From 9f286058da779d74ed84365ea5aa769044aefc99 Mon Sep 17 00:00:00 2001
From: andre-matulionis-ifood <andre.matulionis@ifood.com.br>
Date: Fri, 8 Feb 2019 14:02:24 -0200
Subject: [PATCH 1/4] Returns unmount function on testHook

---
 src/index.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/index.js b/src/index.js
index 0f4c7d47..e6423873 100644
--- a/src/index.js
+++ b/src/index.js
@@ -67,7 +67,8 @@ function TestHook({callback}) {
 }
 
 function testHook(callback) {
-  render(<TestHook callback={callback} />)
+  const { unmount } = render(<TestHook callback={callback} />)
+  return unmount
 }
 
 function cleanup() {

From 53d2b3844f8fcd4c1332a58f44d5f5d97c58bf9c Mon Sep 17 00:00:00 2001
From: Andrewmat <andre.m.santos1@gmail.com>
Date: Fri, 8 Feb 2019 20:55:12 -0200
Subject: [PATCH 2/4] Adds test for unmount function; Adds example of useEffect

---
 examples/__tests__/react-hooks.js | 91 +++++++++++++++++++------------
 examples/react-hooks.js           | 15 ++++-
 src/__tests__/test-hook.js        | 16 +++++-
 src/index.js                      |  2 +-
 4 files changed, 85 insertions(+), 39 deletions(-)

diff --git a/examples/__tests__/react-hooks.js b/examples/__tests__/react-hooks.js
index 5e001a37..6e68735d 100644
--- a/examples/__tests__/react-hooks.js
+++ b/examples/__tests__/react-hooks.js
@@ -6,53 +6,76 @@
  */
 import {testHook, act, cleanup} from 'react-testing-library'
 
-import useCounter from '../react-hooks'
+import { useCounter, useDocumentTitle } from '../react-hooks'
 
 afterEach(cleanup)
 
-test('accepts default initial values', () => {
-  let count
-  testHook(() => ({count} = useCounter()))
+describe('useCounter', () => {
+  test('accepts default initial values', () => {
+    let count
+    testHook(() => ({count} = useCounter()))
 
-  expect(count).toBe(0)
-})
+    expect(count).toBe(0)
+  })
 
-test('accepts a default initial value for `count`', () => {
-  let count
-  testHook(() => ({count} = useCounter({})))
+  test('accepts a default initial value for `count`', () => {
+    let count
+    testHook(() => ({count} = useCounter({})))
 
-  expect(count).toBe(0)
-})
+    expect(count).toBe(0)
+  })
 
-test('provides an `increment` function', () => {
-  let count, increment
-  testHook(() => ({count, increment} = useCounter({step: 2})))
+  test('provides an `increment` function', () => {
+    let count, increment
+    testHook(() => ({count, increment} = useCounter({step: 2})))
 
-  expect(count).toBe(0)
-  act(() => {
-    increment()
+    expect(count).toBe(0)
+    act(() => {
+      increment()
+    })
+    expect(count).toBe(2)
   })
-  expect(count).toBe(2)
-})
 
-test('provides an `decrement` function', () => {
-  let count, decrement
-  testHook(() => ({count, decrement} = useCounter({step: 2})))
+  test('provides an `decrement` function', () => {
+    let count, decrement
+    testHook(() => ({count, decrement} = useCounter({step: 2})))
 
-  expect(count).toBe(0)
-  act(() => {
-    decrement()
+    expect(count).toBe(0)
+    act(() => {
+      decrement()
+    })
+    expect(count).toBe(-2)
   })
-  expect(count).toBe(-2)
-})
 
-test('accepts a default initial value for `step`', () => {
-  let count, increment
-  testHook(() => ({count, increment} = useCounter({})))
+  test('accepts a default initial value for `step`', () => {
+    let count, increment
+    testHook(() => ({count, increment} = useCounter({})))
 
-  expect(count).toBe(0)
-  act(() => {
-    increment()
+    expect(count).toBe(0)
+    act(() => {
+      increment()
+    })
+    expect(count).toBe(1)
   })
-  expect(count).toBe(1)
 })
+
+describe('useDocumentTitle', () => {
+  test('sets a title', () => {
+    document.title = 'original title'
+    testHook(() => {
+      useDocumentTitle('modified title')
+    })
+
+    expect(document.title).toBe('modified title')
+  })
+
+  test('returns to original title when component is unmounted', () => {
+    document.title = 'original title'
+    const { unmount } = testHook(() => {
+      useDocumentTitle('modified title')
+    })
+
+    unmount()
+    expect(document.title).toBe('original title')
+  })
+})
\ No newline at end of file
diff --git a/examples/react-hooks.js b/examples/react-hooks.js
index fad0de4c..141e8452 100644
--- a/examples/react-hooks.js
+++ b/examples/react-hooks.js
@@ -1,10 +1,19 @@
-import {useState} from 'react'
+import {useState, useEffect} from 'react'
 
-function useCounter({initialCount = 0, step = 1} = {}) {
+export function useCounter({initialCount = 0, step = 1} = {}) {
   const [count, setCount] = useState(initialCount)
   const increment = () => setCount(c => c + step)
   const decrement = () => setCount(c => c - step)
   return {count, increment, decrement}
 }
 
-export default useCounter
+export function useDocumentTitle(title) {
+  const [originalTitle, setOriginalTitle] = useState(document.title)
+  useEffect(() => {
+    setOriginalTitle(document.title)
+    document.title = title
+    return () => {
+      document.title = originalTitle
+    }
+  }, [title])
+}
diff --git a/src/__tests__/test-hook.js b/src/__tests__/test-hook.js
index f6bce9bd..301bee67 100644
--- a/src/__tests__/test-hook.js
+++ b/src/__tests__/test-hook.js
@@ -1,4 +1,4 @@
-import {useState} from 'react'
+import {useState, useEffect} from 'react'
 import 'jest-dom/extend-expect'
 import {testHook, cleanup} from '../'
 
@@ -12,3 +12,17 @@ test('testHook calls the callback', () => {
 test('confirm we can safely call a React Hook from within the callback', () => {
   testHook(() => useState())
 })
+test('returns a function to unmount the component', () => {
+  let isMounted
+  const { unmount } = testHook(() => {
+    useEffect(() => {
+      isMounted = true
+      return () => {
+        isMounted = false
+      }
+    })
+  })
+  expect(isMounted).toBe(true)
+  unmount()
+  expect(isMounted).toBe(false)
+})
diff --git a/src/index.js b/src/index.js
index e6423873..85d0827d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -68,7 +68,7 @@ function TestHook({callback}) {
 
 function testHook(callback) {
   const { unmount } = render(<TestHook callback={callback} />)
-  return unmount
+  return { unmount }
 }
 
 function cleanup() {

From 3d92dcc6a9689e12539c0f4498a0f081876b5410 Mon Sep 17 00:00:00 2001
From: Andrewmat <andre.m.santos1@gmail.com>
Date: Sat, 9 Feb 2019 21:19:57 -0200
Subject: [PATCH 3/4] Add Andrewmat as contributor

---
 .all-contributorsrc | 11 +++++++++++
 README.md           |  4 ++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/.all-contributorsrc b/.all-contributorsrc
index 9edfc26a..dea90e11 100644
--- a/.all-contributorsrc
+++ b/.all-contributorsrc
@@ -657,6 +657,17 @@
         "bug",
         "code"
       ]
+    },
+    {
+      "login": "Andrewmat",
+      "name": "André Matulionis dos Santos",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/5133846?v=4",
+      "profile": "https://twitter.com/Andrewmat",
+      "contributions": [
+        "code",
+        "example",
+        "test"
+      ]
     }
   ]
 }
diff --git a/README.md b/README.md
index 08cb5c43..49de2ab5 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ practices.</p>
 [![version][version-badge]][package] [![downloads][downloads-badge]][npmtrends]
 [![MIT License][license-badge]][license]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-67-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-68-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]
 [![Join the community on Spectrum][spectrum-badge]][spectrum]
 
