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109 lines
4.9 KiB
Python
109 lines
4.9 KiB
Python
"""Tests for None guard on browser_tool LLM response content.
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browser_tool.py has two call sites that access response.choices[0].message.content
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without checking for None — _extract_relevant_content (line 996) and
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browser_vision (line 1626). When reasoning-only models (DeepSeek-R1, QwQ)
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return content=None, these produce null snapshots or null analysis.
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These tests verify both sites are guarded.
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"""
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import types
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from unittest.mock import patch
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# ── helpers ────────────────────────────────────────────────────────────────
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def _make_response(content):
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"""Build a minimal OpenAI-compatible ChatCompletion response stub."""
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message = types.SimpleNamespace(content=content)
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choice = types.SimpleNamespace(message=message)
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return types.SimpleNamespace(choices=[choice])
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# ── _extract_relevant_content (line 996) ──────────────────────────────────
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class TestExtractRelevantContentNoneGuard:
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"""tools/browser_tool.py — _extract_relevant_content()"""
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def test_none_content_falls_back_to_truncated(self):
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"""When LLM returns None content, should fall back to truncated snapshot."""
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with patch("tools.browser_tool.call_llm", return_value=_make_response(None)), \
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patch("tools.browser_tool._get_extraction_model", return_value="test-model"):
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from tools.browser_tool import _extract_relevant_content
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result = _extract_relevant_content("This is a long snapshot text", "find the button")
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assert result is not None
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assert isinstance(result, str)
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assert len(result) > 0
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def test_normal_content_returned(self):
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"""Normal string content should pass through."""
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with patch("tools.browser_tool.call_llm", return_value=_make_response("Extracted content here")), \
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patch("tools.browser_tool._get_extraction_model", return_value="test-model"):
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from tools.browser_tool import _extract_relevant_content
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result = _extract_relevant_content("snapshot text", "task")
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assert result == "Extracted content here"
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def test_empty_string_content_falls_back(self):
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"""Empty string content should also fall back to truncated."""
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with patch("tools.browser_tool.call_llm", return_value=_make_response(" ")), \
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patch("tools.browser_tool._get_extraction_model", return_value="test-model"):
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from tools.browser_tool import _extract_relevant_content
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result = _extract_relevant_content("This is a long snapshot text", "task")
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assert result is not None
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assert len(result) > 0
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# ── browser_vision (line 1626) ────────────────────────────────────────────
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class TestBrowserVisionNoneGuard:
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"""tools/browser_tool.py — browser_vision() analysis extraction"""
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def test_none_content_produces_fallback_message(self):
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"""When LLM returns None content, analysis should have a fallback message."""
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response = _make_response(None)
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analysis = (response.choices[0].message.content or "").strip()
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fallback = analysis or "Vision analysis returned no content."
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assert fallback == "Vision analysis returned no content."
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def test_normal_content_passes_through(self):
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"""Normal analysis content should pass through unchanged."""
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response = _make_response(" The page shows a login form. ")
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analysis = (response.choices[0].message.content or "").strip()
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fallback = analysis or "Vision analysis returned no content."
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assert fallback == "The page shows a login form."
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# ── source line verification ──────────────────────────────────────────────
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class TestBrowserSourceLinesAreGuarded:
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"""Verify the actual source file has the fix applied."""
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@staticmethod
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def _read_file() -> str:
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import os
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base = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
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with open(os.path.join(base, "tools", "browser_tool.py")) as f:
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return f.read()
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def test_extract_relevant_content_guarded(self):
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src = self._read_file()
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# The old unguarded pattern should NOT exist
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assert "return response.choices[0].message.content\n" not in src, (
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"browser_tool.py _extract_relevant_content still has unguarded "
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".content return — apply None guard"
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)
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def test_browser_vision_guarded(self):
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src = self._read_file()
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assert "analysis = response.choices[0].message.content\n" not in src, (
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"browser_tool.py browser_vision still has unguarded "
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".content assignment — apply None guard"
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)
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