diff --git a/.eslintrc.js b/.eslintrc.js
index f2f614a..23a8334 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,9 +1,15 @@
 module.exports = {
-  extends: ['airbnb-typescript'],
+  extends: [
+    'airbnb-typescript',
+    'plugin:jest/recommended'
+  ],
   parserOptions: {
-    project: `./tsconfig.json`
+    project: `./tsconfig.json`,
   },
   rules: {
-    '@typescript-eslint/semi': ['error', 'never']
-  }
+    '@typescript-eslint/semi': ['error', 'never'],
+    'jest/no-mocks-import': [0],
+    'max-len': [1, 110],
+    'react/jsx-filename-extension': [1, { extensions: ['.js', '.jsx'] }],
+  },
 }
diff --git a/package.json b/package.json
index 7fbe3f9..6f62039 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "eslint": "^7.19.0",
     "eslint-config-airbnb-typescript": "^12.0.0",
     "eslint-plugin-import": "^2.22.0",
+    "eslint-plugin-jest": "^24.1.3",
     "eslint-plugin-jsx-a11y": "^6.3.1",
     "eslint-plugin-react": "^7.20.3",
     "eslint-plugin-react-hooks": "^4.0.8",
diff --git a/src/__mocks__/AsyncStorage.js b/src/__mocks__/AsyncStorage.js
index 254b7ac..b03ded4 100644
--- a/src/__mocks__/AsyncStorage.js
+++ b/src/__mocks__/AsyncStorage.js
@@ -13,5 +13,10 @@ export default (init = {}, delay = 0) => {
     await pause(delay)
     cache[key] = val
   }
-  return { getItem, setItem, cache }
+  const clear = () => {
+    Object.keys(cache).forEach((key) => { cache[key] = undefined })
+  }
+  return {
+    getItem, setItem, cache, clear,
+  }
 }
diff --git a/src/fake.test.js b/src/fake.test.js
new file mode 100644
index 0000000..a9dc29a
--- /dev/null
+++ b/src/fake.test.js
@@ -0,0 +1,146 @@
+import React from 'react'
+import { act, renderHook } from '@testing-library/react-hooks'
+import { ApiProvider } from '.'
+import createStorage from './__mocks__/AsyncStorage'
+import {
+  useCalendar,
+  useChildList,
+  useClassmates,
+  useMenu,
+  useNews,
+  useNotifications,
+  useSchedule,
+  useUser,
+} from './hooks'
+
+const { default: init } = jest.requireActual('@skolplattformen/embedded-api')
+
+describe('hooks with fake data', () => {
+  let api
+  let storage
+  const wrapper = ({ children }) => (
+    <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
+  )
+  beforeEach(async () => {
+    api = init(() => { }, () => { })
+    await api.login('121212121212')
+
+    storage = createStorage({})
+  })
+  it('returns user', async () => {
+    await act(async () => {
+      const {
+        result,
+        waitForNextUpdate,
+      } = renderHook(() => useUser(), { wrapper })
+
+      await waitForNextUpdate()
+      await waitForNextUpdate()
+
+      expect(result.current.data).toEqual({
+        firstName: 'Namn',
+        lastName: 'Namnsson',
+      })
+    })
+  })
+  it('returns child list', async () => {
+    await act(async () => {
+      const {
+        result,
+        waitForNextUpdate,
+      } = renderHook(() => useChildList(), { wrapper })
+
+      await waitForNextUpdate()
+      await waitForNextUpdate()
+
+      expect(result.current.data).toHaveLength(2)
+    })
+  })
+  describe('data belonging to one child', () => {
+    let child
+    beforeAll(async () => {
+      [child] = await api.getChildren()
+    })
+    it('returns calendar', async () => {
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useCalendar(child), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        expect(result.current.data.length).toBeGreaterThan(1)
+      })
+    })
+    it('returns classmates', async () => {
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useClassmates(child), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        expect(result.current.data.length).toBeGreaterThan(1)
+      })
+    })
+    it('returns menu', async () => {
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useMenu(child), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        expect(result.current.data.length).toBeGreaterThan(1)
+      })
+    })
+    it('returns news', async () => {
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useNews(child), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        expect(result.current.data.length).toBeGreaterThan(1)
+      })
+    })
+    it('returns notifications', async () => {
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useNotifications(child), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        expect(result.current.data.length).toBeGreaterThan(1)
+      })
+    })
+    it('returns schedule', async () => {
+      const from = '2021-01-01'
+      const to = '2021-01-08'
+      await act(async () => {
+        const {
+          result,
+          waitForNextUpdate,
+        } = renderHook(() => useSchedule(child, from, to), { wrapper })
+
+        await waitForNextUpdate()
+        await waitForNextUpdate()
+
+        // No fake schedule in embedded-api yet
+        expect(result.current.data.length).not.toBeGreaterThan(1)
+      })
+    })
+  })
+})
diff --git a/src/useCalendar.test.js b/src/useCalendar.test.js
index a64deb3..bc8f198 100644
--- a/src/useCalendar.test.js
+++ b/src/useCalendar.test.js
@@ -6,26 +6,26 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useCalendar(child)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getCalendar.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      calendar_10: [{ id: 2 }]
+      calendar_10: [{ id: 2 }],
     }, 2)
     child = { id: 10 }
   })
@@ -69,7 +69,7 @@ describe('useCalendar(child)', () => {
       expect(result.current.status).toEqual('loaded')
     })
   })
-  it('calls cache', async () => {
+  it('retrieves data from cache', async () => {
     await act(async () => {
       api.isLoggedIn = true
       const { result, waitForNextUpdate } = renderHook(() => useCalendar(child), { wrapper })
@@ -80,6 +80,18 @@ describe('useCalendar(child)', () => {
       expect(result.current.data).toEqual([{ id: 2 }])
     })
   })
+  it('works when cache is empty', async () => {
+    storage.clear()
+    await act(async () => {
+      api.isLoggedIn = true
+      const { result, waitForNextUpdate } = renderHook(() => useCalendar(child), { wrapper })
+
+      await waitForNextUpdate()
+      await waitForNextUpdate()
+
+      expect(result.current.data).toEqual([{ id: 1 }])