@@ -216,7 +216,7 @@ Thanks goes to these people ([emoji key][emojis]):
 | [<img src="https://avatars3.githubusercontent.com/u/881986?v=4" width="100px;" alt="dadamssg"/><br /><sub><b>dadamssg</b></sub>](https://github.com/dadamssg)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=dadamssg "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/8734097?v=4" width="100px;" alt="Yazan Aabed"/><br /><sub><b>Yazan Aabed</b></sub>](https://www.yaabed.com/)<br />[📝](#blog-YazanAabeed "Blogposts") | [<img src="https://avatars0.githubusercontent.com/u/556258?v=4" width="100px;" alt="Tim"/><br /><sub><b>Tim</b></sub>](https://github.com/timbonicus)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Atimbonicus "Bug reports") [💻](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Documentation") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Tests") | [<img src="https://avatars3.githubusercontent.com/u/6682655?v=4" width="100px;" alt="Divyanshu Maithani"/><br /><sub><b>Divyanshu Maithani</b></sub>](http://divyanshu.xyz)<br />[✅](#tutorial-divyanshu013 "Tutorials") [📹](#video-divyanshu013 "Videos") | [<img src="https://avatars2.githubusercontent.com/u/9116042?v=4" width="100px;" alt="Deepak Grover"/><br /><sub><b>Deepak Grover</b></sub>](https://www.linkedin.com/in/metagrover)<br />[✅](#tutorial-metagrover "Tutorials") [📹](#video-metagrover "Videos") | [<img src="https://avatars0.githubusercontent.com/u/16276358?v=4" width="100px;" alt="Eyal Cohen"/><br /><sub><b>Eyal Cohen</b></sub>](https://github.com/eyalcohen4)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=eyalcohen4 "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/7452681?v=4" width="100px;" alt="Peter Makowski"/><br /><sub><b>Peter Makowski</b></sub>](https://github.com/petermakowski)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=petermakowski "Documentation") |
 | [<img src="https://avatars2.githubusercontent.com/u/20361668?v=4" width="100px;" alt="Michiel Nuyts"/><br /><sub><b>Michiel Nuyts</b></sub>](https://github.com/Michielnuyts)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=Michielnuyts "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/1195863?v=4" width="100px;" alt="Joe Ng'ethe"/><br /><sub><b>Joe Ng'ethe</b></sub>](https://github.com/joeynimu)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=joeynimu "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=joeynimu "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/19998290?v=4" width="100px;" alt="Kate"/><br /><sub><b>Kate</b></sub>](https://github.com/Enikol)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=Enikol "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/11980217?v=4" width="100px;" alt="Sean"/><br /><sub><b>Sean</b></sub>](http://www.seanrparker.com)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=SeanRParker "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/17031?v=4" width="100px;" alt="James Long"/><br /><sub><b>James Long</b></sub>](http://jlongster.com)<br />[🤔](#ideas-jlongster "Ideas, Planning, & Feedback") [📦](#platform-jlongster "Packaging/porting to new platform") | [<img src="https://avatars1.githubusercontent.com/u/10118777?v=4" width="100px;" alt="Herb Hagely"/><br /><sub><b>Herb Hagely</b></sub>](https://github.com/hhagely)<br />[💡](#example-hhagely "Examples") | [<img src="https://avatars2.githubusercontent.com/u/5779538?v=4" width="100px;" alt="Alex Wendte"/><br /><sub><b>Alex Wendte</b></sub>](http://www.wendtedesigns.com/)<br />[💡](#example-themostcolm "Examples") |
 | [<img src="https://avatars0.githubusercontent.com/u/6998954?v=4" width="100px;" alt="Monica Powell"/><br /><sub><b>Monica Powell</b></sub>](http://www.aboutmonica.com)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=M0nica "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/2699953?v=4" width="100px;" alt="Vitaly Sivkov"/><br /><sub><b>Vitaly Sivkov</b></sub>](http://sivkoff.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=sivkoff "Code") | [<img src="https://avatars3.githubusercontent.com/u/7049?v=4" width="100px;" alt="Weyert de Boer"/><br /><sub><b>Weyert de Boer</b></sub>](https://github.com/weyert)<br />[🤔](#ideas-weyert "Ideas, Planning, & Feedback") [👀](#review-weyert "Reviewed Pull Requests") | [<img src="https://avatars3.githubusercontent.com/u/13613037?v=4" width="100px;" alt="EstebanMarin"/><br /><sub><b>EstebanMarin</b></sub>](https://github.com/EstebanMarin)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=EstebanMarin "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/13953703?v=4" width="100px;" alt="Victor Martins"/><br /><sub><b>Victor Martins</b></sub>](https://github.com/vctormb)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=vctormb "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/19773?v=4" width="100px;" alt="Royston Shufflebotham"/><br /><sub><b>Royston Shufflebotham</b></sub>](https://github.com/RoystonS)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3ARoystonS "Bug reports") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=RoystonS "Documentation") [💡](#example-RoystonS "Examples") | [<img src="https://avatars0.githubusercontent.com/u/6834804?v=4" width="100px;" alt="chrbala"/><br /><sub><b>chrbala</b></sub>](https://github.com/chrbala)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=chrbala "Code") |
-| [<img src="https://avatars3.githubusercontent.com/u/887639?v=4" width="100px;" alt="Donavon West"/><br /><sub><b>Donavon West</b></sub>](http://donavon.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Documentation") [🤔](#ideas-donavon "Ideas, Planning, & Feedback") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Tests") | [<img src="https://avatars2.githubusercontent.com/u/689081?v=4" width="100px;" alt="Richard Maisano"/><br /><sub><b>Richard Maisano</b></sub>](https://github.com/maisano)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=maisano "Code") | [<img src="https://avatars0.githubusercontent.com/u/5244986?v=4" width="100px;" alt="Marco Biedermann"/><br /><sub><b>Marco Biedermann</b></sub>](https://www.marcobiedermann.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=marcobiedermann "Code") [🚧](#maintenance-marcobiedermann "Maintenance") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=marcobiedermann "Tests") | [<img src="https://avatars3.githubusercontent.com/u/93752?v=4" width="100px;" alt="Alex Zherdev"/><br /><sub><b>Alex Zherdev</b></sub>](https://github.com/alexzherdev)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Aalexzherdev "Bug reports") [💻](https://github.com/kentcdodds/react-testing-library/commits?author=alexzherdev "Code") |
+| [<img src="https://avatars3.githubusercontent.com/u/887639?v=4" width="100px;" alt="Donavon West"/><br /><sub><b>Donavon West</b></sub>](http://donavon.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Documentation") [🤔](#ideas-donavon "Ideas, Planning, & Feedback") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=donavon "Tests") | [<img src="https://avatars2.githubusercontent.com/u/689081?v=4" width="100px;" alt="Richard Maisano"/><br /><sub><b>Richard Maisano</b></sub>](https://github.com/maisano)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=maisano "Code") | [<img src="https://avatars0.githubusercontent.com/u/5244986?v=4" width="100px;" alt="Marco Biedermann"/><br /><sub><b>Marco Biedermann</b></sub>](https://www.marcobiedermann.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=marcobiedermann "Code") [🚧](#maintenance-marcobiedermann "Maintenance") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=marcobiedermann "Tests") | [<img src="https://avatars3.githubusercontent.com/u/93752?v=4" width="100px;" alt="Alex Zherdev"/><br /><sub><b>Alex Zherdev</b></sub>](https://github.com/alexzherdev)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Aalexzherdev "Bug reports") [💻](https://github.com/kentcdodds/react-testing-library/commits?author=alexzherdev "Code") | [<img src="https://avatars0.githubusercontent.com/u/5133846?v=4" width="100px;" alt="André Matulionis dos Santos"/><br /><sub><b>André Matulionis dos Santos</b></sub>](https://twitter.com/Andrewmat)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=Andrewmat "Code") [💡](#example-Andrewmat "Examples") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=Andrewmat "Tests") |
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 

