Improves coverage of the componentWillReceiveProps

Author: Ricardo Machado

components/calendar/calendar.js

@@ -23,7 +23,9 @@ const {
 function processProps(props) {
   const { initialDates, maxDate, minDate, selectionType } = props;
   const maxLimit = maxDate ? normalizeDate(new Date(maxDate), 23, 59, 59, 999) : null;
-  const renderDate = normalizeDate(((initialDates && initialDates.length) ? new Date(initialDates[0]) : new Date()));
+  const renderDate = normalizeDate(((initialDates && initialDates.length && initialDates[0])
+    ? new Date(initialDates[0])
+    : new Date()));
 
   let minLimit = minDate ? normalizeDate(new Date(minDate)) : null;
   let selectedDates = [null, null];
@@ -78,7 +80,25 @@ export default class Calendar extends Component {
   }
 
   componentWillReceiveProps(newProps) {
-    this.setState(() => processProps(newProps));
+    const { initialDates, maxDate, minDate, selectionType } = newProps;
+
+    let propsChanged = (
+      (maxDate !== this.props.maxDate) ||
+      (minDate !== this.props.minDate) ||
+      (selectionType !== this.props.selectionType)
+    );
+
+    if (initialDates) {
+      if (this.props.initialDates) {
+        propsChanged = propsChanged || initialDates.some((item, idx) => item !== this.props.initialDates[idx]);
+      } else {
+        propsChanged = true;
+      }
+    }
+
+    if (propsChanged) {
+      this.setState(() => processProps(newProps));
+    }
   }
 
   /**