fixed #243, filesnames and lines can be ambigous with shared example …

…groups, so make them uniq

lib/guard/rspec/formatter.rb

@@ -45,7 +45,7 @@ def write(&block)
 
       def _failed_paths
         failed = examples.select { |e| e.execution_result[:status] == 'failed' }
-        failed.map { |e| self.class.extract_spec_location(e.metadata) }
+        failed.map { |e| self.class.extract_spec_location(e.metadata) }.sort.uniq
       end
 
       def _message(example_count, failure_count, pending_count, duration)

spec/lib/guard/rspec/formatter_spec.rb

@@ -38,6 +38,12 @@
         expect(result).to match /^3 examples, 1 failures in 123\.0 seconds\n#{spec_filename}\n$/
       end
 
+      it 'writes only uniq filenames out' do
+        allow(formatter).to receive(:examples) { [failed_example, failed_example] }
+        formatter.dump_summary(123, 3, 1, 0)
+        expect(result).to match /^3 examples, 1 failures in 123\.0 seconds\n#{spec_filename}\n$/
+      end
+
     end
 
     it "should find the spec file for shared examples" do