refactor uvloop detection in its own method

tests/test_app.py

@@ -9,6 +9,14 @@ from sanic.exceptions import SanicException
 from sanic.response import text
 
 
+def uvloop_installed():
+    try:
+        import uvloop
+        return True
+    except ImportError:
+        return False
+
+
 def test_app_loop_running(app):
     @app.get("/test")
     async def handler(request):
@@ -19,29 +27,20 @@ def test_app_loop_running(app):
     assert response.text == "pass"
 
 
-@pytest.mark.skipif(sys.version_info < (3, 7),
+@pytest.mark.skipif(sys.version_info < (3, 7) and uvloop_installed(),
                     reason="requires python3.7 or higher")
 def test_create_asyncio_server(app):
     loop = asyncio.get_event_loop()
     asyncio_srv_coro = app.create_server(
         return_asyncio_server=True)
     assert isawaitable(asyncio_srv_coro)
-
-    try:
-        import uvloop
-    except ImportError:
-        # this test is valid only for sanic + asyncio setup
     srv = loop.run_until_complete(asyncio_srv_coro)
     assert srv.is_serving() is True
 
 
-@pytest.mark.skipif(sys.version_info < (3, 7),
+@pytest.mark.skipif(sys.version_info < (3, 7) and uvloop_installed(),
                     reason="requires python3.7 or higher")
 def test_asyncio_server_start_serving(app):
-    try:
-        import uvloop
-    except ImportError:
-        # this test is valid only for sanic + asyncio setup
     loop = asyncio.get_event_loop()
     asyncio_srv_coro = app.create_server(
         return_asyncio_server=True,