LCORE-4069: compare JSON-in-string assertions by content, not by key order - #2647
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WalkthroughThe partial JSON validator now compares serialized objects and arrays by parsed content. Object key order is ignored, array order remains significant, and JSON value types are compared strictly. ChangesJSON validation behavior
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🟡 Moderate · up to JSON validation may perform excessive repeated parsing when matching unordered list candidates, which can make non-trivial E2E assertions slow. Resolve or explicitly accept this performance risk before merge. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error)
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Full details: Performance And Algorithmic ComplexityExplanation Meaningful regression: Resolution Fix category: avoid repeated parsing inside list matching. Pre-parse or memoize candidate and expected string values before the candidate loop, and skip
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Inline comments:
In `@tests/e2e/utils/utils.py`:
- Around line 340-341: Update validate_json_partially’s list-matching scan to
cache _parsed_json_container results for each input string during a single
invocation, including invalid and scalar outcomes, so repeated candidate
comparisons reuse parsed values. Keep the cache invocation-local and bounded to
the inputs encountered; do not introduce an unbounded shared cache.
- Line 343: Update the comparison in validate_json_partially to compare JSON
values recursively with type identity, preventing booleans from matching
integers while preserving exact key/value matching for nested objects and
arrays. Add a regression test covering true versus 1 and false versus 0.
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tests/e2e/utils/utils.pytests/unit/test_e2e_utils.py
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- GitHub Check: E2E: library / ci / shields
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Flag meaningful O(n^2)+ algorithms on non-trivial inputs, including handlers and Kubernetes list operations.
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Files:
tests/e2e/utils/utils.pytests/unit/test_e2e_utils.py
radofuchs
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LGTM, please just get rid of the tests
| @@ -0,0 +1,86 @@ | |||
| """Unit tests for the shared end-to-end test helpers in ``tests/e2e/utils``.""" | |||
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please remove this file, we do not need to test test-related content
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Removed, thanks.
…order The E2E Tests workflow has failed on every merge to main since 2026-09-03 (first red run: the merge of lightspeed-core#2601). Both the library and server "skills" shards fail on the same two scenarios: tests/e2e/features/skills.feature:694 Skills directory path discovers all skills in subdirectories via query tests/e2e/features/skills.feature:724 ... via streaming_query The assertion compares the tool_results content field: expected: {"echo":"Echo back ...","summarize":"Summarize text ..."} actual: {"summarize":"Summarize text ...","echo":"Echo back ..."} Same two pairs; only the key order differs. The order is filesystem order, not a stable contract. pydantic_ai_skills discovers skills with root_dir.glob('**/SKILL.md'), which is not sorted, and its list_skills tool builds the result from that dict, so the serialized key order follows the scan. validate_json_partially() then compared the two serialized objects as raw strings, byte for byte. The assertion has always depended on filesystem order; it started failing once the runners produced the other order. validate_json_partially() now compares by parsed content when both the expected and the actual value are strings holding a JSON object or array. The comparison stays exact: - Same keys and same values. Relaxing it to the partial semantics the function uses elsewhere would silently weaken every existing assertion over an embedded JSON document, and the scenario is named "discovers all skills". - Same JSON types. Plain == accepts true for 1, false for 0 and 1 for 1.0, which the raw string comparison rejected, so values are compared together with their types. - Array element order still matters; only object key order is ignored. - Bare scalar strings are not parsed and keep the verbatim comparison. The new branch runs only when the two values already differ, so it cannot break an assertion that passes today. Reordering the expected literal in the feature file would not be a fix: it only moves the flake to the next filesystem layout.
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Description
mainhas failed the E2E Tests workflow on every merge since 2026-09-03 (first red run: the merge of #2601). Bothlibrary / ci / skillsandserver / ci / skillsfail on the same two scenarios:The assertion:
Same two pairs. Only the key order differs.
Root cause
list_skillsreturns a mapping whose key order is the filesystem scan order:pydantic_ai_skills/directory.pyfinds skills withroot_dir.glob('**/SKILL.md'), which is not sorted.pydantic_ai_skills/toolset.pybuilds the tool result from that dict, so the JSON key order follows the scan.validate_json_partially()compared the two serialized objects as raw strings, byte for byte.So the assertion has always depended on filesystem order. That also explains why only one shard failed on 2026-09-03 and both fail now: different runners, different directory layouts.
The fix
When both sides are strings holding a JSON object or array,
validate_json_partially()now compares the parsed values instead of the raw text.The comparison stays exact: same keys, same values, same JSON types (
truenever matches1,1never matches1.0), and array order still matters. Only object key order is ignored.Reordering the expected string in the feature file would not fix this. It would only move the flake to the next filesystem layout.
Not in scope
The unsorted order also changes the model's prompt prefix between deployments, which works against prompt caching. That order comes from
pydantic_ai_skills, not from LCS.Type of change
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Testing
Check the failure on
main: theskillsshards of any recent merge run fail onskills.feature:694and:724with the key-order mismatch above.Check the
skillsshards on this PR. Expected: both green. On the first push of this PR,server / ci / skillsreported 9 scenarios passed, 0 failed, including both scenarios above.Summary by CodeRabbit
Bug Fixes
Documentation