Simplify duplicate column test

Author: winton

lib/es5/index.js

@@ -882,7 +882,7 @@ var Parser = /*#__PURE__*/function (_Transform) {
           var obj = {}; // Transform record array to an object
 
           for (var i = 0, l = record.length; i < l; i++) {
-            if (columns[i] === undefined || columns[i].disabled) continue;
+            if (columns[i] === undefined || columns[i].disabled) continue; // Turn duplicate columns into an array
 
             if (obj[columns[i].name]) {
               if (Array.isArray(obj[columns[i].name])) {

test/option.columns.coffee

@@ -78,22 +78,14 @@ describe 'Option `columns`', ->
 
     it 'handle duplicate column names if true', (next) ->
       parse """
-      FIELD_1,FIELD_2,FIELD_3,FIELD_4,FIELD_5,FIELD_5
-      20322051544,1979,8.8017226E7,ABC,45,2000-01-01
-      28392898392,1974,8.8392926E7,DEF,23,2050-11-27
+      FIELD_1,FIELD_1
+      ABC,DEF
+      GHI,JKL
       """, columns: true, (err, data) ->
         data.should.eql [
-          'FIELD_1': '20322051544'
-          'FIELD_2': '1979'
-          'FIELD_3': '8.8017226E7'
-          'FIELD_4': 'ABC'
-          'FIELD_5': ['45', '2000-01-01']
+          'FIELD_1': ['ABC', 'DEF']
         ,
-          'FIELD_1': '28392898392'
-          'FIELD_2': '1974'
-          'FIELD_3':  '8.8392926E7'
-          'FIELD_4': 'DEF'
-          'FIELD_5': ['23', '2050-11-27']
+          'FIELD_1': ['GHI', 'JKL']
         ] unless err
         next err