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hermes-agent/tests/tools/test_browser_homebrew_paths.py
Teknium 42be5e49b0
fix(browser): detect missing Chromium and fail fast with actionable error (#17039) 
Previously, check_browser_requirements() only checked for the agent-browser
CLI, not the Chromium binary it drives. When the CLI was present but
Chromium wasn't (common in Docker images predating the playwright install
step), the browser tool was advertised to the agent, every call hung for
the full command timeout (~30s each, ~220s for a chained navigate), and
the agent eventually gave up with no useful error — users saw 'browser
not working' with empty errors.log.

Changes:
- tools/browser_tool.py: add _chromium_installed() checking
  PLAYWRIGHT_BROWSERS_PATH + default Playwright cache paths for
  chromium-* / chromium_headless_shell-* dirs; wire into
  check_browser_requirements() for local mode (cloud providers
  unaffected). _run_browser_command fails fast with an actionable
  Docker vs. host message instead of hanging. _running_in_docker()
  checks /.dockerenv and /proc/1/cgroup.
- hermes_cli/tools_config.py: post_setup for 'Local Browser' now runs
  'agent-browser install --with-deps' after npm install to actually
  download Chromium. In Docker, points user at the updated image pull
  instead of trying to install into a read-only layer. Cloud-provider
  post_setup (browserbase) skips Chromium install entirely.
- tests/tools/test_browser_chromium_check.py: new tests covering
  search roots, install detection, requirements branches (local/cloud/
  camofox), and the fast-fail guard in docker/non-docker contexts.
- tests/tools/test_browser_homebrew_paths.py: 5 existing subprocess-path
  tests now mock _chromium_installed=True since they exercise the
  post-guard subprocess path.

Co-authored-by: teknium1 <teknium@users.noreply.github.com>
2026-04-28 07:03:44 -07:00

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"""Tests for macOS Homebrew PATH discovery in browser_tool.py."""
import json
import os
import subprocess
from pathlib import Path
from unittest.mock import patch, MagicMock, mock_open
import pytest
from tools.browser_tool import (
_discover_homebrew_node_dirs,
_find_agent_browser,
_run_browser_command,
_SANE_PATH,
check_browser_requirements,
)
import tools.browser_tool as _bt
@pytest.fixture(autouse=True)
def _clear_browser_caches():
"""Clear lru_cache and manual caches between tests."""
_discover_homebrew_node_dirs.cache_clear()
_bt._cached_agent_browser = None
_bt._agent_browser_resolved = False
yield
_discover_homebrew_node_dirs.cache_clear()
_bt._cached_agent_browser = None
_bt._agent_browser_resolved = False
class TestSanePath:
"""Verify _SANE_PATH includes fallback directories used by browser_tool."""
def test_includes_termux_bin(self):
assert "/data/data/com.termux/files/usr/bin" in _SANE_PATH.split(os.pathsep)
def test_includes_termux_sbin(self):
assert "/data/data/com.termux/files/usr/sbin" in _SANE_PATH.split(os.pathsep)
def test_includes_homebrew_bin(self):
assert "/opt/homebrew/bin" in _SANE_PATH.split(os.pathsep)
def test_includes_homebrew_sbin(self):
assert "/opt/homebrew/sbin" in _SANE_PATH.split(os.pathsep)
def test_includes_standard_dirs(self):
path_parts = _SANE_PATH.split(os.pathsep)
assert "/usr/local/bin" in path_parts
assert "/usr/bin" in path_parts
assert "/bin" in path_parts
class TestDiscoverHomebrewNodeDirs:
"""Tests for _discover_homebrew_node_dirs()."""
def test_returns_empty_when_no_homebrew(self):
"""Non-macOS systems without /opt/homebrew/opt should return empty."""
with patch("os.path.isdir", return_value=False):
assert _discover_homebrew_node_dirs() == ()
def test_finds_versioned_node_dirs(self):
"""Should discover node@20/bin, node@24/bin etc."""
