Removed testHook from api

Author: ab18556

docs/react-testing-library/api.md

@@ -253,70 +253,4 @@ set up your framework.
 This is a light wrapper around the
 [`react-dom/test-utils` `act` function](https://reactjs.org/docs/test-utils.html#act).
 All it does is forward all arguments to the act function if your version of
-react supports `act`.
-
-## `testHook`
-
-`testHook` is a utility to test custom hooks. It is designed to help test
-reusable hooks in isolation.
-
-You should also write integration tests for components using custom hooks, and
-one-off hooks should be tested as part of the component instead.
-
-**Usage**
-
-```jsx
-import { testHook } from 'react-testing-libary'
-
-testHook(hook[, renderOptions])
-```
-
-**Arguments**
-
-- `hook` customHook to test
-- `renderOptions` options object to pass to the underlying `render`. See
-  [render options](#render-options). This is mostly useful for wrapping the hook
-  with a context provider.
-
-**Returns**
-
-```jsx
-const { rerender, unmount, result } = testHook(hook)
-```
-
-- `rerender` Call this function to render the wrapper again, i.e., to test that
-  the hook handles props changes
-- `unmount` Call this to unmount the component, i.e., to test side-effects and
-  cleanup behavior
-- `result` An object that acts like a React ref with a `current` property
-  pointing to the last value the hook returned. For example:
-  `expect(result.current.count).toBe(0)`
-
-**Example**
-
-```jsx
-// Example custom hook
-function useCounter({ initialCount = 0, step = 1 } = {}) {
-  const [count, setCount] = React.useState(initialCount)
-  const increment = () => setCount(c => c + step)
-  const decrement = () => setCount(c => c - step)
-  return { count, increment, decrement }
-}
-```
-
-```jsx
-// Test using the `result` ref
-test('returns result ref with latest result from hook execution', () => {
-  const { result } = testHook(useCounter)
-
-  expect(result.current.count).toBe(0)
-  act(() => result.current.increment())
-  expect(result.current.count).toBe(1)
-})
-```
-
-**More**
-
-- [More Examples](/docs/example-react-hooks)
-- [Tests](https://github.com/kentcdodds/react-testing-library/blob/master/src/__tests__/test-hook.js)
-- [Types](https://github.com/kentcdodds/react-testing-library/blob/master/typings/index.d.ts)
+react supports `act`.