ReactIs.isValidElementType Unit Test extended with PureComponent case (#20033)

Co-authored-by: Adam Plocieniak <adam.plocieniak@allegro.pl>

Author: adasq

packages/react-is/src/__tests__/ReactIs-test.js

@@ -29,6 +29,8 @@ describe('ReactIs', () => {
     expect(ReactIs.typeOf({})).toBe(undefined);
     expect(ReactIs.typeOf(null)).toBe(undefined);
     expect(ReactIs.typeOf(undefined)).toBe(undefined);
+    expect(ReactIs.typeOf(NaN)).toBe(undefined);
+    expect(ReactIs.typeOf(Symbol('def'))).toBe(undefined);
   });
 
   it('identifies valid element types', () => {
@@ -37,6 +39,11 @@ describe('ReactIs', () => {
         return React.createElement('div');
       }
     }
+    class PureComponent extends React.PureComponent {
+      render() {
+        return React.createElement('div');
+      }
+    }
 
     const FunctionComponent = () => React.createElement('div');
     const ForwardRefComponent = React.forwardRef((props, ref) =>
@@ -48,6 +55,7 @@ describe('ReactIs', () => {
 
     expect(ReactIs.isValidElementType('div')).toEqual(true);
     expect(ReactIs.isValidElementType(Component)).toEqual(true);
+    expect(ReactIs.isValidElementType(PureComponent)).toEqual(true);
     expect(ReactIs.isValidElementType(FunctionComponent)).toEqual(true);
     expect(ReactIs.isValidElementType(ForwardRefComponent)).toEqual(true);
     expect(ReactIs.isValidElementType(LazyComponent)).toEqual(true);