Add Hypothesis property tests for blob/bubble parsing (#71)

[bradjin8]

Summary

• Adds tests/test_blob_parsing_fuzz.py with Hypothesis property tests for the blob/bubble parsing pipeline (closes Add fuzz/property-based tests for blob parsing #71).
• Covers Bubble.from_dict (including adversarial non-dict inputs and invalid bubble_id types), workspace-tabs-style KV assembly (json.loads → Bubble.from_dict), CLI blob chain parsing (classify_blob_data, _extract_blob_refs, traverse_blobs on generated store.db fixtures), and text extraction (extract_text_from_bubble, messages_to_bubbles).
• Extracts shared classify_blob_data() in utils/cli_chat_reader.py so traverse_blobs and fuzz tests use the same JSON-vs-chain classification logic.
• Fixes extract_text_from_bubble to always return str when text is a non-string truthy value.
• Adds hypothesis>=6.100,<7 to [project.optional-dependencies].dev in pyproject.toml and installs it in CI alongside pytest.
• Documents pip install -e ".[dev]" in the README and ignores .hypothesis/ in .gitignore.

Test plan

• python -m unittest tests.test_blob_parsing_fuzz -v
• python -m unittest discover tests -v (full suite, including new fuzz tests)
• CI green on the unittest matrix (Linux / Windows / macOS × Python 3.10–3.13)

Notes

• Dev dependencies (hypothesis, pytest, mypy) are not added to requirements.txt / requirements-lock.txt (same pattern as pytest today).
• Eval context: addresses Test 31 / “Unverified Dark Path” coverage for parser invariants without crashing on schema drift inputs.

Summary by CodeRabbit

• Documentation

  • Added development setup instructions to README with pip install guidance for contributors

• Bug Fixes

  • More robust text extraction with consistent string handling
  • Improved blob parsing and traversal for more reliable message/attachment handling

• Tests

  • Added comprehensive property/fuzz tests covering parsing, blob traversal, and text extraction

• Chores

  • CI test workflow now installs property-testing tooling
  • .gitignore updated to exclude local Hypothesis artifacts

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Configuration used: defaults

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Run ID: cdad0fa6-040b-4e74-9d37-16409d9169df

📥 Commits

Reviewing files that changed from the base of the PR and between 24a144b and ca33259.

📒 Files selected for processing (5)

• .github/workflows/tests.yml
• tests/test_blob_parsing_fuzz.py
• tests/test_cli_chat_reader.py
• tests/test_models.py
• utils/cli_chat_reader.py

🚧 Files skipped from review as they are similar to previous changes (1)

• utils/cli_chat_reader.py

---

📝 Walkthrough

Walkthrough

Adds Hypothesis to dev dependencies and CI, ignores Hypothesis artifacts, centralizes blob classification and publicizes extract_blob_refs, coerces bubble text to str, and adds Hypothesis fuzz tests for bubble parsing, blob-chain traversal, and text extraction.

Changes

Property-Based Testing for Blob Parsing

Layer / File(s)	Summary
Hypothesis configuration & docs pyproject.toml, .github/workflows/tests.yml, .gitignore, README.md	Adds hypothesis>=6.100,<7 to dev extras, installs Hypothesis in the unittest CI job, ignores .hypothesis/, and documents pip install -e ".[dev]" for development installs.
Blob classification & text extraction utils/cli_chat_reader.py, utils/text_extract.py	Renames _extract_blob_refs → extract_blob_refs, adds classify_blob_data(data: bytes) and wires it into traverse_blobs to separate JSON message blobs from binary chain nodes; extract_text_from_bubble() now coerces bubble["text"] to str and guarantees a string return.
Hypothesis fuzz test suite tests/test_blob_parsing_fuzz.py, tests/test_cli_chat_reader.py, tests/test_models.py	Adds comprehensive Hypothesis strategies, helpers, and tests that build temporary store.db artifacts and assert Bubble.from_dict, workspace assembly, extract_blob_refs/classify_blob_data/traverse_blobs, and extract_text_from_bubble never raise unexpected exceptions and are idempotent; updates existing tests to import the public extract_blob_refs.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• cppalliance/cppa-cursor-browser#23: Modifies utils/cli_chat_reader.py including traverse_blobs-related logic; code-level related.

