diff --git a/config/routes.rb b/config/routes.rb
index 0950f78..88f7962 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 
-Rails.application.routes.draw do
-  get :switch_user, to: 'switch_user#set_current_user'
-  get 'switch_user/remember_user', to: 'switch_user#remember_user'
-end
+Rails
+  .application
+  .routes
+  .draw do
+    get :switch_user, to: 'switch_user#set_current_user'
+    get 'switch_user/remember_user', to: 'switch_user#remember_user'
+  end
diff --git a/lib/switch_user/provider.rb b/lib/switch_user/provider.rb
index 8bdecbd..bea145a 100644
--- a/lib/switch_user/provider.rb
+++ b/lib/switch_user/provider.rb
@@ -12,12 +12,7 @@ module Provider
     autoload :Session, 'switch_user/provider/session'
 
     def self.init(controller)
-      klass_part =
-        if SwitchUser.provider.is_a?(Hash)
-          SwitchUser.provider[:name]
-        else
-          SwitchUser.provider
-        end
+      klass_part = SwitchUser.provider.is_a?(Hash) ? SwitchUser.provider[:name] : SwitchUser.provider
 
       klass_part = klass_part.to_s.classify
 
diff --git a/lib/switch_user/provider/base.rb b/lib/switch_user/provider/base.rb
index 44e0dc1..4e63639 100644
--- a/lib/switch_user/provider/base.rb
+++ b/lib/switch_user/provider/base.rb
@@ -4,10 +4,12 @@ module SwitchUser
   module Provider
     class Base
       def current_users_without_scope
-        SwitchUser.available_scopes.each_with_object([]) do |scope, users|
-          user = current_user(scope)
-          users << user if user
-        end
+        SwitchUser
+          .available_scopes
+          .each_with_object([]) do |scope, users|
+            user = current_user(scope)
+            users << user if user
+          end
       end
 
       def login_exclusive(user, args)
@@ -25,9 +27,7 @@ def login_inclusive(user, args)
       end
 
       def logout_all
-        SwitchUser.available_scopes.each do |scope|
-          logout(scope)
-        end
+        SwitchUser.available_scopes.each { |scope| logout(scope) }
       end
 
       def original_user
diff --git a/lib/switch_user/rails.rb b/lib/switch_user/rails.rb
index 7264c8c..d4e0792 100644
--- a/lib/switch_user/rails.rb
+++ b/lib/switch_user/rails.rb
@@ -3,11 +3,7 @@
 module SwitchUser
   class Engine < Rails::Engine
     initializer 'switch_user.view' do
-      config.to_prepare do
-        ActiveSupport.on_load(:action_view) do
-          include SwitchUserHelper
-        end
-      end
+      config.to_prepare { ActiveSupport.on_load(:action_view) { include SwitchUserHelper } }
     end
   end
 end
diff --git a/lib/switch_user/rspec/feature_helpers.rb b/lib/switch_user/rspec/feature_helpers.rb
index d9e1854..199ce75 100644
--- a/lib/switch_user/rspec/feature_helpers.rb
+++ b/lib/switch_user/rspec/feature_helpers.rb
@@ -15,9 +15,10 @@ def switch_user(user_record_or_scope, user_id = nil)
 
       _user_scope = _user_scope.to_s
 
-      raise SwitchUser::InvalidScope,
-            "don't allow this user sign in, please check config.available_users" unless SwitchUser.available_scopes
-        .include?(_user_scope) || SwitchUser.available_scopes.include?(_user_scope.to_sym)
+      unless SwitchUser.available_scopes.include?(_user_scope) ||
+               SwitchUser.available_scopes.include?(_user_scope.to_sym)
+        raise SwitchUser::InvalidScope, "don't allow this user sign in, please check config.available_users"
+      end
 
       _user_id =
         case user_record_or_scope
@@ -25,8 +26,10 @@ def switch_user(user_record_or_scope, user_id = nil)
           identifier =
             SwitchUser.available_users_identifiers[_user_scope] ||
               SwitchUser.available_users_identifiers[_user_scope.to_sym]
-          raise SwitchUser::InvalidScope,
-                "don't allow switch this user, please check config.available_users_identifiers" if identifier.nil?
+          if identifier.nil?
+            raise SwitchUser::InvalidScope,
+                  "don't allow switch this user, please check config.available_users_identifiers"
+          end
 
           user_record_or_scope.send identifier
         else
diff --git a/lib/switch_user/user_set.rb b/lib/switch_user/user_set.rb
index b30b44f..3671a9c 100644
--- a/lib/switch_user/user_set.rb
+++ b/lib/switch_user/user_set.rb
@@ -11,9 +11,7 @@ def self.init_from_config
     end
 
     def self.users
-      init_from_config.flat_map do |user_set|
-        user_set.users.map { |user| Record.build(user, user_set) }
-      end
+      init_from_config.flat_map { |user_set| user_set.users.map { |user| Record.build(user, user_set) } }
     end
 
     attr_reader :scope, :user_class, :identifier, :label, :base_scope
@@ -39,11 +37,7 @@ def users
     private
 
     def normalize_class(klass)
-      if klass.is_a?(Class)
-        klass
-      else
-        klass.to_s.classify.constantize
-      end
+      klass.is_a?(Class) ? klass : klass.to_s.classify.constantize
     end
 
     def normalize_scope(scope)
diff --git a/spec/controllers/switch_user_controller_spec.rb b/spec/controllers/switch_user_controller_spec.rb
index be935d0..aa5bc89 100644
--- a/spec/controllers/switch_user_controller_spec.rb
+++ b/spec/controllers/switch_user_controller_spec.rb
@@ -5,9 +5,7 @@
 require 'switch_user_controller'
 