entries = ["node@20", "node@24", "openssl", "node", "python@3.12"]
def mock_isdir(p):
if p == "/opt/homebrew/opt":
return True
# node@20/bin and node@24/bin exist
if p in (
"/opt/homebrew/opt/node@20/bin",
"/opt/homebrew/opt/node@24/bin",
):
return True
return False
with patch("os.path.isdir", side_effect=mock_isdir), \
patch("os.listdir", return_value=entries):
result = _discover_homebrew_node_dirs()
assert len(result) == 2
assert "/opt/homebrew/opt/node@20/bin" in result
assert "/opt/homebrew/opt/node@24/bin" in result
def test_excludes_plain_node(self):
"""'node' (unversioned) should be excluded — covered by /opt/homebrew/bin."""
with patch("os.path.isdir", return_value=True), \
patch("os.listdir", return_value=["node"]):
result = _discover_homebrew_node_dirs()
assert result == ()
def test_handles_oserror_gracefully(self):
"""Should return empty list if listdir raises OSError."""
with patch("os.path.isdir", return_value=True), \
patch("os.listdir", side_effect=OSError("Permission denied")):
assert _discover_homebrew_node_dirs() == ()
class TestFindAgentBrowser:
"""Tests for _find_agent_browser() Homebrew path search."""
def test_finds_in_current_path(self):
"""Should return result from shutil.which if available on current PATH."""
with patch("shutil.which", return_value="/usr/local/bin/agent-browser"):
assert _find_agent_browser() == "/usr/local/bin/agent-browser"
def test_finds_in_homebrew_bin(self):
"""Should search Homebrew dirs when not found on current PATH."""
def mock_which(cmd, path=None):
if path and "/opt/homebrew/bin" in path and cmd == "agent-browser":
return "/opt/homebrew/bin/agent-browser"
return None
with patch("shutil.which", side_effect=mock_which), \
patch("os.path.isdir", return_value=True), \
patch(
"tools.browser_tool._discover_homebrew_node_dirs",
return_value=[],
):
result = _find_agent_browser()
assert result == "/opt/homebrew/bin/agent-browser"
def test_finds_npx_in_homebrew(self):
"""Should find npx in Homebrew paths as a fallback."""
def mock_which(cmd, path=None):
if cmd == "agent-browser":
return None
if cmd == "npx":
if path and "/opt/homebrew/bin" in path:
return "/opt/homebrew/bin/npx"
return None
return None
# Mock Path.exists() to prevent the local node_modules check from matching
original_path_exists = Path.exists
def mock_path_exists(self):
if "node_modules" in str(self) and "agent-browser" in str(self):
return False
return original_path_exists(self)
with patch("shutil.which", side_effect=mock_which), \
patch("os.path.isdir", return_value=True), \
patch.object(Path, "exists", mock_path_exists), \
patch(
"tools.browser_tool._discover_homebrew_node_dirs",
return_value=[],
):
result = _find_agent_browser()
assert result == "npx agent-browser"
def test_finds_npx_in_termux_fallback_path(self):
"""Should find npx when only Termux fallback dirs are available."""
def mock_which(cmd, path=None):
if cmd == "agent-browser":
return None
if cmd == "npx":
if path and "/data/data/com.termux/files/usr/bin" in path:
return "/data/data/com.termux/files/usr/bin/npx"
return None
return None
original_path_exists = Path.exists
def mock_path_exists(self):
if "node_modules" in str(self) and "agent-browser" in str(self):
return False
return original_path_exists(self)
real_isdir = os.path.isdir
def selective_isdir(path):
if path in (
"/data/data/com.termux/files/usr/bin",
"/data/data/com.termux/files/usr/sbin",
):
return True
return real_isdir(path)
with patch("shutil.which", side_effect=mock_which), \
patch("os.path.isdir", side_effect=selective_isdir), \
patch.object(Path, "exists", mock_path_exists), \
patch(
"tools.browser_tool._discover_homebrew_node_dirs",
return_value=[],
):
result = _find_agent_browser()
assert result == "npx agent-browser"
def test_raises_when_not_found(self):
"""Should raise FileNotFoundError when nothing works."""
