fix applicaiton_uri handling in tests

asyncua/client/client.py

@@ -268,7 +268,7 @@ class Client:
         if discovery_configuration is provided, the newer register_server2 service call is used
         """
         serv = ua.RegisteredServer()
-        serv.ServerUri = server.application_uri
+        serv.ServerUri = server.get_application_uri()
         serv.ProductUri = server.product_uri
         serv.DiscoveryUrls = [server.endpoint.geturl()]
         serv.ServerType = server.application_type

asyncua/server/server.py

@@ -126,6 +126,9 @@ class Server:
         """
         self.iserver.disabled_clock = val
 
+    def get_application_uri(self):
+        return self._application_uri
+
     async def set_application_uri(self, uri: str):
         """
         Set application/server URI.

tests/test_server.py

@@ -23,7 +23,7 @@ async def test_discovery(server, discovery_server):
     async with client:
         servers = await client.find_servers()
         new_app_uri = 'urn:freeopcua:python:server:test_discovery'
-        server.application_uri = new_app_uri
+        await server.set_application_uri(new_app_uri)
         await server.register_to_discovery(discovery_server.endpoint.geturl(), 0)
         # let server register registration
         await asyncio.sleep(0.1)
@@ -38,10 +38,10 @@ async def test_find_servers2(server, discovery_server):
     async with client:
         servers = await client.find_servers()
         new_app_uri1 = 'urn:freeopcua:python:server:test_discovery1'
-        server.application_uri = new_app_uri1
+        await server.set_application_uri(new_app_uri1)
         await server.register_to_discovery(discovery_server.endpoint.geturl(), period=0)
         new_app_uri2 = 'urn:freeopcua:python:test_discovery2'
-        server.application_uri = new_app_uri2
+        await server.set_application_uri(new_app_uri2)
         await server.register_to_discovery(discovery_server.endpoint.geturl(), period=0)
         await asyncio.sleep(0.1)  # let server register registration
         new_servers = await client.find_servers()