- Use a local variable for the proxy URL instead of hardcoding it twice
- Pass proxy through the WebSearchTool constructor instead of mutating
after instantiation (matches real usage path)
- Add assertion that timeout is still forwarded correctly
- Use generic mock data instead of test-specific strings
The DuckDuckGo search provider instantiated DDGS(timeout=10) without
passing the configured proxy, making web_search unusable in environments
that require a proxy (e.g. behind GFW). DDGS supports a proxy parameter
and the proxy value is already available as self.proxy — it was simply
not forwarded.
Add a test verifying the proxy kwarg is forwarded to DDGS.