Refactor test cases of AnnotateRoutes as for Rake versions (#754)

.rubocop_todo.yml

 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2020-02-05 17:13:49 -1000 using RuboCop version 0.68.1.
+# on 2020-02-12 18:43:06 +0900 using RuboCop version 0.68.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -221,7 +221,7 @@ Naming/AccessorMethodName:
   Exclude:
     - 'lib/annotate.rb'
 
-# Offense count: 82
+# Offense count: 93
 # Configuration parameters: Blacklist.
 # Blacklist: (?-mix:(^|\s)(EO[A-Z]{1}|END)(\s|$))
 Naming/HeredocDelimiterNaming:
@@ -528,7 +528,7 @@ Style/UnneededPercentQ:
   Exclude:
     - 'annotate.gemspec'
 
-# Offense count: 353
+# Offense count: 344
 # Cop supports --auto-correct.
 # Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
 # URISchemes: http, https

spec/lib/annotate/annotate_routes_spec.rb

@@ -271,53 +271,165 @@ describe AnnotateRoutes do
     end
   end
 
-  describe 'When adding with older Rake versions' do
-    before(:each) do
+  describe 'As for Rake versions' do
+    before :each do
       expect(File).to receive(:exist?).with(ROUTE_FILE).and_return(true)
-      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return("(in /bad/line)\ngood line")
       expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
-      expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
+      expect(File).to receive(:read).with(ROUTE_FILE).and_return(route_file_content)
+
+      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return(rake_routes_result)
     end
 
-    it 'should annotate and add a newline!' do
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("ActionController::Routing...\nfoo")
-      expect(mock_file).to receive(:puts).with(/ActionController::Routing...\nfoo\n\n# == Route Map\n#\n# good line\n/)
-      AnnotateRoutes.do_annotations
+    context 'with older Rake versions' do
+      let :rake_routes_result do
+        <<~EOS.chomp
+          (in /bad/line)
+          good line
+        EOS
+      end
+
+      context 'When the route file does not end with an empty line' do
+        let :route_file_content do
+          <<~EOS.chomp
+            ActionController::Routing...
+            foo
+          EOS
+        end
+
+        let :expected_result do
+          <<~EOS
+            ActionController::Routing...
+            foo
+
+            # == Route Map
+            #
+            # good line
+          EOS
         end
 
-    it 'should not add a newline if there are empty lines' do
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("ActionController::Routing...\nfoo\n")
-      expect(mock_file).to receive(:puts).with(/ActionController::Routing...\nfoo\n\n# == Route Map\n#\n# good line\n/)
+        it 'annotates with an empty line' do
+          expect(mock_file).to receive(:puts).with(expected_result)
+          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
+
           AnnotateRoutes.do_annotations
         end
       end
 
-  describe 'When adding with newer Rake versions' do
-    before(:each) do
-      expect(File).to receive(:exist?).with(ROUTE_FILE).and_return(true)
-      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return("another good line\ngood line")
-      expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file)
+      context 'When the route file ends with an empty line' do
+        let :route_file_content do
+          <<~EOS
+            ActionController::Routing...
+            foo
+          EOS
+        end
+
+        let :expected_result do
+          <<~EOS
+            ActionController::Routing...
+            foo
+
+            # == Route Map
+            #
+            # good line
+          EOS
+        end
+
+        it 'annotates without an empty line' do
+          expect(mock_file).to receive(:puts).with(expected_result)
           expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
+
+          AnnotateRoutes.do_annotations
+        end
+      end
+    end
+
+    context 'with newer Rake versions' do
+      let :rake_routes_result do
+        <<~EOS.chomp
+          another good line
+          good line
+        EOS
+      end
+
+      context 'When the route file does not end with an empty line' do
+        context 'When no option is passed' do
+          let :route_file_content do
+            <<~EOS.chomp
+              ActionController::Routing...
+              foo
+            EOS
+          end
+
+          let :expected_result do
+            <<~EOS
+              ActionController::Routing...
+              foo
+
+              # == Route Map
+              #
+              # another good line
+              # good line
+            EOS
           end
 
-    it 'should annotate and add a newline!' do
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("ActionController::Routing...\nfoo")
-      expect(mock_file).to receive(:puts).with(/ActionController::Routing...\nfoo\n\n# == Route Map\n#\n# another good line\n# good line\n/)
+          it 'annotates with an empty line' do
+            expect(mock_file).to receive(:puts).with(expected_result)
+            expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
+
             AnnotateRoutes.do_annotations
           end
+        end
+      end
+
+      context 'When the route file ends with an empty line' do
+        let :route_file_content do
+          <<~EOS
+            ActionController::Routing...
+            foo
+          EOS
+        end
+
+        let :expected_result do
+          <<~EOS
+            ActionController::Routing...
+            foo
+
+            # == Route Map
+            #
+            # another good line
+            # good line
+          EOS
+        end
+
+        it 'annotates without an empty line' do
+          expect(mock_file).to receive(:puts).with(expected_result)
+          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
 
-    it 'should not add a newline if there are empty lines' do
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("ActionController::Routing...\nfoo\n")
-      expect(mock_file).to receive(:puts).with(/ActionController::Routing...\nfoo\n\n# == Route Map\n#\n# another good line\n# good line\n/)
           AnnotateRoutes.do_annotations
         end
+      end
+
+      context 'When option "timestamp" is passed' do
+        let :route_file_content do
+          <<~EOS.chomp
+            ActionController::Routing...
+            foo
+          EOS
+        end
+
+        let :expected_result do
+          /ActionController::Routing...\nfoo\n\n# == Route Map \(Updated \d{4}-\d{2}-\d{2} \d{2}:\d{2}\)\n#\n# another good line\n# good line\n/
+        end
+
+        it 'annotates with the timestamp and an empty line' do
+          expect(mock_file).to receive(:puts).with(expected_result)
+          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED)
 
-    it 'should add a timestamp when :timestamp is passed' do
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return("ActionController::Routing...\nfoo")
-      expect(mock_file).to receive(:puts).with(/ActionController::Routing...\nfoo\n\n# == Route Map \(Updated \d{4}-\d{2}-\d{2} \d{2}:\d{2}\)\n#\n# another good line\n# good line\n/)
           AnnotateRoutes.do_annotations timestamp: true
         end
       end
+    end
+  end
 
   describe '.remove_annotations' do
     before :each do