 RSpec.describe SwitchUserController, type: :controller do
-  before do
-    SwitchUser.provider = :dummy
-  end
+  before { SwitchUser.provider = :dummy }
 
   let(:admin) { double(:admin, admin?: true) }
   let(:provider) { double(:provider, original_user: admin, current_user: nil) }
@@ -27,9 +25,8 @@
 
     describe 'requests with a privileged original_user' do
       before do
-        SwitchUser.controller_guard = lambda do |current_user, _, original_user|
-          current_user.try(:admin?) || original_user.try(:admin?)
-        end
+        SwitchUser.controller_guard =
+          lambda { |current_user, _, original_user| current_user.try(:admin?) || original_user.try(:admin?) }
       end
       it 'allows access using the original_user param' do
         allow(controller).to receive(:provider).and_return(provider)
diff --git a/spec/helpers/switch_user_helper_spec.rb b/spec/helpers/switch_user_helper_spec.rb
index 6afbc1e..4a4e4db 100644
--- a/spec/helpers/switch_user_helper_spec.rb
+++ b/spec/helpers/switch_user_helper_spec.rb
@@ -5,9 +5,7 @@
 require 'switch_user_helper'
 
 RSpec.describe SwitchUserHelper, type: :helper do
-  before do
-    SwitchUser.provider = :dummy
-  end
+  before { SwitchUser.provider = :dummy }
 
   let(:user) { double(:user, id: 1) }
   let(:admin) { double(:admin, id: 1) }
diff --git a/spec/integration/switch_user_spec.rb b/spec/integration/switch_user_spec.rb
index 3d2dc98..cedbc3b 100644
--- a/spec/integration/switch_user_spec.rb
+++ b/spec/integration/switch_user_spec.rb
@@ -29,9 +29,10 @@
   context 'using switch_back' do
     before do
       SwitchUser.switch_back = true
-      SwitchUser.controller_guard = lambda do |current_user, _request, original_user|
-        current_user && current_user.admin? || original_user && original_user.admin?
-      end
+      SwitchUser.controller_guard =
+        lambda do |current_user, _request, original_user|
+          current_user && current_user.admin? || original_user && original_user.admin?
+        end
     end
 
     it 'can switch back to a different user through remember_user endpoint' do
@@ -84,13 +85,9 @@
     end
 
     context 'when non-default identifier' do
-      before do
-        SwitchUser.available_users_identifiers = { user: :email }
-      end
+      before { SwitchUser.available_users_identifiers = { user: :email } }
 
-      after do
-        SwitchUser.available_users_identifiers = { user: :id }
-      end
+      after { SwitchUser.available_users_identifiers = { user: :id } }
 
       it 'can switch back to a different user through remember_user endpoint' do
         # login
diff --git a/spec/provider/session_spec.rb b/spec/provider/session_spec.rb
index a9eea3d..498980f 100644
--- a/spec/provider/session_spec.rb
+++ b/spec/provider/session_spec.rb
@@ -10,9 +10,7 @@ def current_user
 end
 
 RSpec.describe SwitchUser::Provider::Session do
-  before do
-    SwitchUser.session_key = :uid
-  end
+  before { SwitchUser.session_key = :uid }
   let(:controller) { SessionController.new }
   let(:provider) { SwitchUser::Provider::Session.new(controller) }
 
diff --git a/spec/rspec/feature_helpers_spec.rb b/spec/rspec/feature_helpers_spec.rb
index 8af4f2c..ffe7539 100644
--- a/spec/rspec/feature_helpers_spec.rb
+++ b/spec/rspec/feature_helpers_spec.rb
@@ -27,9 +27,7 @@
   scenario 'when controller_guard return false' do
     allow(SwitchUser).to receive(:controller_guard).and_return(->(_current_user, _request) { false })
 
-    expect do
-      switch_user @user
-    end.not_to raise_error
+    expect { switch_user @user }.not_to raise_error
   end
 
   scenario 'when controller_guard return false and controller call original available?' do
@@ -37,46 +35,34 @@
 
     allow_any_instance_of(SwitchUserController).to receive(:available?).and_call_original
 
