docs(tests): correct the e2e expected-failure helper guidance - #2252
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tests/AGENTS.md told tests expecting a tool failure to use safe_call_tool() directly. The harness disagrees: MCPAssertions .call_tool_failure() is used at 61 call sites across 13 e2e files and does strictly more -- it catches the ToolError, asserts the call actually failed rather than silently succeeding, and matches expected_error against the extracted message. safe_call_tool() swallows ToolError and returns a parsed dict, so using it for an expected failure leaves nothing verifying the call failed. Its real roles are finally-block cleanup and availability probing, which the entry now says. CodeRabbit cites the old line as a coding-guidelines violation whenever call_tool_failure appears, most recently on homeassistant-ai#2246. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015c4gkE9mcKu4RiuQzR5eff
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@codex review — apply the review criteria in .gemini/styleguide.md in addition to AGENTS.md guidance |
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Included review availability: Your plan provides up to 8 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe E2E assertion utilities now share success detection for explicit and implicit success responses. Failure assertions reject success-like results, including converted ChangesE2E tool failure assertions
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This change clarifies expected-failure test guidance and does not alter production behavior or external interfaces. No actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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…docstring
Two corrections from Codex review:
call_tool_failure() only proves the call failed when expected_error is
given. assert_mcp_failure()'s check is `if data.get("success")`, so a
result dict that omits the key entirely is accepted as a failure. The
guidance now says to pass expected_error and states the limitation
rather than claiming the helper always proves failure.
safe_call_tool()'s own docstring still advertised it as the helper for
tests that expect a failure, contradicting the new rule in a second
place and recreating the ambiguity this branch removes. It now names its
real roles -- finally-block cleanup and availability probing -- and
points at call_tool_failure() for asserted failures.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015c4gkE9mcKu4RiuQzR5eff
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Inline comments:
In `@tests/AGENTS.md`:
- Around line 52-56: Update the e2e test using call_tool_failure() in
test_python_transform.py to pass expected_error="config_hash" and remove its
redundant manual config_hash assertion, keeping failure validation within
MCPAssertions.
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tests/AGENTS.mdtests/src/e2e/utilities/assertions.py
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The previous wording made expected_error mandatory. 30 of the 61 call_tool_failure() sites omit it and assert on the returned dict themselves, so that rule would have been broken by half the suite on the day it landed -- the same doc-contradicts-code problem this branch exists to fix. Now stated as a preference, with manual post-assertion named as the equally valid alternative, and the actual failure mode (omitting both) called out. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015c4gkE9mcKu4RiuQzR5eff
assert_mcp_failure guarded on `if data.get("success")`, so a result dict
that succeeds WITHOUT that key -- ha_manage_app's pending_restart write,
bulk-operation payloads carrying total_operations/results -- was
accepted as a failure. An expected-failure test whose tool regressed to
one of those shapes passed silently, and 30 of the 61 call_tool_failure
sites omit expected_error, so nothing else caught it either.
The success-indicator list assert_mcp_success already maintained is now
a shared `looks_like_success()` predicate used by both sides, so the two
cannot disagree about what success means. call_tool_failure's own
ToolError branch uses it too.
Documented in tests/AGENTS.md alongside it: the helper now proves
failure on its own, and expected_error pins which failure.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015c4gkE9mcKu4RiuQzR5eff
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Inline comments:
In `@tests/AGENTS.md`:
- Around line 53-58: Revise the guidance around call_tool_failure() to state
that it already asserts the call failed; expected_error additionally checks an
error-message substring, while a manual result-dictionary assertion checks other
failure details. Clarify that omitting both leaves the error reason and returned
data unchecked, rather than leaving the failure itself unverified.
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tests/AGENTS.md
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The helper fix in fa09814 had no regression test, and this is the class of harness bug that degrades into a green run rather than a red one -- exactly why test_e2e_assertions.py exists. Covers the shapes that used to slip through as failures (pending_restart, bulk payloads keyed on total_operations/results, data-without-error), the genuine failures that must still pass, expected_error matching on a real failure, and pending_restart carrying an explicit error (which the success predicate guards on error is None, so it stays a failure). Four of the five success-shape cases fail against the pre-fix guard: data.get("success") on a dict lacking the key is None, so nothing raised. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015c4gkE9mcKu4RiuQzR5eff
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What does this PR do?
tests/AGENTS.mdand the e2e harness contradict each other on how a test should assert a tool failure, and the doc side is what CodeRabbit enforces.The doc said:
The harness says otherwise.
MCPAssertions.call_tool_failure()(tests/src/e2e/utilities/assertions.py:369) is used at 61 call sites across 13 e2e files, and does strictly more thansafe_call_tool: it catches theToolError, asserts the call actually failed rather than silently succeeding, and — whenexpected_erroris given — matches it against the extracted error message.safe_call_tool()swallowsToolErrorand returns a parsed dict. Used for an expected failure, nothing verifies the call failed at all: a regression that made the call succeed would pass. Its real roles arefinally-block cleanup, so a cleanup failure cannot mask the real assertion, and availability probing.This updates the entry to describe both helpers and when each applies, matching what the suite already does.
CodeRabbit flags the old line as a coding-guidelines violation whenever
call_tool_failureappears — most recently on #2246.Type of change
Testing
uv run pytest) — no code touched; markdown onlyuv run ruff check) — no Python in the diffChecklist
Summary by CodeRabbit
Documentation
Tests