorted(analysis.missing)}"
+            )
             destinations = [
                 (dst, "-") for dst in missing_arcs[line]
             ]