diff --git a/.rubocop.yml b/.rubocop.yml
index 18d16da..7ba9188 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -11,7 +11,7 @@ AllCops:
   Exclude:
     - bin/*
     - gemfiles/*
-    - spec/**/*
+    - spec/dummy/**/*
 
 Gemspec/RequireMFA:
   Enabled: false
@@ -47,3 +47,10 @@ Layout/EmptyLinesAroundBlockBody:
 
 Layout/EmptyLinesAroundModuleBody:
   Enabled: false
+
+#########
+# RSPEC #
+#########
+
+RSpec/MultipleExpectations:
+  Max: 3
diff --git a/spec/acts_as_xlsx/macros_spec.rb b/spec/acts_as_xlsx/macros_spec.rb
index e11fd2c..05a4f36 100644
--- a/spec/acts_as_xlsx/macros_spec.rb
+++ b/spec/acts_as_xlsx/macros_spec.rb
@@ -1,11 +1,13 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
-RSpec.describe 'Basic tests' do
+RSpec.describe ActsAsXlsx::Macros do
 
   describe 'to_xlsx_with_package' do
     let(:p) { Post.to_xlsx }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       Post.to_xlsx package: p, name: 'another posts'
       expect(p.workbook.worksheets.size).to eq 2
     end
@@ -14,13 +16,13 @@
   describe 'to_xlsx_with_name' do
     let(:p) { Post.to_xlsx name: 'bob' }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(p.workbook.worksheets.first.name).to eq 'bob'
     end
   end
 
   describe 'xlsx_columns' do
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(Post.xlsx_columns).to eq Post.column_names.map(&:to_sym)
     end
   end
@@ -28,26 +30,26 @@
   describe 'to_xslx_vanilla' do
     let(:p) { Post.to_xlsx }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(p.workbook.worksheets.first.rows.first.cells.first.value).to eq 'Id'
       expect(p.workbook.worksheets.first.rows.last.cells.first.value).to eq 2
     end
   end
 
   describe 'to_xslx_with_provided_data' do
-    let(:p) { Post.to_xlsx data: Post.where(title: "This is the first post").all }
+    let(:p) { Post.to_xlsx data: Post.where(title: 'This is the first post').all }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(p.workbook.worksheets.first.rows.first.cells.first.value).to eq 'Id'
       expect(p.workbook.worksheets.first.rows.last.cells.first.value).to eq 1
     end
   end
 
   describe 'columns' do
-    let(:p) { Post.to_xlsx columns: [:name, :title, :content, :votes] }
+    let(:p) { Post.to_xlsx columns: %i[name title content votes] }
     let(:sheet) { p.workbook.worksheets.first }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(sheet.rows.first.cells.size).to eq Post.xlsx_columns.size - 3
       expect(sheet.rows.first.cells.first.value).to eq 'Name'
       expect(sheet.rows.last.cells.last.value).to eq 7
@@ -55,20 +57,20 @@
   end
 
   describe 'method_in_columns' do
-    let(:p) { Post.to_xlsx columns: [:name, :votes, :content, :ranking] }
+    let(:p) { Post.to_xlsx columns: %i[name votes content ranking] }
     let(:sheet) { p.workbook.worksheets.first }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(sheet.rows.first.cells.first.value).to eq 'Name'
       expect(sheet.rows.last.cells.last.value).to eq Post.last.ranking
     end
   end
 
   describe 'chained_method' do
-    let(:p) { Post.to_xlsx columns: [:name, :votes, :content, :ranking, :'comments.last.content', :'comments.first.author.name'] }
+    let(:p) { Post.to_xlsx columns: %i[name votes content ranking comments.last.content comments.first.author.name] }
     let(:sheet) { p.workbook.worksheets.first }
 
-    it 'should return xslx data' do
+    it 'returns xslx data' do
       expect(sheet.rows.first.cells.first.value).to eq 'Name'
       expect(sheet.rows.last.cells.last.value).to eq Post.last.comments.last.author.name
     end
diff --git a/spec/config_rspec.rb b/spec/config_rspec.rb
index 2ff8172..0abea7a 100644
--- a/spec/config_rspec.rb
+++ b/spec/config_rspec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Configure RSpec
 RSpec.configure do |config|
   # Use DB agnostic schema by default