Add test case for full value replacement if the new value is the same as the last number of the previous value

src/number_format.js

@@ -641,18 +641,23 @@ class NumberFormat extends React.Component {
       return value.substr(0, selectionStart) + separator + value.substr(selectionStart + 1, value.length);
     }
 
-    /* don't do anyhting if something got added,
-     or if value is empty string (when whole input is cleared)
-     or whole input is replace with a number
-    */
+
     const leftBound = !!format ? 0 : prefix.length;
     const rightBound = lastValue.length - (!!format ? 0 : suffix.length);
+
     if (
-      value.length > lastValue.length
-      || !value.length ||
+      // don't do anything if something got added
+      value.length > lastValue.length ||
+      // or if the new value is an empty string 
+      !value.length ||
+      // or if nothing has changed, in which case start will be same as end
       start === end ||
+      // or in case if whole input is selected and new value is typed
       (selectionStart === 0 && selectionEnd === lastValue.length) ||
+      // or in case if the whole content is replaced by browser, example (autocomplete)
       (start === 0 && end === lastValue.length) ||
+      // or if charcters between prefix and suffix is selected. 
+      // For numeric inputs we apply the format so, prefix and suffix can be ignored
       (selectionStart === leftBound && selectionEnd === rightBound)
     ) {
       return value;

test/library/input.spec.js

@@ -236,6 +236,13 @@ describe('NumberFormat as input', () => {
     expect(wrapper.find('input').prop('value')).toEqual('+1 (012) 345 6 78 US');
   });
 
+  it('should replace the whole value if a new number is typed after selecting the everything', () => {
+    const wrapper = shallow(<NumberFormat prefix="$" value="10" allowedDecimalSeparators={[",", "."]} />);
+
+    simulateKeyInput(wrapper.find('input'), '0', 0, 3);
+
+    expect(wrapper.find('input').prop('value')).toEqual('$0')
+  })
   it('should allow replacing all characters with number when formatting is present', () => {
     const format = '+1 (###) ### # ## US';
     const wrapper = shallow(<NumberFormat format={format} value="+1 (123) 456 7 89 US" mask="_"/>);