added spec for syntax error

spec/pronto/rubocop_spec.rb

@@ -18,6 +18,46 @@ module Pronto
       end
     end
 
+    describe '#inspect' do
+      subject { rubocop.inspect(patches) }
+
+      let(:item_patch){ nil }
+      let(:item_line) { double(new_lineno: 1) }
+      let(:item_offense) { double(disabled?: false, cop_name: "Syntax", message: "message-text", status: :uncorrected, line: 9) }
+      let(:item_line_patch) { nil }
+      let(:item_delta_value) { nil }
+      let(:item_severity) { double(name: :error)}
+
+      before do
+        allow(rubocop).to receive(:patch   ).and_return(patch)
+        allow(rubocop).to receive(:offences).and_return(array_of_offences)
+        allow(rubocop).to receive(:patches ).and_return(patch)
+
+        allow(item_patch).to receive(:added_lines).and_return(array_of_lines)
+
+        allow(item_line).to receive(:patch).and_return(line_patch)
+        allow(item_line).to receive(:commit_sha).and_return("123456789abcdefgh")
+        allow(line_patch).to receive(:delta).and_return(delta_value)
+        allow(item_delta_value).to receive(:new_file).and_return(file)
+        allow(item_offense).to receive(:severity).and_return(severity)
+        allow(item_severity).to receive(:name).and_return(:error)
+      end
+
+      context 'return offences' do
+        let(:patch) { item_patch }
+        let(:line_patch) { item_line_patch }
+        let(:delta_value) { item_delta_value }
+        let(:array_of_offences) { [ item_offense ] }
+        let(:array_of_lines) { [ item_line ] }
+        let(:file) { {:path => "file.rb"} }
+        let(:severity) { item_severity }
+
+        it 'syntax error offense' do
+          should == [[],Message.new("file.rb", patch.added_lines.last, :error, "message-text", nil, nil)]
+        end # it
+      end # context
+    end # describe
+
     describe '#level' do
       subject { rubocop.level(severity) }