Suggested reviewers

• timon0305
• wpak-ai

Poem

🐰 In bytes and blobs I nimbly play,

I chase the edges where errors may stray.
I test each bubble, chain, and line,
Repeat and assert till outputs align.
🥕 A rabbit's hop for safer parsing time!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding Hypothesis property tests for blob/bubble parsing, directly matching the primary objective of the PR.
Linked Issues check	✅ Passed	The PR successfully implements all acceptance criteria from issue #71: hypothesis added to dev dependencies, 4+ property tests covering Bubble.from_dict/blob parsing/text extraction, @given decorators with Hypothesis strategies used throughout, parsing verified to never raise unhandled exceptions (only SchemaError), and tests should complete within time bounds.
Out of Scope Changes check	✅ Passed	All changes are directly aligned with issue #71 objectives: test infrastructure (fuzz tests, Hypothesis dependency), refactoring of shared blob classification logic (classify_blob_data), and bug fixes for robustness (extract_text_from_bubble string coercion). No unrelated changes detected.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/fuzz-property-based-tests

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@tests/test_blob_parsing_fuzz.py`:
- Around line 158-160: In _assemble_workspace_bubble the branch that checks if
not isinstance(bubble_id, str) calls Bubble.from_dict(parsed,
bubble_id=bubble_id) which will raise SchemaError via require_non_empty_str, so
the subsequent return None is dead code; remove the unreachable "return None"
after Bubble.from_dict in _assemble_workspace_bubble so control flow relies on
the existing SchemaError handling and the outer except SchemaError that already
returns None.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

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Run ID: e10ebaad-910d-447a-a14b-601a0a2b0f21

📥 Commits

Reviewing files that changed from the base of the PR and between adb75a4 and a4ab1af.

📒 Files selected for processing (7)

• .github/workflows/tests.yml
• .gitignore
• README.md
• pyproject.toml
• tests/test_blob_parsing_fuzz.py
• utils/cli_chat_reader.py
• utils/text_extract.py

[bradjin8]

@coderabbitai review this PR.

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🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
echo "=== tests/test_blob_parsing_fuzz.py ==="
cat tests/test_blob_parsing_fuzz.py

echo ""
echo "=== utils/cli_chat_reader.py ==="
cat utils/cli_chat_reader.py

echo ""
echo "=== utils/text_extract.py ==="
cat utils/text_extract.py

echo ""
echo "=== pyproject.toml ==="
cat pyproject.toml

echo ""
echo "=== .github/workflows/tests.yml ==="
cat .github/workflows/tests.yml

echo ""
echo "=== README.md ==="
cat README.md

echo ""
echo "=== .gitignore (last 20 lines) ==="
tail -20 .gitignore

echo ""
echo "=== models/conversation.py (Bubble class) ==="
cat models/conversation.py 2>/dev/null || fd -e py -g '*conversation*' --exec cat {}

echo ""
echo "=== services/workspace_tabs.py ==="
cat services/workspace_tabs.py 2>/dev/null || fd -e py -g '*workspace_tabs*' --exec cat {}

echo ""
echo "=== Directory structure ==="
tree -L 3 --gitignore 2>/dev/null || find . -maxdepth 3 -not -path './.git/*' | sort

Length of output: 94416

---

---

@bradjin8 Here is the full review of PR #81.

---

PR Review: Add Hypothesis property tests for blob/bubble parsing (#71)

Overview

This is a well-structured PR. The classify_blob_data() refactor is a clean improvement, the extract_text_from_bubble str-coercion fix is correct, and the test design (no-raise + idempotency + adversarial assertions) follows Hypothesis best practices. A few items worth addressing before merge:

---

tests/test_blob_parsing_fuzz.py

🔴 test_traverse_blobs_never_raises may never reach the BFS code path

The meta fixture passes only two fields:

meta = {"latestRootBlobId": root_id, "createdAt": 1_700_000_000_000}

Inside traverse_blobs, the meta is validated through CliSessionMeta.from_dict(...), which is caught as SchemaError and causes an early return []. If CliSessionMeta requires additional mandatory fields (e.g. agentId, mode, name), the BFS traversal and classify_blob_data logic will never actually be exercised by this test. You'd want to verify against models/cli_session.py and either include all required fields or patch the schema validator:

# Option A – complete the fixture
meta = {
    "latestRootBlobId": root_id,
    "createdAt": 1_700_000_000_000,
    "agentId": "test-agent",
    "mode": "agent",
    "name": "test",
}

# Option B – bypass schema validation so BFS is always reachable
from unittest.mock import patch
with patch("utils.cli_chat_reader.CliSessionMeta.from_dict", return_value=mock_meta):
    messages = traverse_blobs(db_path)

🟡 test_traverse_blobs_never_raises can trigger HealthCheck.too_slow

deadline=None only disables the per-example time budget; it does not suppress HealthCheck.too_slow. With 40 examples × SQLite DB creation per example, slow CI runners (especially Windows) can trip this. Add the suppression explicitly:

`@settings`(
    max_examples=40,
    deadline=None,
    suppress_health_check=[HealthCheck.too_slow],
)

You'll also need to add the import:

from hypothesis import HealthCheck, given, settings

🟡 _assemble_workspace_bubble reimplements rather than wraps production logic

The test helper comments say "Mirror workspace_tabs KV bubble load" but it is an independent reimplementation. If _loads_kv_value_logged or the unsupported-type branch in workspace_tabs.py changes, this test would not catch the regression. Consider either wrapping the actual function under test or adding a comment acknowledging the intentional decoupling:

# NOTE: This intentionally re-implements the KV-to-Bubble conversion rather than
# importing _loads_kv_value_logged, which has side effects (logging, payload hashing).
# Keep in sync with workspace_tabs.assemble_workspace_tabs if the KV load logic changes.

🟡 @st.composite return type annotation

The annotated return type -> dict on a @st.composite strategy is technically incorrect — it returns SearchStrategy[dict], not a bare dict. Type checkers may warn. Fix:

# Before
`@st.composite`
def _cli_message(draw) -> dict:

# After
from hypothesis.strategies import SearchStrategy

`@st.composite`
def _cli_message(draw) -> SearchStrategy[dict]:

Or simply omit the return annotation since Hypothesis's type stubs handle inference.

🟢 Minor: importing private symbol _extract_blob_refs

from utils.cli_chat_reader import (
    ...
    _extract_blob_refs,
)

Testing a private function directly is valid here since classify_blob_data delegates to it, but a brief comment acknowledging this is testing an internal helper (and that renaming it would require updating the import) avoids future confusion.

---

utils/cli_chat_reader.py

🟢 classify_blob_data — clean extraction

The new function correctly handles all three failure modes (UnicodeDecodeError, json.JSONDecodeError, TypeError). The isinstance(data, bytes) guard in traverse_blobs' load loop before calling classify_blob_data keeps the type contract honest.

🟢 _extract_blob_refs boundary condition

while i + 33 < len(data) is equivalent to i + 34 <= len(data), which is the exact minimum needed before accessing data[i+2:i+34]. No off-by-one.

---

utils/text_extract.py

🟢 extract_text_from_bubble fix is correct

if bubble.get("text") and str(bubble["text"]).strip():
    text = str(bubble["text"])

The str() coercion handles schema-drifted payloads where text is an int or bool, and the final guard return text if isinstance(text, str) else "" is now a redundant-but-harmless safety net. Looks good.

---

CI / tooling

🟢 tests.yml hypothesis install is consistent with pyproject.toml

Both use hypothesis>=6.100,<7. The mypy job is unaffected because ignore_missing_imports = true covers the uninstalled package.

🟡 Hypothesis database committed vs. gitignored

.hypothesis/ is correctly gitignored for most projects. Just worth knowing: committing it would speed up CI re-runs by replaying previously-found failures. The current choice (ignore it) is the standard default and is fine.

---

Summary

Severity	Item
🔴	test_traverse_blobs_never_raises: meta fixture may always trigger SchemaError, never reaching BFS
🟡	Missing suppress_health_check=[HealthCheck.too_slow] for SQLite-creating test
🟡	_assemble_workspace_bubble reimplements production logic without a sync note
🟡	@st.composite _cli_message return annotation should be SearchStrategy[dict]
🟢	classify_blob_data refactor — clean, correct
🟢	extract_text_from_bubble str-coercion fix — correct
🟢	Bounded strategies + deadline=None — appropriate for CI