We can run the whole asyncio tests by using this command:
./python -m test.test_asyncio

But this way depends on the Lib/test/test_asyncio/tests.txt which contains all the tests that need to be executed. The problem is the core developer may forget to modify the tests.txt if he/she wants to add new test in asyncio test suite. Guido may not forget about it. But Victor forgot to modify the tests.txt when he added test_subprocess.py in asyncio tests suite.

So the proposed patch removes dependency on tests.txt file. When core developers add new test in asyncio tests suite, they just need to add the new file in test_asyncio directory itself. This patch was inspired by Lib/test/test_json/__init__.py.