From f99b41ad6f58b8911fd15ad5e4a145ad6fcac099 Mon Sep 17 00:00:00 2001
From: Andrewmat <andre.m.santos1@gmail.com>
Date: Sun, 10 Feb 2019 12:57:42 -0200
Subject: [PATCH 4/4] Adds rerender on testHook return

---
 .github/ISSUE_TEMPLATE.md                     |  3 +-
 .../__tests__/mock.react-transition-group.js  |  5 +--
 examples/__tests__/react-hooks.js             | 44 +++++++++++++++++--
 examples/react-hooks.js                       |  6 +++
 src/__tests__/test-hook.js                    | 16 ++++++-
 src/index.js                                  | 11 ++++-
 6 files changed, 74 insertions(+), 11 deletions(-)

diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 5114fdbd..724a7df6 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -59,7 +59,8 @@ What happened:
 
 <!-- Please provide the full error message/screenshots/anything -->
 
-Reproduction repository: https://github.com/alexkrolick/dom-testing-library-template
+Reproduction repository:
+https://github.com/alexkrolick/dom-testing-library-template
 
 <!--
 If possible, please create a repository that reproduces the issue with the
diff --git a/examples/__tests__/mock.react-transition-group.js b/examples/__tests__/mock.react-transition-group.js
index ef22636f..83894534 100644
--- a/examples/__tests__/mock.react-transition-group.js
+++ b/examples/__tests__/mock.react-transition-group.js
@@ -31,9 +31,8 @@ afterEach(cleanup)
 
 jest.mock('react-transition-group', () => {
   const FakeTransition = jest.fn(({children}) => children)
-  const FakeCSSTransition = jest.fn(
-    props =>
-      props.in ? <FakeTransition>{props.children}</FakeTransition> : null,
+  const FakeCSSTransition = jest.fn(props =>
+    props.in ? <FakeTransition>{props.children}</FakeTransition> : null,
   )
   return {CSSTransition: FakeCSSTransition, Transition: FakeTransition}
 })
diff --git a/examples/__tests__/react-hooks.js b/examples/__tests__/react-hooks.js
index 6e68735d..fe616eb7 100644
--- a/examples/__tests__/react-hooks.js
+++ b/examples/__tests__/react-hooks.js
@@ -6,7 +6,7 @@
  */
 import {testHook, act, cleanup} from 'react-testing-library'
 