original_path_exists = Path.exists
def mock_path_exists(self):
if "node_modules" in str(self) and "agent-browser" in str(self):
return False
return original_path_exists(self)
with patch("shutil.which", return_value=None), \
patch("os.path.isdir", return_value=False), \
patch.object(Path, "exists", mock_path_exists), \
patch(
"tools.browser_tool._discover_homebrew_node_dirs",
return_value=[],
):
with pytest.raises(FileNotFoundError, match="agent-browser CLI not found"):
_find_agent_browser()
class TestBrowserRequirements:
def test_termux_requires_real_agent_browser_install_not_npx_fallback(self, monkeypatch):
monkeypatch.setenv("TERMUX_VERSION", "0.118.3")
monkeypatch.setenv("PREFIX", "/data/data/com.termux/files/usr")
monkeypatch.setattr("tools.browser_tool._is_camofox_mode", lambda: False)
monkeypatch.setattr("tools.browser_tool._get_cloud_provider", lambda: None)
monkeypatch.setattr("tools.browser_tool._find_agent_browser", lambda: "npx agent-browser")
assert check_browser_requirements() is False
class TestRunBrowserCommandTermuxFallback:
def test_termux_local_mode_rejects_bare_npx_fallback(self, monkeypatch):
monkeypatch.setenv("TERMUX_VERSION", "0.118.3")
monkeypatch.setenv("PREFIX", "/data/data/com.termux/files/usr")
monkeypatch.setattr("tools.browser_tool._find_agent_browser", lambda: "npx agent-browser")
monkeypatch.setattr("tools.browser_tool._get_cloud_provider", lambda: None)
result = _run_browser_command("task-1", "navigate", ["https://example.com"])
assert result["success"] is False
assert "bare npx fallback" in result["error"]
assert "agent-browser install" in result["error"]
class TestRunBrowserCommandPathConstruction:
"""Verify _run_browser_command() includes Homebrew node dirs in subprocess PATH."""
def test_subprocess_preserves_executable_path_with_spaces(self, tmp_path):
"""A local agent-browser path containing spaces must stay one argv entry."""
captured_cmd = None
mock_proc = MagicMock()
mock_proc.returncode = 0
mock_proc.wait.return_value = 0
def capture_popen(cmd, **kwargs):
nonlocal captured_cmd
captured_cmd = cmd
return mock_proc
fake_session = {
"session_name": "test-session",
"session_id": "test-id",
"cdp_url": None,
}
fake_json = json.dumps({"success": True})
browser_path = "/Users/test/Library/Application Support/hermes/node_modules/.bin/agent-browser"
hermes_home = str(tmp_path / "hermes-home")
with patch("tools.browser_tool._find_agent_browser", return_value=browser_path), \
patch("tools.browser_tool._chromium_installed", return_value=True), \
patch("tools.browser_tool._get_session_info", return_value=fake_session), \
patch("tools.browser_tool._socket_safe_tmpdir", return_value=str(tmp_path)), \
patch("tools.browser_tool._discover_homebrew_node_dirs", return_value=[]), \
patch("hermes_constants.Path.home", return_value=tmp_path), \
patch("subprocess.Popen", side_effect=capture_popen), \
patch("os.open", return_value=99), \
patch("os.close"), \
patch("tools.interrupt.is_interrupted", return_value=False), \
patch.dict(
os.environ,
{
"PATH": "/usr/bin:/bin",
"HOME": "/home/test",
"HERMES_HOME": hermes_home,
},
clear=True,
):
with patch("builtins.open", mock_open(read_data=fake_json)):
_run_browser_command("test-task", "navigate", ["https://example.com"])
assert captured_cmd is not None
assert captured_cmd[0] == browser_path
assert captured_cmd[1:5] == [
"--session",
"test-session",
"--json",
"navigate",
]
def test_subprocess_splits_npx_fallback_into_command_and_package(self, tmp_path):
"""The synthetic npx fallback should still expand into separate argv items."""