+    })
+  })
   it('updates status to loading', async () => {
     await act(async () => {
       api.isLoggedIn = true
@@ -115,7 +127,7 @@ describe('useCalendar(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['calendar_10']).toEqual('[{"id":1}]')
+      expect(storage.cache.calendar_10).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -130,7 +142,7 @@ describe('useCalendar(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['calendar_10']).toEqual('[{"id":2}]')
+      expect(storage.cache.calendar_10).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useChildlist.test.js b/src/useChildlist.test.js
index 87c3be2..96a0f0c 100644
--- a/src/useChildlist.test.js
+++ b/src/useChildlist.test.js
@@ -6,25 +6,25 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useChildList()', () => {
   let api
   let storage
-  let result
+  let response
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getChildren.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      children: [{ id: 2 }]
+      children: [{ id: 2 }],
     }, 2)
   })
   afterEach(async () => {
@@ -113,7 +113,7 @@ describe('useChildList()', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['children']).toEqual('[{"id":1}]')
+      expect(storage.cache.children).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -128,7 +128,7 @@ describe('useChildList()', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['children']).toEqual('[{"id":2}]')
+      expect(storage.cache.children).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useClassmates.test.js b/src/useClassmates.test.js
index abb4a69..6e116d7 100644
--- a/src/useClassmates.test.js
+++ b/src/useClassmates.test.js
@@ -6,26 +6,26 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useClassmates(child)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getClassmates.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      classmates_10: [{ id: 2 }]
+      classmates_10: [{ id: 2 }],
     }, 2)
     child = { id: 10 }
   })
@@ -115,7 +115,7 @@ describe('useClassmates(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['classmates_10']).toEqual('[{"id":1}]')
+      expect(storage.cache.classmates_10).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -130,7 +130,7 @@ describe('useClassmates(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['classmates_10']).toEqual('[{"id":2}]')
+      expect(storage.cache.classmates_10).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useMenu.test.js b/src/useMenu.test.js
index ba53bcd..9be2217 100644
--- a/src/useMenu.test.js
+++ b/src/useMenu.test.js
@@ -6,26 +6,26 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useMenu(child)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getMenu.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      menu_10: [{ id: 2 }]
+      menu_10: [{ id: 2 }],
     }, 2)
     child = { id: 10 }
   })
@@ -115,7 +115,7 @@ describe('useMenu(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['menu_10']).toEqual('[{"id":1}]')
+      expect(storage.cache.menu_10).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -130,7 +130,7 @@ describe('useMenu(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['menu_10']).toEqual('[{"id":2}]')
+      expect(storage.cache.menu_10).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useNews.test.js b/src/useNews.test.js
index 61ae9ef..e395386 100644
--- a/src/useNews.test.js
+++ b/src/useNews.test.js
@@ -6,26 +6,26 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useNews(child)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getNews.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      news_10: [{ id: 2 }]
+      news_10: [{ id: 2 }],
     }, 2)
     child = { id: 10 }
   })
@@ -115,7 +115,7 @@ describe('useNews(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['news_10']).toEqual('[{"id":1}]')
+      expect(storage.cache.news_10).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -130,7 +130,7 @@ describe('useNews(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['news_10']).toEqual('[{"id":2}]')
+      expect(storage.cache.news_10).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useNotifications.test.js b/src/useNotifications.test.js
index 92f0523..ca37b45 100644
--- a/src/useNotifications.test.js
+++ b/src/useNotifications.test.js
@@ -6,26 +6,26 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useNotifications(child)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getNotifications.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      notifications_10: [{ id: 2 }]
+      notifications_10: [{ id: 2 }],
     }, 2)
     child = { id: 10 }
   })
@@ -115,7 +115,7 @@ describe('useNotifications(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['notifications_10']).toEqual('[{"id":1}]')
+      expect(storage.cache.notifications_10).toEqual('[{"id":1}]')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -130,7 +130,7 @@ describe('useNotifications(child)', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['notifications_10']).toEqual('[{"id":2}]')
+      expect(storage.cache.notifications_10).toEqual('[{"id":2}]')
     })
   })
 })
diff --git a/src/useSchedule.test.js b/src/useSchedule.test.js
index 835a953..e275638 100644
--- a/src/useSchedule.test.js
+++ b/src/useSchedule.test.js
@@ -6,12 +6,12 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useSchedule(child, from, to)', () => {
   let api
   let storage
-  let result
+  let response
   let child
   let from
   let to
@@ -19,15 +19,15 @@ describe('useSchedule(child, from, to)', () => {
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = [{ id: 1 }]
+    response = [{ id: 1 }]
     api = init()
     api.getSchedule.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      'schedule_10_2021-01-01_2021-01-08': [{ id: 2 }]
+      'schedule_10_2021-01-01_2021-01-08': [{ id: 2 }],
     }, 2)
     child = { id: 10 }
     from = '2021-01-01'
diff --git a/src/useUser.test.js b/src/useUser.test.js
index be644e7..3758897 100644
--- a/src/useUser.test.js
+++ b/src/useUser.test.js
@@ -6,25 +6,25 @@ import store from './store'
 import init from './__mocks__/@skolplattformen/embedded-api'
 import createStorage from './__mocks__/AsyncStorage'
 