-import { useCounter, useDocumentTitle } from '../react-hooks'
+import {useCounter, useDocumentTitle, useCall} from '../react-hooks'
 
 afterEach(cleanup)
 
@@ -59,6 +59,7 @@ describe('useCounter', () => {
   })
 })
 
+// using unmount function to check useEffect behavior when unmounting
 describe('useDocumentTitle', () => {
   test('sets a title', () => {
     document.title = 'original title'
@@ -71,11 +72,48 @@ describe('useDocumentTitle', () => {
 
   test('returns to original title when component is unmounted', () => {
     document.title = 'original title'
-    const { unmount } = testHook(() => {
+    const {unmount} = testHook(() => {
       useDocumentTitle('modified title')
     })
 
     unmount()
     expect(document.title).toBe('original title')
   })
-})
\ No newline at end of file
+})
+
+// using rerender function to test calling useEffect multiple times
+describe('useCall', () => {
+  test('calls once on render', () => {
+    const spy = jest.fn()
+    testHook(() => {
+      useCall(spy, [])
+    })
+    expect(spy).toHaveBeenCalledTimes(1)
+  })
+
+  test('calls again if deps change', () => {
+    let deps = [false]
+    const spy = jest.fn()
+    const {rerender} = testHook(() => {
+      useCall(spy, deps)
+    })
+    expect(spy).toHaveBeenCalledTimes(1)
+
+    deps = [true]
+    rerender()
+    expect(spy).toHaveBeenCalledTimes(2)
+  })
+
+  test('does not call again if deps are the same', () => {
+    let deps = [false]
+    const spy = jest.fn()
+    const {rerender} = testHook(() => {
+      useCall(spy, deps)
+    })
+    expect(spy).toHaveBeenCalledTimes(1)
+
+    deps = [false]
+    rerender()
+    expect(spy).toHaveBeenCalledTimes(1)
+  })
+})
diff --git a/examples/react-hooks.js b/examples/react-hooks.js
index 141e8452..251644cd 100644
--- a/examples/react-hooks.js
+++ b/examples/react-hooks.js
@@ -17,3 +17,9 @@ export function useDocumentTitle(title) {
     }
   }, [title])
 }
+
+export function useCall(callback, deps) {
+  useEffect(() => {
+    callback()
+  }, deps)
+}
diff --git a/src/__tests__/test-hook.js b/src/__tests__/test-hook.js
index 301bee67..673e9497 100644
--- a/src/__tests__/test-hook.js
+++ b/src/__tests__/test-hook.js
@@ -12,9 +12,9 @@ test('testHook calls the callback', () => {
 test('confirm we can safely call a React Hook from within the callback', () => {
   testHook(() => useState())
 })
-test('returns a function to unmount the component', () => {
+test('returns a function to unmount component', () => {
   let isMounted
-  const { unmount } = testHook(() => {
+  const {unmount} = testHook(() => {
     useEffect(() => {
       isMounted = true
       return () => {
@@ -26,3 +26,15 @@ test('returns a function to unmount the component', () => {
   unmount()
   expect(isMounted).toBe(false)
 })
+test('returns a function to rerender component', () => {
+  let renderCount = 0
+  const {rerender} = testHook(() => {
+    useEffect(() => {
+      renderCount++
+    })
+  })
+
+  expect(renderCount).toBe(1)
+  rerender()
+  expect(renderCount).toBe(2)
+})
diff --git a/src/index.js b/src/index.js
index 85d0827d..78b5ffae 100644
--- a/src/index.js
+++ b/src/index.js
@@ -67,8 +67,15 @@ function TestHook({callback}) {
 }
 
 function testHook(callback) {
-  const { unmount } = render(<TestHook callback={callback} />)
-  return { unmount }
+  const {unmount, rerender: rerenderComponent} = render(
+    <TestHook callback={callback} />,
+  )
+  return {
+    unmount,
+    rerender: () => {
+      rerenderComponent(<TestHook callback={callback} />)
+    },
+  }
 }
 
 function cleanup() {