import tempfile
from unittest.mock import patch
import pytest
import yaml
from devserver_mcp.config import load_config
from devserver_mcp.manager import DevServerManager
def test_playwright_import_error_when_module_not_installed():
config_data = {
"servers": {
"test": {
"command": "echo test",
"port": 8000,
}
},
"experimental": {"playwright": True},
}
with tempfile.NamedTemporaryFile(mode="w", suffix=".yml", delete=False) as f:
yaml.dump(config_data, f)
f.flush()
config = load_config(f.name)
original_import = __builtins__["__import__"]
def mock_import(name, *args, **kwargs):
if name == "devserver_mcp.playwright":
raise ModuleNotFoundError("No module named 'playwright'")
return original_import(name, *args, **kwargs)
with patch("builtins.__import__", side_effect=mock_import):
manager = DevServerManager(config)
assert manager.playwright_enabled is True
assert manager._playwright_operator is None
assert manager.playwright_running is False
assert manager._playwright_init_error is not None
@pytest.mark.asyncio
async def test_playwright_commands_error_when_module_not_installed():
config_data = {
"servers": {
"test": {
"command": "echo test",
"port": 8000,
}
},
"experimental": {"playwright": True},
}
with tempfile.NamedTemporaryFile(mode="w", suffix=".yml", delete=False) as f:
yaml.dump(config_data, f)
f.flush()
config = load_config(f.name)
original_import = __builtins__["__import__"]
def mock_import(name, *args, **kwargs):
if name == "devserver_mcp.playwright":
raise ModuleNotFoundError("No module named 'playwright'")
return original_import(name, *args, **kwargs)
with patch("builtins.__import__", side_effect=mock_import):
manager = DevServerManager(config)
result = await manager.playwright_navigate("http://example.com")
assert result["status"] == "error"
assert "Playwright not available" in result["message"]
result = await manager.playwright_snapshot()
assert result["status"] == "error"
assert "Playwright not available" in result["message"]
result = await manager.playwright_console_messages()
assert result["status"] == "error"
assert "Playwright not available" in result["message"]
@pytest.mark.asyncio
async def test_ui_shows_error_state_when_playwright_module_missing():
config_data = {
"servers": {
"test": {
"command": "echo test",
"port": 8000,
}
},
"experimental": {"playwright": True},
}
with tempfile.NamedTemporaryFile(mode="w", suffix=".yml", delete=False) as f:
yaml.dump(config_data, f)
f.flush()
config = load_config(f.name)
log_messages = []
async def track_notify_log(box, time, message):
log_messages.append((box, time, message))
original_import = __builtins__["__import__"]
def mock_import(name, *args, **kwargs):
if name == "devserver_mcp.playwright":
raise ModuleNotFoundError("No module named 'playwright'")
return original_import(name, *args, **kwargs)
with patch("builtins.__import__", side_effect=mock_import):
manager = DevServerManager(config)
manager._notify_log = track_notify_log
await manager.autostart_configured_servers()
assert manager._playwright_operator is None
assert manager.playwright_running is False
error_logs = [msg for box, time, msg in log_messages if "Playwright" in box and "Failed" in msg]
assert len(error_logs) > 0, "UI did not receive error notification for missing Playwright module"
