module search path broken for test_libuv_api.py

[paulwouters]

• uvloop version: 0.17.0
• Python version: 3.11
• Platform: Linux Fedora 37 / rawhide
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: unknown
• Does uvloop behave differently from vanilla asyncio? How?: unknown

The test fails to find the module cython_helper

Workaround:

sed -i "s:import sys:import sys\nsys.path.append\(os.path.abspath\(os.path.dirname\(__file__\)\)\)\n:" tests/__main__.py