Add a rubocop rule to check if a method 'redirect_to' is used without explicitly set 'status' in 'destroy' actions of controllers

1 files changed, 86 insertions, 0 deletions

diff --git a/spec/rubocop/cop/redirect_with_status_spec.rb b/spec/rubocop/cop/redirect_with_status_spec.rb
new file mode 100644
index 00000000000..5ad63567f84
--- /dev/null
+++ b/spec/rubocop/cop/redirect_with_status_spec.rb
@@ -0,0 +1,86 @@
+require 'spec_helper'
+
+require 'rubocop'
+require 'rubocop/rspec/support'
+
+require_relative '../../../rubocop/cop/redirect_with_status'
+
+describe RuboCop::Cop::RedirectWithStatus do
+  include CopHelper
+
+  subject(:cop) { described_class.new }
+  let(:controller_fixture_without_status) do
+    %q(
+      class UserController < ApplicationController
+        def show
+          user = User.find(params[:id])
+          redirect_to user_path if user.name == 'John Wick'
+        end
+
+        def destroy
+          user = User.find(params[:id])
+
+          if user.destroy
+            redirect_to root_path
+          else
+            render :show
+          end
+        end
+      end
+    )
+  end
+
+  let(:controller_fixture_with_status) do
+    %q(
+      class UserController < ApplicationController
+        def show
+          user = User.find(params[:id])
+          redirect_to user_path if user.name == 'John Wick'
+        end
+
+        def destroy
+          user = User.find(params[:id])
+
+          if user.destroy
+            redirect_to root_path, status: 302
+          else
+            render :show
+          end
+        end
+      end
+    )
+  end
+
+  context 'in controller' do
+    before do
+      allow(cop).to receive(:in_controller?).and_return(true)
+    end
+
+    it 'registers an offense when a "destroy" action uses "redirect_to" without "status"' do
+      inspect_source(cop, controller_fixture_without_status)
+
+      aggregate_failures do
+        expect(cop.offenses.size).to eq(1)
+        expect(cop.offenses.map(&:line)).to eq([12]) # 'redirect_to' is located on 12th line in controller_fixture.
+        expect(cop.highlights).to eq(['redirect_to'])
+      end
+    end
+
+    it 'does not register an offense when a "destroy" action uses "redirect_to" with "status"' do
+      inspect_source(cop, controller_fixture_with_status)
+
+      aggregate_failures do
+        expect(cop.offenses.size).to eq(0)
+      end
+    end
+  end
+
+  context 'outside of controller' do
+    it 'registers no offense' do
+      inspect_source(cop, controller_fixture_without_status)
+      inspect_source(cop, controller_fixture_with_status)
+
+      expect(cop.offenses.size).to eq(0)
+    end
+  end
+end