captured_cmd = None
mock_proc = MagicMock()
mock_proc.returncode = 0
mock_proc.wait.return_value = 0
def capture_popen(cmd, **kwargs):
nonlocal captured_cmd
captured_cmd = cmd
return mock_proc
fake_session = {
"session_name": "test-session",
"session_id": "test-id",
"cdp_url": None,
}
fake_json = json.dumps({"success": True})
hermes_home = str(tmp_path / "hermes-home")
with patch("tools.browser_tool._find_agent_browser", return_value="npx agent-browser"), \
patch("tools.browser_tool._chromium_installed", return_value=True), \
patch("tools.browser_tool._get_session_info", return_value=fake_session), \
patch("tools.browser_tool._socket_safe_tmpdir", return_value=str(tmp_path)), \
patch("tools.browser_tool._discover_homebrew_node_dirs", return_value=[]), \
patch("hermes_constants.Path.home", return_value=tmp_path), \
patch("subprocess.Popen", side_effect=capture_popen), \
patch("os.open", return_value=99), \
patch("os.close"), \
patch("tools.interrupt.is_interrupted", return_value=False), \
patch.dict(
os.environ,
{
"PATH": "/usr/bin:/bin",
"HOME": "/home/test",
"HERMES_HOME": hermes_home,
},
clear=True,
):
with patch("builtins.open", mock_open(read_data=fake_json)):
_run_browser_command("test-task", "navigate", ["https://example.com"])
assert captured_cmd is not None
assert captured_cmd[:2] == ["npx", "agent-browser"]
assert captured_cmd[2:6] == [
"--session",
"test-session",
"--json",
"navigate",
]
def test_subprocess_path_includes_homebrew_node_dirs(self, tmp_path):
"""When _discover_homebrew_node_dirs returns dirs, they should appear
in the subprocess env PATH passed to Popen."""
captured_env = {}
# Create a mock Popen that captures the env dict
mock_proc = MagicMock()
mock_proc.returncode = 0
mock_proc.wait.return_value = 0
def capture_popen(cmd, **kwargs):
captured_env.update(kwargs.get("env", {}))
return mock_proc
fake_session = {
"session_name": "test-session",
"session_id": "test-id",
"cdp_url": None,
}
# Write fake JSON output to the stdout temp file
fake_json = json.dumps({"success": True})
stdout_file = tmp_path / "stdout"
stdout_file.write_text(fake_json)
fake_homebrew_dirs = [
"/opt/homebrew/opt/node@24/bin",
"/opt/homebrew/opt/node@20/bin",
]
# We need os.path.isdir to return True for our fake dirs
# but we also need real isdir for tmp_path operations
real_isdir = os.path.isdir
def selective_isdir(p):
if p in fake_homebrew_dirs or p.startswith(str(tmp_path)):
return True
if "/opt/homebrew/" in p:
return True # _SANE_PATH dirs
return real_isdir(p)
with patch("tools.browser_tool._find_agent_browser", return_value="/usr/local/bin/agent-browser"), \
patch("tools.browser_tool._chromium_installed", return_value=True), \
patch("tools.browser_tool._get_session_info", return_value=fake_session), \
patch("tools.browser_tool._socket_safe_tmpdir", return_value=str(tmp_path)), \
patch("tools.browser_tool._discover_homebrew_node_dirs", return_value=fake_homebrew_dirs), \
patch("os.path.isdir", side_effect=selective_isdir), \
patch("subprocess.Popen", side_effect=capture_popen), \
patch("os.open", return_value=99), \
patch("os.close"), \
patch("tools.interrupt.is_interrupted", return_value=False), \
patch.dict(os.environ, {"PATH": "/usr/bin:/bin", "HOME": "/home/test"}, clear=True):
# The function reads from temp files for stdout/stderr
with patch("builtins.open", mock_open(read_data=fake_json)):
_run_browser_command("test-task", "navigate", ["https://example.com"])
# Verify Homebrew node dirs made it into the subprocess PATH
result_path = captured_env.get("PATH", "")
assert "/opt/homebrew/opt/node@24/bin" in result_path
assert "/opt/homebrew/opt/node@20/bin" in result_path
assert "/opt/homebrew/bin" in result_path # from _SANE_PATH
def test_subprocess_path_includes_sane_path_homebrew(self, tmp_path):
"""_SANE_PATH Homebrew entries should appear even without versioned node dirs."""
