fix test without monkey patching

Gemfile

@@ -5,7 +5,7 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby "3.2.2"
 
-gem "mutex_m", "0.1.2"
+gem "mutex_m", "0.2.0"
 gem "cancancan", "~> 3.3"
 gem "jbuilder", "~> 2.7"
 gem "pg", "~> 1.1"

Gemfile.lock

@@ -288,7 +288,7 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    mutex_m (0.1.2)
+    mutex_m (0.2.0)
     net-imap (0.4.4)
       date
       net-protocol
@@ -620,7 +620,7 @@ DEPENDENCIES
   letter_opener
   listen (~> 3.3)
   mini_magick (>= 4.9.5)
-  mutex_m (= 0.1.2)
+  mutex_m (= 0.2.0)
   net-smtp
   omniauth (~> 1.9.1)
   omniauth-facebook

app/models/app_config.rb

@@ -12,8 +12,6 @@
 class AppConfig < ApplicationRecord
   acts_as_singleton
 
-  public_class_method :find_by!, :all
-
   def update_diapers_calculator(params)
     self.diapers_calculator = Calculators::DiapersService.product_attributes(params)
     save

spec/models/app_config_spec.rb

@@ -12,8 +12,6 @@
 require "rails_helper"
 
 RSpec.describe AppConfig, type: :model do
-  fixtures :app_configs
-
   context "is a singleton model" do
     it "should not allow using new method" do
       expect { AppConfig.new }.to raise_error NoMethodError
@@ -24,15 +22,14 @@
   end
 
   context "calls a service method" do
-    let(:app_config_instance) { app_configs(:initial_app_config) }
+    let(:app_config_instance) { AppConfig.instance }
     let(:diapers_calculator_params) { attributes_for(:diapers_calculator_params) }
     let(:updated_diapers_calculator) { attributes_for(:app_config, :updated) }
 
     it "updates the AppConfig instances diapers calculator" do
-      expect do
-        app_config_instance.update_diapers_calculator(diapers_calculator_params)
-        app_config_instance.reload
-      end.to change(app_config_instance, :diapers_calculator).to(updated_diapers_calculator[:diapers_calculator])
+      app_config_instance.update_diapers_calculator(diapers_calculator_params)
+
+      expect(app_config_instance[:diapers_calculator]).to eq(updated_diapers_calculator[:diapers_calculator])
     end
 
     it "receives product attributes" do

spec/requests/account/app_configs_spec.rb

@@ -2,7 +2,6 @@
 
 RSpec.describe Account::AppConfigsController, type: :request do
   include_context :authorize_admin
-  fixtures :app_configs
 
   describe "GET :edit" do
     it "is successful" do
@@ -14,16 +13,15 @@
   end
 
   describe "PATCH #update" do
-    let(:app_config_instance) { app_configs(:initial_app_config) }
+    let(:app_config_instance) { AppConfig.instance }
     let(:diapers_calculator_params) { attributes_for(:diapers_calculator_params) }
     let(:updated_diapers_calculator) { attributes_for(:app_config, :updated) }
 
     context "passed vaild params" do
+      before { patch account_app_config_path, params: diapers_calculator_params }
+
       it "updates the AppConfig instances diapers calculator" do
-        expect do
-          patch account_app_config_path, params: diapers_calculator_params
-          app_config_instance.reload
-        end.to change(app_config_instance, :diapers_calculator).to(updated_diapers_calculator[:diapers_calculator])
+        expect(app_config_instance[:diapers_calculator]).to eq(updated_diapers_calculator[:diapers_calculator])
       end
     end
   end