Integrate with asyncio tests

src/python/grpcio_tests/tests_aio/unit/BUILD.bazel

@@ -19,8 +19,27 @@ package(
 
 GRPC_ASYNC_TESTS = [
     "server_test.py",
+    "init_test.py",
+    "channel_test.py",
 ]
 
+py_library(
+    name = "test_base",
+    srcs = ["test_base.py"],
+    srcs_version = "PY3",
+)
+
+py_library(
+    name = "sync_server",
+    srcs = ["sync_server.py"],
+    deps = [
+        "//src/proto/grpc/testing:empty_py_pb2",
+        "//src/proto/grpc/testing:py_messages_proto",
+        "//src/proto/grpc/testing:test_py_pb2_grpc",
+    ],
+    srcs_version = "PY3",
+)
+
 [
     py_test(
         name=test_file_name[:-3],
@@ -33,6 +52,9 @@ GRPC_ASYNC_TESTS = [
             "//src/proto/grpc/testing:py_messages_proto",
             "//src/proto/grpc/testing:benchmark_service_py_pb2_grpc",
             "//src/proto/grpc/testing:benchmark_service_py_pb2",
+            "//src/python/grpcio_tests/tests/unit/framework/common",
+            ":test_base",
+            ":sync_server",
             "//external:six"
         ],
         imports=["../../",],

src/python/grpcio_tests/tests_aio/unit/test_base.py

@@ -22,21 +22,11 @@ import socket
 
 from grpc.experimental import aio
 from tests_aio.unit import sync_server
-
+from tests.unit.framework.common import get_socket
 
 def _get_free_loopback_tcp_port():
-    if socket.has_ipv6:
+    host, port, sock = get_socket(listen=False)
-        tcp_socket = socket.socket(socket.AF_INET6)
+    return sock, "{}:{}".format(host, port)
-        host = "::1"
-        host_target = "[::1]"
-    else:
-        tcp_socket = socket.socket(socket.AF_INET)
-        host = "127.0.0.1"
-        host_target = host
-    tcp_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
-    tcp_socket.bind((host, 0))
-    address_tuple = tcp_socket.getsockname()
-    return tcp_socket, "%s:%s" % (host_target, address_tuple[1])
 
 
 class _Server: