diff --git a/spec/common_helper.rb b/spec/common_helper.rb
new file mode 100644
index 0000000..347e720
--- /dev/null
+++ b/spec/common_helper.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+ENV['RAILS_ENV'] ||= 'test'
+
+require 'support/coverage'
+
+require 'active_record/railtie'
+require 'debug'
+require 'rating'
+
+require 'support/common'
+require 'support/mysql'
+require 'support/database_cleaner'
+require 'support/factory_bot'
+require 'support/migrate'
+require 'support/models'
diff --git a/spec/config/rate_table_spec.rb b/spec/config/rate_table_spec.rb
index a050a2f..3f1b9f5 100644
--- a/spec/config/rate_table_spec.rb
+++ b/spec/config/rate_table_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Config, '.rate_table' do
   if ENV['CONFIG_ENABLED'] != 'true'
     context 'when rating.yml does not exist' do
diff --git a/spec/config/rating_table_spec.rb b/spec/config/rating_table_spec.rb
index c9fa426..0627185 100644
--- a/spec/config/rating_table_spec.rb
+++ b/spec/config/rating_table_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Config, '.rating_table' do
   if ENV['CONFIG_ENABLED'] != 'true'
     context 'when rating.yml does not exist' do
diff --git a/spec/config/validations_spec.rb b/spec/config/validations_spec.rb
index 1336744..72a5b28 100644
--- a/spec/config/validations_spec.rb
+++ b/spec/config/validations_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Config, '.validations' do
   if ENV['CONFIG_ENABLED_WITH_EXTRA_SCOPES'] != 'true'
     context 'when rating.yml does not exist' do
diff --git a/spec/models/extension/after_create_spec.rb b/spec/models/extension/after_create_spec.rb
index cf14e90..4f801c5 100644
--- a/spec/models/extension/after_create_spec.rb
+++ b/spec/models/extension/after_create_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, 'after_create' do
   context 'when record is author' do
     let!(:record) { build :author }
diff --git a/spec/models/extension/order_by_rating_spec.rb b/spec/models/extension/order_by_rating_spec.rb
index 46449a0..a39f018 100644
--- a/spec/models/extension/order_by_rating_spec.rb
+++ b/spec/models/extension/order_by_rating_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, ':order_by_rating' do
diff --git a/spec/models/extension/rate_for_spec.rb b/spec/models/extension/rate_for_spec.rb
index 577fa40..7204337 100644
--- a/spec/models/extension/rate_for_spec.rb
+++ b/spec/models/extension/rate_for_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, ':rate_for' do
   let!(:author)  { create :author }
   let!(:article) { create :article }
diff --git a/spec/models/extension/rate_spec.rb b/spec/models/extension/rate_spec.rb
index 6ee12c1..3c37fb7 100644
--- a/spec/models/extension/rate_spec.rb
+++ b/spec/models/extension/rate_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, ':rate' do
   let!(:author)  { create :author }
   let!(:article) { create :article }
diff --git a/spec/models/extension/rated_question_spec.rb b/spec/models/extension/rated_question_spec.rb
index f03505d..d5ad62e 100644
--- a/spec/models/extension/rated_question_spec.rb
+++ b/spec/models/extension/rated_question_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, ':rated?' do
   let!(:author) { create :author }
   let!(:resource) { create :article }
diff --git a/spec/models/extension/rated_records_spec.rb b/spec/models/extension/rated_records_spec.rb
index 8883431..1fda090 100644
--- a/spec/models/extension/rated_records_spec.rb
+++ b/spec/models/extension/rated_records_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, '.rated_records' do
diff --git a/spec/models/extension/rated_spec.rb b/spec/models/extension/rated_spec.rb
index 44739ca..5ccfd98 100644
--- a/spec/models/extension/rated_spec.rb
+++ b/spec/models/extension/rated_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, ':rated' do
diff --git a/spec/models/extension/rates_records_spec.rb b/spec/models/extension/rates_records_spec.rb
index 90c6e6b..b5c0aa2 100644
--- a/spec/models/extension/rates_records_spec.rb
+++ b/spec/models/extension/rates_records_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, '.rates_records' do
diff --git a/spec/models/extension/rates_spec.rb b/spec/models/extension/rates_spec.rb
index 65ff6c5..cdb3eb3 100644
--- a/spec/models/extension/rates_spec.rb
+++ b/spec/models/extension/rates_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, ':rates' do
diff --git a/spec/models/extension/rating_records_spec.rb b/spec/models/extension/rating_records_spec.rb
index 78f9fbc..a88be30 100644
--- a/spec/models/extension/rating_records_spec.rb
+++ b/spec/models/extension/rating_records_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, '.rating' do
diff --git a/spec/models/extension/rating_spec.rb b/spec/models/extension/rating_spec.rb
index a0a0cf2..aaaf59d 100644
--- a/spec/models/extension/rating_spec.rb
+++ b/spec/models/extension/rating_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Extension, '.rating' do
diff --git a/spec/models/extension/rating_warm_up_spec.rb b/spec/models/extension/rating_warm_up_spec.rb
index 3040000..3466744 100644
--- a/spec/models/extension/rating_warm_up_spec.rb
+++ b/spec/models/extension/rating_warm_up_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, '.rating_warm_up' do
   context 'when scoping is nil' do
     context 'when update is made' do
diff --git a/spec/models/extension/unscoped_rating_spec.rb b/spec/models/extension/unscoped_rating_spec.rb
index 29a8f08..3f068e3 100644
--- a/spec/models/extension/unscoped_rating_spec.rb
+++ b/spec/models/extension/unscoped_rating_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, 'unscoped_rating' do
   let!(:author_1) { create :author }
   let!(:author_2) { create :author }
diff --git a/spec/models/extension/where_spec.rb b/spec/models/extension/where_spec.rb
index ed56bde..aba4f66 100644
--- a/spec/models/extension/where_spec.rb
+++ b/spec/models/extension/where_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Extension, 'unscoped_rating' do
   let!(:author_1) { create :author }
   let!(:author_2) { create :author }
diff --git a/spec/models/rate/create_spec.rb b/spec/models/rate/create_spec.rb
index fd63c4f..64beecc 100644
--- a/spec/models/rate/create_spec.rb
+++ b/spec/models/rate/create_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Rate, ':create' do
   let!(:author)  { create :author }
   let!(:article) { create :article }
diff --git a/spec/models/rate/rate_for_spec.rb b/spec/models/rate/rate_for_spec.rb
index ede6c50..02b0375 100644
--- a/spec/models/rate/rate_for_spec.rb
+++ b/spec/models/rate/rate_for_spec.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
-
 RSpec.describe Rating::Rate, ':rate_for' do
   let!(:author)  { create :author }
   let!(:article) { create :article }
diff --git a/spec/models/rate_spec.rb b/spec/models/rate_spec.rb
index 95231d6..ed91f53 100644
--- a/spec/models/rate_spec.rb
+++ b/spec/models/rate_spec.rb
@@ -1,27 +1,27 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
+require 'support/shoulda'
 
 RSpec.describe Rating::Rate do
-  let!(:object) { build :rating_rate }
+  let!(:object) { build(:rating_rate) }
 
-  it { expect(object).to be_valid }
+  it { expect(object.valid?).to be(true) }
 
-  it { is_expected.to belong_to :author }
-  it { is_expected.to belong_to :resource }
-  it { is_expected.to belong_to :scopeable }
+  it { is_expected.to belong_to(:author) }
+  it { is_expected.to belong_to(:resource) }
+  it { is_expected.to belong_to(:scopeable) }
 
-  it { is_expected.to validate_presence_of :author }
-  it { is_expected.to validate_presence_of :resource }
-  it { is_expected.to validate_presence_of :value }
+  it { is_expected.to validate_presence_of(:author) }
+  it { is_expected.to validate_presence_of(:resource) }
+  it { is_expected.to validate_presence_of(:value) }
 
   it do
-    expect(subject).to validate_numericality_of(:value).is_less_than_or_equal_to(100).is_less_than_or_equal_to 100
+    expect(subject).to validate_numericality_of(:value).is_less_than_or_equal_to(100).is_less_than_or_equal_to(100)
   end
 
   it do
     scopes = %i[author_type resource_id resource_type scopeable_id scopeable_type]
-    scopes += %i[scope_1 scope_2] if ENV['CONFIG_ENABLED_WITH_EXTRA_SCOPES'] == 'true'
+    scopes += %i[scope_1 scope_2] if ENV.fetch('CONFIG_ENABLED_WITH_EXTRA_SCOPES', 'false') == 'true'
 
     expect(object).to validate_uniqueness_of(:author_id).scoped_to(scopes).case_insensitive
   end
diff --git a/spec/models/rating/averager_data_spec.rb b/spec/models/rating/averager_data_spec.rb
index e95e325..a6a95e5 100644
--- a/spec/models/rating/averager_data_spec.rb
+++ b/spec/models/rating/averager_data_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Rating, ':averager_data' do
diff --git a/spec/models/rating/data_spec.rb b/spec/models/rating/data_spec.rb
index b2674ff..f3726c8 100644
--- a/spec/models/rating/data_spec.rb
+++ b/spec/models/rating/data_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Rating, ':data' do
diff --git a/spec/models/rating/update_rating_spec.rb b/spec/models/rating/update_rating_spec.rb
index 1dc8992..8c3bb25 100644
--- a/spec/models/rating/update_rating_spec.rb
+++ b/spec/models/rating/update_rating_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Rating, ':update_rating' do
diff --git a/spec/models/rating/values_data_spec.rb b/spec/models/rating/values_data_spec.rb
index ac4dee1..12a824e 100644
--- a/spec/models/rating/values_data_spec.rb
+++ b/spec/models/rating/values_data_spec.rb
@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
 require 'support/shared_context/with_database_records'
 
 RSpec.describe Rating::Rating, ':values_data' do
diff --git a/spec/models/rating_spec.rb b/spec/models/rating_spec.rb
index eeaf788..5a1de9c 100644
--- a/spec/models/rating_spec.rb
+++ b/spec/models/rating_spec.rb
@@ -1,20 +1,20 @@
 # frozen_string_literal: true
 
-require 'rails_helper'
+require 'support/shoulda'
 
-RSpec.describe Rating::Rating do
-  let!(:object) { build :rating_rating }
+RSpec.describe Rating::Rating, type: :model do
+  let!(:object) { build(:rating_rating) }
 
-  it { expect(object).to be_valid }
+  it { expect(object.valid?).to be(true) }
 
-  it { is_expected.to belong_to :resource }
-  it { is_expected.to belong_to :scopeable }
+  it { is_expected.to belong_to(:resource) }
+  it { is_expected.to belong_to(:scopeable) }
 
-  it { is_expected.to validate_presence_of :average }
-  it { is_expected.to validate_presence_of :estimate }
-  it { is_expected.to validate_presence_of :resource }
-  it { is_expected.to validate_presence_of :sum }
-  it { is_expected.to validate_presence_of :total }
+  it { is_expected.to validate_presence_of(:average) }
+  it { is_expected.to validate_presence_of(:estimate) }
+  it { is_expected.to validate_presence_of(:resource) }
+  it { is_expected.to validate_presence_of(:sum) }
+  it { is_expected.to validate_presence_of(:total) }
 
   it do
     expect(object).to validate_uniqueness_of(:resource_id)
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
deleted file mode 100644
index 9a291f0..0000000
--- a/spec/rails_helper.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-# frozen_string_literal: true
-
-ENV['RAILS_ENV'] ||= 'test'
-
-require 'active_record/railtie'
-require 'mysql2'
-require 'rating'
-
-client = Mysql2::Client.new(host: '127.0.0.1', username: :root)
-
-client.query 'DROP DATABASE IF EXISTS rating_test;'
-client.query 'CREATE DATABASE IF NOT EXISTS rating_test;'
-
-ActiveRecord::Base.establish_connection adapter: :mysql2, database: :rating_test, username: :root, host: '127.0.0.1'
-
-Dir[File.expand_path('support/**/*.rb', __dir__)].each { |file| require file }
diff --git a/spec/support/common.rb b/spec/support/common.rb
index d601c1b..3d62209 100644
--- a/spec/support/common.rb
+++ b/spec/support/common.rb
@@ -3,20 +3,8 @@
 require 'rspec/rails'
 
 RSpec.configure do |config|
-  config.filter_run_when_matching :focus
-
   config.disable_monkey_patching!
   config.infer_spec_type_from_file_location!
 
-  config.expect_with :rspec do |expectations|
-    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
-  end
-
-  config.mock_with :rspec do |mocks|
-    mocks.verify_partial_doubles = true
-  end
-
-  config.infer_base_class_for_anonymous_controllers = false
-  config.order                                      = :random
-  config.profile_examples                           = true
+  config.order = :random
 end
diff --git a/spec/support/models.rb b/spec/support/models.rb
new file mode 100644
index 0000000..f0b8c56
--- /dev/null
+++ b/spec/support/models.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+Dir[File.expand_path('models/*.rb', __dir__)].each { |file| require file }
diff --git a/spec/support/shared_context/with_database_records.rb b/spec/support/shared_context/with_database_records.rb
index 087212a..c7df02a 100644
--- a/spec/support/shared_context/with_database_records.rb
+++ b/spec/support/shared_context/with_database_records.rb
@@ -1,20 +1,20 @@
 # frozen_string_literal: true
 
 RSpec.shared_context 'with_database_records' do
-  let!(:category) { create :category }
+  let!(:category) { create(:category) }
 
-  let!(:author_1) { create :author }
-  let!(:author_2) { create :author }
+  let!(:author_1) { create(:author) }
+  let!(:author_2) { create(:author) }
 
-  let!(:article_1) { create :article }
-  let!(:article_2) { create :article }
-  let!(:article_3) { create :article }
+  let!(:article_1) { create(:article) }
+  let!(:article_2) { create(:article) }
+  let!(:article_3) { create(:article) }
 
-  let!(:rate_1) { create :rating_rate, author: author_1, resource: article_1, value: 100 }
-  let!(:rate_2) { create :rating_rate, author: author_1, resource: article_2, value: 11 }
-  let!(:rate_3) { create :rating_rate, author: author_1, resource: article_3, value: 10 }
-  let!(:rate_4) { create :rating_rate, author: author_2, resource: article_1, value: 1 }
+  let!(:rate_1) { create(:rating_rate, author: author_1, resource: article_1, value: 100) }
+  let!(:rate_2) { create(:rating_rate, author: author_1, resource: article_2, value: 11) }
+  let!(:rate_3) { create(:rating_rate, author: author_1, resource: article_3, value: 10) }
+  let!(:rate_4) { create(:rating_rate, author: author_2, resource: article_1, value: 1) }
 
-  let!(:rate_5) { create :rating_rate, author: author_1, resource: article_1, scopeable: category, value: 1 }
-  let!(:rate_6) { create :rating_rate, author: author_2, resource: article_1, scopeable: category, value: 2 }
+  let!(:rate_5) { create(:rating_rate, author: author_1, resource: article_1, scopeable: category, value: 1) }
+  let!(:rate_6) { create(:rating_rate, author: author_2, resource: article_1, scopeable: category, value: 2) }
 end