Invalidate warmed wasm modules precisely

scripts/test_dependency_invalidation.sh

@@ -32,17 +32,34 @@ printf '%s\n' \
 	'CLI(Request& context) { print(dependency_cache_marker()); }' \
 	'RENDER(Request& context) { print(dependency_cache_marker()); }' >"$source_dir/parent.uce"
 
-first=$(scripts/uce-cli "/$test_name/parent.uce")
-if [[ "$first" != *dependency-marker-a* ]]; then
-	echo "dependency invalidation setup failed: $first" >&2
-	exit 1
-fi
+assert_marker() {
+	local path="$1"
+	local expected="$2"
+	local output
+	output=$(scripts/uce-cli "/$test_name/$path.uce")
+	if [[ "$output" != *"$expected"* ]]; then
+		echo "$path returned stale module; expected $expected: $output" >&2
+		exit 1
+	fi
+}
+
+assert_marker parent dependency-marker-a
 
 sed -i 's/dependency-marker-a/dependency-marker-b/' "$source_dir/child.uce"
-second=$(scripts/uce-cli "/$test_name/parent.uce")
-if [[ "$second" != *dependency-marker-b* ]]; then
-	echo "loaded dependency change did not recompile parent: $second" >&2
-	exit 1
-fi
+assert_marker parent dependency-marker-b
+
+# Warm every configured worker, then replace the artifact while retaining its
+# whole-second mtime. The worker cache must notice the nanosecond/ctime change.
+for _ in {1..16}; do assert_marker parent dependency-marker-b; done
+sed 's/dependency-marker-b/dependency-marker-c/' "$source_dir/child.uce" >"$source_dir/alternate-child.uce"
+sed 's/child.uce/alternate-child.uce/' "$source_dir/parent.uce" >"$source_dir/alternate.uce"
+assert_marker alternate dependency-marker-c
+parent_wasm="$cache_dir/parent.uce.wasm"
+alternate_wasm="$cache_dir/alternate.uce.wasm"
+parent_mtime=$(stat -c %Y "$parent_wasm")
+cp "$alternate_wasm" "$parent_wasm"
+touch -d "@$parent_mtime" "$parent_wasm"
+rm -f "$cache_dir/parent.uce.cwasm"
+for _ in {1..16}; do assert_marker parent dependency-marker-c; done
 
 echo "dependency invalidation passed"