captured_env = {}
mock_proc = MagicMock()
mock_proc.returncode = 0
mock_proc.wait.return_value = 0
def capture_popen(cmd, **kwargs):
captured_env.update(kwargs.get("env", {}))
return mock_proc
fake_session = {
"session_name": "test-session",
"session_id": "test-id",
"cdp_url": None,
}
fake_json = json.dumps({"success": True})
real_isdir = os.path.isdir
def selective_isdir(p):
if "/opt/homebrew/" in p:
return True
if p.startswith(str(tmp_path)):
return True
return real_isdir(p)
with patch("tools.browser_tool._find_agent_browser", return_value="/usr/local/bin/agent-browser"), \
patch("tools.browser_tool._chromium_installed", return_value=True), \
patch("tools.browser_tool._get_session_info", return_value=fake_session), \
patch("tools.browser_tool._socket_safe_tmpdir", return_value=str(tmp_path)), \
patch("tools.browser_tool._discover_homebrew_node_dirs", return_value=[]), \
patch("os.path.isdir", side_effect=selective_isdir), \
patch("subprocess.Popen", side_effect=capture_popen), \
patch("os.open", return_value=99), \
patch("os.close"), \
patch("tools.interrupt.is_interrupted", return_value=False), \
patch.dict(os.environ, {"PATH": "/usr/bin:/bin", "HOME": "/home/test"}, clear=True):
with patch("builtins.open", mock_open(read_data=fake_json)):
_run_browser_command("test-task", "navigate", ["https://example.com"])
result_path = captured_env.get("PATH", "")
assert "/opt/homebrew/bin" in result_path
assert "/opt/homebrew/sbin" in result_path
def test_subprocess_path_includes_termux_fallback_dirs(self, tmp_path):
"""Termux fallback dirs should survive browser PATH rebuilding."""
captured_env = {}
mock_proc = MagicMock()
mock_proc.returncode = 0
mock_proc.wait.return_value = 0
def capture_popen(cmd, **kwargs):
captured_env.update(kwargs.get("env", {}))
return mock_proc
fake_session = {
"session_name": "test-session",
"session_id": "test-id",
"cdp_url": None,
}
fake_json = json.dumps({"success": True})
real_isdir = os.path.isdir
def selective_isdir(path):
if path in (
"/data/data/com.termux/files/usr/bin",
"/data/data/com.termux/files/usr/sbin",
):
return True
if path.startswith(str(tmp_path)):
return True
return real_isdir(path)
with patch("tools.browser_tool._find_agent_browser", return_value="/usr/local/bin/agent-browser"), \
patch("tools.browser_tool._chromium_installed", return_value=True), \
patch("tools.browser_tool._get_session_info", return_value=fake_session), \
patch("tools.browser_tool._socket_safe_tmpdir", return_value=str(tmp_path)), \
patch("tools.browser_tool._discover_homebrew_node_dirs", return_value=[]), \
patch("os.path.isdir", side_effect=selective_isdir), \
patch("subprocess.Popen", side_effect=capture_popen), \
patch("os.open", return_value=99), \
patch("os.close"), \
patch("tools.interrupt.is_interrupted", return_value=False), \
patch.dict(os.environ, {"PATH": "/usr/bin:/bin", "HOME": "/home/test"}, clear=True):
with patch("builtins.open", mock_open(read_data=fake_json)):
_run_browser_command("test-task", "navigate", ["https://example.com"])
result_path = captured_env.get("PATH", "")
assert "/data/data/com.termux/files/usr/bin" in result_path
assert "/data/data/com.termux/files/usr/sbin" in result_path
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