diff --git a/lib/fasterer/file_traverser.rb b/lib/fasterer/file_traverser.rb
index eb2ede6..64bd879 100644
--- a/lib/fasterer/file_traverser.rb
+++ b/lib/fasterer/file_traverser.rb
@@ -80,14 +80,13 @@ def root_dir
     end
 
     def output(analyzer)
-      puts analyzer.file_path.colorize(:red)
-
       offenses_grouped_by_type(analyzer).each do |error_group_name, error_occurences|
-        puts "#{Fasterer::Offense::EXPLANATIONS[error_group_name]}."\
-             " Occurred at lines: #{error_occurences.map(&:line_number).join(', ')}."
+        error_occurences.map(&:line_number).each do |line|
+          print "#{analyzer.file_path}:#{line} #{Fasterer::Offense::EXPLANATIONS[error_group_name]}.\n"
+        end
       end
 
-      puts
+      print "\n"
     end
 
     def offenses_grouped_by_type(analyzer)
diff --git a/spec/lib/fasterer/file_traverser_spec.rb b/spec/lib/fasterer/file_traverser_spec.rb
index e8a4279..081e0a6 100644
--- a/spec/lib/fasterer/file_traverser_spec.rb
+++ b/spec/lib/fasterer/file_traverser_spec.rb
@@ -334,4 +334,24 @@
         .to match_array(['user.rb - RubyParser::SyntaxError - unterminated string meets end of file. near line 1: ""'])
     end
   end
+
+  describe 'output' do
+    let(:test_file_path) { RSpec.root.join('support', 'output', 'sample_code.rb') }
+    let(:analyzer) { Fasterer::Analyzer.new(test_file_path) }
+    let(:file_traverser) { Fasterer::FileTraverser.new('.') }
+
+    before do
+      analyzer.scan
+    end
+
+    context "when print offenses" do
+      let(:explanation) { Fasterer::Offense::EXPLANATIONS[:for_loop_vs_each] }
+
+      it 'should print offense' do
+        match = "#{test_file_path}:1 #{explanation}.\n\n"
+
+        expect { file_traverser.send(:output, analyzer) }.to output(match).to_stdout
+      end
+    end
+  end
 end
diff --git a/spec/support/output/sample_code.rb b/spec/support/output/sample_code.rb
new file mode 100644
index 0000000..92e5a45
--- /dev/null
+++ b/spec/support/output/sample_code.rb
@@ -0,0 +1,3 @@
+for number in [*1..100] do
+  number
+end
\ No newline at end of file