chore: add tests to check for single render

Author: mdjastrzebski

src/__tests__/renderHook.test.tsx

@@ -1,4 +1,5 @@
 import React, { ReactNode } from 'react';
+import TestRenderer from 'react-test-renderer';
 import { renderHook } from '../pure';
 
 test('gives comitted result', () => {
@@ -94,3 +95,20 @@ test('props type is inferred correctly when initial props is explicitly undefine
 
   expect(result.current).toBe(6);
 });
+
+/**
+ * This test makes sure that calling renderHook does
+ * not try to detect host component names in any form.
+ * But since there are numerous methods that could trigger that
+ * we check the count of renders using React Test Renderers.
+ */
+test('does render only once', () => {
+  jest.spyOn(TestRenderer, 'create');
+
+  renderHook(() => {
+    const [state, setState] = React.useState(1);
+    return [state, setState];
+  });
+
+  expect(TestRenderer.create).toHaveBeenCalledTimes(1);
+});