feat: add UseMouseOut test

src/UseMouseOut.test.tsx

@@ -0,0 +1,28 @@
+import * as React from 'react';
+import { render, fireEvent } from 'react-testing-library';
+import UseMouseOut from './UseMouseOut';
+
+test('event should call props.fn when target match', (): void => {
+  const fn = jest.fn();
+
+  const { baseElement } = render(
+    <UseMouseOut fn={fn} target={(): HTMLElement => document.body} />
+  );
+
+  fireEvent.mouseOut(baseElement);
+  expect(fn).toBeCalledTimes(1);
+});
+
+test('event should NOT call props.fn when target mismatch', (): void => {
+  const fn = jest.fn();
+
+  const { getByTestId } = render(
+    <div>
+      <UseMouseOut fn={fn} target={(): HTMLElement => document.body} />
+      <div data-testid="div-element" />
+    </div>
+  );
+
+  fireEvent.mouseOut(getByTestId('div-element'));
+  expect(fn).toBeCalledTimes(0);
+});

src/UseMouseOut.tsx

@@ -14,7 +14,7 @@ export default class UseMouseOut extends React.Component<Props> {
 
     if (
       target &&
-      (target == evt.target || target === document || target === window)
+      (target === evt.target || target === document || target === window)
     ) {
       this.props.fn();
     }