Issue #3319044: Give more meaningful error results in CoreUpdateTest::testCron

package_manager/tests/fixtures/FixtureUtilityTraitTest/existing_correct_fixture/vendor/composer/installed.json

+{
+    "packages": [
+        {
+            "name": "the-org/the-package",
+            "version": "9.8.0"
+        }
+    ],
+    "dev-package-names": []
+}
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