bpo-35352: test_asyncio uses the certificate set from the test directory (GH-10826)

Modify asyncio tests to utilize the certificates from the test directory
instead of its own set, as they are the same and with each update they had
to be updated as well.

Author: stratakis

Lib/test/test_asyncio/keycert3.pem

@@ -40,7 +40,7 @@ def data_file(filename):
         fullname = os.path.join(support.TEST_HOME_DIR, filename)
         if os.path.isfile(fullname):
             return fullname
-    fullname = os.path.join(os.path.dirname(__file__), filename)
+    fullname = os.path.join(os.path.dirname(__file__), '..', filename)
     if os.path.isfile(fullname):
         return fullname
     raise FileNotFoundError(filename)
@@ -160,8 +160,8 @@ def finish_request(self, request, client_address):
         if not os.path.isdir(here):
             here = os.path.join(os.path.dirname(os.__file__),
                                 'test', 'test_asyncio')
-        keyfile = os.path.join(here, 'ssl_key.pem')
-        certfile = os.path.join(here, 'ssl_cert.pem')
+        keyfile = os.path.join(here, ONLYKEY)
+        certfile = os.path.join(here, ONLYCERT)
         context = ssl.SSLContext()
         context.load_cert_chain(certfile, keyfile)
 

Lib/test/test_asyncio/pycacert.pem

@@ -0,0 +1 @@
+Modify test_asyncio to use the certificate set from the test directory.