-    expect do
-      switch_user @user
-    end.to raise_error ActionController::RoutingError, /Do not try to hack us/
+    expect { switch_user @user }.to raise_error ActionController::RoutingError, /Do not try to hack us/
   end
 
   scenario 'arg is @user, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user @user
-    end.not_to raise_error
+    expect { switch_user @user }.not_to raise_error
   end
 
   scenario 'arg is @user, available_users is default, and available_users_identifiers is {user: id}' do
     allow(SwitchUser).to receive(:available_users_identifiers).and_return(user: :id)
 
-    expect do
-      switch_user @user
-    end.not_to raise_error
+    expect { switch_user @user }.not_to raise_error
   end
 
   scenario 'arg is @user, available_users is default, and available_users_identifiers is {:client => :id}' do
     allow(SwitchUser).to receive(:available_users_identifiers).and_return(client: :id)
     allow(SwitchUser).to receive(:available_users_names).and_return(client: :email)
 
-    expect do
-      switch_user @user
-    end.to raise_error SwitchUser::InvalidScope, /config.available_users_identifiers/
+    expect { switch_user @user }.to raise_error SwitchUser::InvalidScope, /config.available_users_identifiers/
   end
 
   scenario 'arg is @client, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user @client
-    end.to raise_error SwitchUser::InvalidScope, /config.available_users/
+    expect { switch_user @client }.to raise_error SwitchUser::InvalidScope, /config.available_users/
   end
 
   scenario 'arg is @client, available_users is {:user => lambda { User.all }, :client => lambda {Client.all}}, and available_users_identifiers is default' do
     allow(SwitchUser).to receive(:available_users).and_return(user: -> { User.all }, client: -> { Client.all })
 
-    expect do
-      switch_user @client
-    end.to raise_error SwitchUser::InvalidScope, /config.available_users_identifiers/
+    expect { switch_user @client }.to raise_error SwitchUser::InvalidScope, /config.available_users_identifiers/
   end
 
   scenario 'arg is @client, available_users is {:user => lambda { User.all }, :client => lambda {Client.all}}, and available_users_identifiers is {:user => id, :client => id}' do
@@ -85,44 +71,31 @@
     allow(SwitchUser).to receive(:available_users_identifiers).and_return(user: :id, client: :id)
     allow(SwitchUser).to receive(:available_users_names).and_return(user: :email, client: :email)
 
-    expect do
-      switch_user @client
-    end.not_to raise_error
+    expect { switch_user @client }.not_to raise_error
   end
 
   scenario 'args is :user and @user.id, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user :user, @user.id
-    end.not_to raise_error
+    expect { switch_user :user, @user.id }.not_to raise_error
   end
 
   scenario 'arg is :client and @client.id, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user :client, @client.id
-    end.to raise_error SwitchUser::InvalidScope, /config.available_users/
+    expect { switch_user :client, @client.id }.to raise_error SwitchUser::InvalidScope, /config.available_users/
   end
 
   scenario 'args is :user, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user :user
-    end.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument, /user_id is empty/
+    expect { switch_user :user }.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument, /user_id is empty/
   end
 
   scenario 'args is :user and nil, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user :user, nil
-    end.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument, /user_id is empty/
+    expect { switch_user :user, nil }.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument,
+                /user_id is empty/
   end
 
   scenario "args is :user and '', available_users is default, and available_users_identifiers is default" do
-    expect do
-      switch_user :user, ''
-    end.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument, /user_id is empty/
+    expect { switch_user :user, '' }.to raise_error SwitchUser::RSpecFeatureHelpers::InvalidArgument, /user_id is empty/
   end
 
   scenario 'args is :user and 0, available_users is default, and available_users_identifiers is default' do
-    expect do
-      switch_user :user, 0
-    end.not_to raise_error
+    expect { switch_user :user, 0 }.not_to raise_error
   end
 end
diff --git a/spec/support/application.rb b/spec/support/application.rb
index bb9b5ae..c8d5363 100644
--- a/spec/support/application.rb
+++ b/spec/support/application.rb
@@ -68,15 +68,18 @@ class Application < Rails::Application
 end
 
 Rails.application.initialize!
-Rails.application.routes.draw do
-  get 'dummy/protected', to: 'dummy#protected'
-  get 'dummy/open', to: 'dummy#open'
-  post 'login', to: 'dummy#login'
-  get 'logout', to: 'dummy#logout'
-  get 'authenticated', to: 'dummy#authenticated'
-  get :switch_user, to: 'switch_user#set_current_user'
-  get 'switch_user/remember_user', to: 'switch_user#remember_user'
-end
+Rails
+  .application
+  .routes
+  .draw do
+    get 'dummy/protected', to: 'dummy#protected'
+    get 'dummy/open', to: 'dummy#open'
+    post 'login', to: 'dummy#login'
+    get 'logout', to: 'dummy#logout'
+    get 'authenticated', to: 'dummy#authenticated'
+    get :switch_user, to: 'switch_user#set_current_user'
+    get 'switch_user/remember_user', to: 'switch_user#remember_user'
+  end
 
 connection = ActiveRecord::Base.connection
 connection.create_table :users do |t|