adding automated tests

Could we add a test (similar to the other ones in bash_test.go), that performs two bash tool calls/handler invocations?
One would launch a python http server on port 8123, and the second handler call would curl that port and check if it received an error.

@ThomasK33 I didn't know we hadsetupWorkspaceForAgent! Thanks for spotting. I added integration tests and temporarily rebased onto your timeout branch until its merged. The tests don't spawn a python server though - I don't want to make our test suite depend on python.