[Enhancement] Group widget messages by date (#363)

* [Enhancement] Group widget messages by date

* Update DateSeparator snapshot

app/javascript/shared/helpers/DateHelper.js

@@ -0,0 +1,13 @@
+import moment from 'moment';
+
+class DateHelper {
+  constructor(date) {
+    this.date = moment(date * 1000);
+  }
+
+  format(dateFormat = 'MMM DD, YYYY') {
+    return this.date.format(dateFormat);
+  }
+}
+
+export default DateHelper;

app/javascript/shared/helpers/specs/DateHelper.sepc.js

@@ -0,0 +1,13 @@
+import DateSeparator from '../DateSeparator';
+
+describe('#DateSeparator', () => {
+  it('should format correctly without dateFormat', () => {
+    expect(new DateSeparator(1576340626).format()).toEqual('Dec 14, 2019');
+  });
+
+  it('should format correctly without dateFormat', () => {
+    expect(new DateSeparator(1576340626).format('DD-MM-YYYY')).toEqual(
+      '14-12-2019'
+    );
+  });
+});