diff --git a/gapic-generator-cloud/templates/cloud/wrapper_gem/client_test.erb b/gapic-generator-cloud/templates/cloud/wrapper_gem/client_test.erb
index a9c0a4b4c..7cd0a3eda 100644
--- a/gapic-generator-cloud/templates/cloud/wrapper_gem/client_test.erb
+++ b/gapic-generator-cloud/templates/cloud/wrapper_gem/client_test.erb
@@ -12,11 +12,21 @@ require "gapic/rest"
 <%- end -%>
 
 class <%= gem.namespace %>::ClientConstructionMinitest < Minitest::Test
+  class DummyStub
+    def endpoint
+      "endpoint.example.com"
+    end
+
+    def universe_domain
+      "example.com"
+    end
+  end
+
 <%- start_line_spacer -%>
 <%- gem.services.each do |service| -%>
 <%- if service.generate_grpc_clients? -%>
 <%= line_spacer %>  def test_<%= service.factory_method_name %>_grpc
-    Gapic::ServiceStub.stub :new, :stub do
+    Gapic::ServiceStub.stub :new, DummyStub.new do
       grpc_channel = GRPC::Core::Channel.new "localhost:8888", nil, :this_channel_is_insecure
       client = <%= gem.namespace %>.<%= service.factory_method_name %><% if service.supports_multiple_transports? %> transport: :grpc<% end %> do |config|
         config.credentials = grpc_channel
@@ -27,7 +37,7 @@ class <%= gem.namespace %>::ClientConstructionMinitest < Minitest::Test
 <%- end -%>
 <%- if service.generate_rest_clients? -%>
 <%= line_spacer %>  def test_<%= service.factory_method_name %>_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = <%= gem.namespace %>.<%= service.factory_method_name %><% if service.supports_multiple_transports? %> transport: :rest<% end %> do |config|
         config.credentials = :dummy_credentials
       end
diff --git a/shared/output/cloud/compute_small_wrapper/test/google/cloud/compute/client_test.rb b/shared/output/cloud/compute_small_wrapper/test/google/cloud/compute/client_test.rb
index ee2c20674..71bcc2545 100644
--- a/shared/output/cloud/compute_small_wrapper/test/google/cloud/compute/client_test.rb
+++ b/shared/output/cloud/compute_small_wrapper/test/google/cloud/compute/client_test.rb
@@ -22,8 +22,18 @@
 require "gapic/rest"
 
 class Google::Cloud::Compute::ClientConstructionMinitest < Minitest::Test
+  class DummyStub
+    def endpoint
+      "endpoint.example.com"
+    end
+
+    def universe_domain
+      "example.com"
+    end
+  end
+
   def test_addresses_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Compute.addresses do |config|
         config.credentials = :dummy_credentials
       end
@@ -32,7 +42,7 @@ def test_addresses_rest
   end
 
   def test_region_operations_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Compute.region_operations do |config|
         config.credentials = :dummy_credentials
       end
@@ -41,7 +51,7 @@ def test_region_operations_rest
   end
 
   def test_region_instance_group_managers_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Compute.region_instance_group_managers do |config|
         config.credentials = :dummy_credentials
       end
@@ -50,7 +60,7 @@ def test_region_instance_group_managers_rest
   end
 
   def test_networks_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Compute.networks do |config|
         config.credentials = :dummy_credentials
       end
@@ -59,7 +69,7 @@ def test_networks_rest
   end
 
   def test_global_operations_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Compute.global_operations do |config|
         config.credentials = :dummy_credentials
       end
diff --git a/shared/output/cloud/language_wrapper/test/google/cloud/language/client_test.rb b/shared/output/cloud/language_wrapper/test/google/cloud/language/client_test.rb
index 831b338cd..e417ec836 100644
--- a/shared/output/cloud/language_wrapper/test/google/cloud/language/client_test.rb
+++ b/shared/output/cloud/language_wrapper/test/google/cloud/language/client_test.rb
@@ -23,8 +23,18 @@
 require "gapic/rest"
 
 class Google::Cloud::Language::ClientConstructionMinitest < Minitest::Test
+  class DummyStub
+    def endpoint
+      "endpoint.example.com"
+    end
+
+    def universe_domain
+      "example.com"
+    end
+  end
+
   def test_language_service_grpc
-    Gapic::ServiceStub.stub :new, :stub do
+    Gapic::ServiceStub.stub :new, DummyStub.new do
       grpc_channel = GRPC::Core::Channel.new "localhost:8888", nil, :this_channel_is_insecure
       client = Google::Cloud::Language.language_service transport: :grpc do |config|
         config.credentials = grpc_channel
@@ -34,7 +44,7 @@ def test_language_service_grpc
   end
 
   def test_language_service_rest
-    Gapic::Rest::ClientStub.stub :new, :stub do
+    Gapic::Rest::ClientStub.stub :new, DummyStub.new do
       client = Google::Cloud::Language.language_service transport: :rest do |config|
         config.credentials = :dummy_credentials
       end
diff --git a/shared/output/cloud/secretmanager_wrapper/test/google/cloud/secret_manager/client_test.rb b/shared/output/cloud/secretmanager_wrapper/test/google/cloud/secret_manager/client_test.rb
index 6d059a4b1..aebca0989 100644
--- a/shared/output/cloud/secretmanager_wrapper/test/google/cloud/secret_manager/client_test.rb
+++ b/shared/output/cloud/secretmanager_wrapper/test/google/cloud/secret_manager/client_test.rb
@@ -22,8 +22,18 @@
 require "gapic/grpc"
 
 class Google::Cloud::SecretManager::ClientConstructionMinitest < Minitest::Test
+  class DummyStub
+    def endpoint
+      "endpoint.example.com"
+    end
+
+    def universe_domain
+      "example.com"
+    end
+  end
+
   def test_secret_manager_service_grpc
-    Gapic::ServiceStub.stub :new, :stub do
+    Gapic::ServiceStub.stub :new, DummyStub.new do
       grpc_channel = GRPC::Core::Channel.new "localhost:8888", nil, :this_channel_is_insecure
       client = Google::Cloud::SecretManager.secret_manager_service do |config|
         config.credentials = grpc_channel