Move autocorrection specs into a describe block

It's harder to read specs when "no offense" examples, "offense message" examples
and autocorrection examples are mixed together.

Author: bquorning

spec/rubocop/cop/rails/validation_spec.rb

@@ -3,6 +3,10 @@
 RSpec.describe RuboCop::Cop::Rails::Validation do
   subject(:cop) { described_class.new }
 
+  it 'accepts new style validations' do
+    expect_no_offenses('validates :name')
+  end
+
   described_class::DENYLIST.each_with_index do |validation, number|
     it "registers an offense for #{validation}" do
       inspect_source("#{validation} :name")
@@ -16,36 +20,34 @@
     end
   end
 
-  described_class::TYPES.each do |parameter|
-    it "autocorrect validates_#{parameter}_of" do
+  describe 'autocorrect' do
+    described_class::TYPES.each do |parameter|
+      it "corrects validates_#{parameter}_of" do
+        new_source = autocorrect_source(
+          "validates_#{parameter}_of :full_name, :birth_date"
+        )
+        expect(new_source).to eq(
+          "validates :full_name, :birth_date, #{parameter}: true"
+        )
+      end
+    end
+
+    it 'corrects validates_numericality_of with options' do
       new_source = autocorrect_source(
-        "validates_#{parameter}_of :full_name, :birth_date"
+        'validates_numericality_of :age, minimum: 0, maximum: 122'
       )
       expect(new_source).to eq(
-        "validates :full_name, :birth_date, #{parameter}: true"
+        'validates :age, numericality: { minimum: 0, maximum: 122 }'
       )
     end
-  end
-
-  it 'accepts new style validations' do
-    expect_no_offenses('validates :name')
-  end
 
-  it 'autocorrect validates_length_of' do
-    new_source = autocorrect_source(
-      'validates_numericality_of :age, minimum: 0, maximum: 122'
-    )
-    expect(new_source).to eq(
-      'validates :age, numericality: { minimum: 0, maximum: 122 }'
-    )
-  end
-
-  it 'autocorrect validates_numericality_of with options in braces' do
-    new_source = autocorrect_source(
-      'validates_numericality_of :age, { minimum: 0, maximum: 122 }'
-    )
-    expect(new_source).to eq(
-      'validates :age, numericality: { minimum: 0, maximum: 122 }'
-    )
+    it 'autocorrect validates_numericality_of with options in braces' do
+      new_source = autocorrect_source(
+        'validates_numericality_of :age, { minimum: 0, maximum: 122 }'
+      )
+      expect(new_source).to eq(
+        'validates :age, numericality: { minimum: 0, maximum: 122 }'
+      )
+    end
   end
 end