diff --git a/tests/test_core/test_server.py b/tests/test_core/test_server.py
index d86f5b53e..c59cdecf6 100644
--- a/tests/test_core/test_server.py
+++ b/tests/test_core/test_server.py
@@ -1,7 +1,7 @@
 from mock import patch
 import sure  # noqa
 
-from moto.server import main
+from moto.server import main, create_backend_app, DomainDispatcherApplication
 
 
 def test_wrong_arguments():
@@ -27,3 +27,21 @@ def test_port_argument(run_simple):
     func_call = run_simple.call_args[0]
     func_call[0].should.equal("0.0.0.0")
     func_call[1].should.equal(8080)
+
+
+def test_domain_dispatched():
+    dispatcher = DomainDispatcherApplication(create_backend_app)
+    backend_app = dispatcher.get_application("email.us-east1.amazonaws.com")
+    backend_app.view_functions.keys()[0].should.equal('EmailResponse.dispatch')
+
+
+def test_domain_without_matches():
+    dispatcher = DomainDispatcherApplication(create_backend_app)
+    dispatcher.get_application.when.called_with("not-matching-anything.com").should.throw(RuntimeError)
+
+
+def test_domain_dispatched_with_service():
+    # If we pass a particular service, always return that.
+    dispatcher = DomainDispatcherApplication(create_backend_app, service="s3")
+    backend_app = dispatcher.get_application("s3.us-east1.amazonaws.com")
+    backend_app.view_functions.keys()[0].should.equal('ResponseObject.key_response')