Improve tests found by assert_nil

Author: bf4

test/action_controller/serialization_scope_name_test.rb

@@ -128,7 +128,7 @@ def test_defined_serialization_scope
     end
 
     def test_defined_serialization_scope_object
-      assert_equal @controller.view_context.class, @controller.serialization_scope.class
+      assert_equal @controller.view_context.controller, @controller.serialization_scope.controller
     end
 
     def test_serialization_scope_non_admin

test/active_model_serializers/railtie_test_isolated.rb

@@ -8,7 +8,9 @@ class WithRails < RailtieTest
     setup do
       require 'rails'
       require 'active_model_serializers'
-      make_basic_app
+      make_basic_app do |app|
+        app.config.action_controller.perform_caching = true
+      end
     end
 
     test 'mixes ActionController::Serialization into ActionController::Base' do
@@ -32,17 +34,17 @@ class WithRails < RailtieTest
 
     test 'it is configured for caching' do
       assert_equal ActionController::Base.cache_store, ActiveModelSerializers.config.cache_store
-      expected = Rails.configuration.action_controller.perform_caching
-      actual = ActiveModelSerializers.config.perform_caching
-      assert_nil expected
-      assert_nil actual
+      assert_equal true, Rails.configuration.action_controller.perform_caching
+      assert_equal true, ActiveModelSerializers.config.perform_caching
     end
   end
 
   class WithoutRails < RailtieTest
     setup do
       require 'active_model_serializers'
-      make_basic_app
+      make_basic_app do |app|
+        app.config.action_controller.perform_caching = true
+      end
     end
 
     test 'does not mix ActionController::Serialization into ActionController::Base' do
@@ -59,8 +61,8 @@ class WithoutRails < RailtieTest
     test 'it is not configured for caching' do
       refute_nil ActionController::Base.cache_store
       assert_nil ActiveModelSerializers.config.cache_store
-      refute Rails.configuration.action_controller.perform_caching
-      refute ActiveModelSerializers.config.perform_caching
+      assert_equal true, Rails.configuration.action_controller.perform_caching
+      assert_nil ActiveModelSerializers.config.perform_caching
     end
   end
 end