Added test for map-with-reduce solution to explicitly verify handling of array entries.

Author: Julian Dreissig

exercises/implement_map_with_reduce/exercise.js

@@ -10,4 +10,9 @@ var numbers = Array.apply(null, {length: Math.random() * 20 + 1}).map(function()
   return randomInt(0, 9)
 })
 
-module.exports = runner(numbers, function(item) { return item * 3 })
+module.exports = runner.custom(function(map, numbers) {
+  var result = []
+  result.push('non-array entries', map(numbers, function(item) { return item * 3 }))
+  result.push('array entries', map(numbers, function(item) { return [item * 3] }))
+  return result
+})(numbers)