modify: fix test and logic

browser/lib/date-formatter.js

@@ -1,36 +1,18 @@
 /**
  * @fileoverview Formatting date string.
  */
-
-/** @var {Array} */
-const monthMapings = [
-  'Jan.', 'Feb.', 'Mar.', 'Apr.', 'May', 'Jun.',
-  'Jul.', 'Aug.', 'Sep.', 'Oct.', 'Nov.', 'Dec.',
-];
+import moment from 'moment';
 
 /**
  * @description Return date string. For example, 'Sep.9, 2016 12:00'.
- * @param {Date}
+ * @param {mixed}
  * @return {string}
  */
 export function getLastUpdated(date) {
-  if (!(date instanceof Date)) {
-    throw Error('Invalid argument. Only instance of Date Object');
+  const m = moment(date)
+  if (!m.isValid()) {
+    throw Error('Invalid argument.');
   }
 
-  const year = date.getFullYear();
-  const month = monthMapings[date.getMonth()];
-  const day = date.getDate();
-  let hour = date.getHours();
-  let minute = date.getMinutes();
-
-  if (hour < 10) {
-    hour = `0${hour}`;
-  }
-
-  if (minute < 10) {
-    minute = `0${minute}`;
-  }
-
-  return `${month}${day}, ${year} ${hour}:${minute}`;
+  return m.format('MMM D, gggg H:mm')
 }

tests/date-formatter-test.js

@@ -4,42 +4,9 @@
 const test = require('ava')
 const { getLastUpdated } = require('browser/lib/date-formatter')
 
-/**
- * @description Get local Date insance.
- * @param {numbr} year
- * @param {number} month
- * @param {number} day
- * @param {number} hour
- * @param {number} minute
- * @param {number} second
- * @return {Date}
- */
-function generateLocalDate(year, month, day, hour, minute, second) {
-  const date = new Date()
-  date.setDate(day)
-  date.setFullYear(year)
-  date.setHours(hour)
-  date.setMinutes(minute)
-  date.setMonth(month - 1)
-  date.setSeconds(second)
-  return date
-}
-
-test(t => {
-  const testCases = [
-    [generateLocalDate(2016, 9, 9, 12, 0, 0), 'Sep.9, 2016 12:00'],
-    [generateLocalDate(2016, 9, 9, 2, 0, 0), 'Sep.9, 2016 02:00'],
-    [generateLocalDate(2016, 5, 9, 2, 1, 0), 'May9, 2016 02:01'],
-  ]
-
-  for (let testCase of testCases) {
-    t.is(testCase[1], getLastUpdated(testCase[0]))
-  }
-})
-
 test(t => {
   t.throws(
     () => getLastUpdated('invalid argument'),
-    'Invalid argument. Only instance of Date Object'
+    'Invalid argument.'
   )
 })