-const pause = (ms = 0) => new Promise(r => setTimeout(r, ms))
+const pause = (ms = 0) => new Promise((r) => setTimeout(r, ms))
 
 describe('useUser()', () => {
   let api
   let storage
-  let result
+  let response
   const wrapper = ({ children }) => (
     <ApiProvider api={api} storage={storage}>{children}</ApiProvider>
   )
   beforeEach(() => {
-    result = { id: 1 }
+    response = { id: 1 }
     api = init()
     api.getUser.mockImplementation(() => (
       new Promise((res) => {
-        setTimeout(() => res(result), 50)
+        setTimeout(() => res(response), 50)
       })
     ))
     storage = createStorage({
-      user: { id: 2 }
+      user: { id: 2 },
     }, 2)
   })
   afterEach(async () => {
@@ -113,7 +113,7 @@ describe('useUser()', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['user']).toEqual('{"id":1}')
+      expect(storage.cache.user).toEqual('{"id":1}')
     })
   })
   it('does not store in cache if fake', async () => {
@@ -128,7 +128,7 @@ describe('useUser()', () => {
       await waitForNextUpdate()
       await pause(20)
 
-      expect(storage.cache['user']).toEqual('{"id":2}')
+      expect(storage.cache.user).toEqual('{"id":2}')
     })
   })
 })
diff --git a/yarn.lock b/yarn.lock
index 805750b..cec830c 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1400,7 +1400,7 @@
     semver "^7.3.2"
     tsutils "^3.17.1"
 
-"@typescript-eslint/experimental-utils@4.14.2":
+"@typescript-eslint/experimental-utils@4.14.2", "@typescript-eslint/experimental-utils@^4.0.1":
   version "4.14.2"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/experimental-utils/-/experimental-utils-4.14.2.tgz#9df35049d1d36b6cbaba534d703648b9e1f05cbb"
   integrity sha512-mV9pmET4C2y2WlyHmD+Iun8SAEqkLahHGBkGqDVslHkmoj3VnxnGP4ANlwuxxfq1BsKdl/MPieDbohCEQgKrwA==
@@ -2540,6 +2540,13 @@ eslint-plugin-import@^2.22.0:
     resolve "^1.17.0"
     tsconfig-paths "^3.9.0"
 
+eslint-plugin-jest@^24.1.3:
+  version "24.1.3"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-jest/-/eslint-plugin-jest-24.1.3.tgz#fa3db864f06c5623ff43485ca6c0e8fc5fe8ba0c"
+  integrity sha512-dNGGjzuEzCE3d5EPZQ/QGtmlMotqnYWD/QpCZ1UuZlrMAdhG5rldh0N0haCvhGnUkSeuORS5VNROwF9Hrgn3Lg==
+  dependencies:
+    "@typescript-eslint/experimental-utils" "^4.0.1"
+
 eslint-plugin-jsx-a11y@^6.3.1:
   version "6.4.1"
   resolved "https://registry.yarnpkg.com/eslint-plugin-jsx-a11y/-/eslint-plugin-jsx-a11y-6.4.1.tgz#a2d84caa49756942f42f1ffab9002436391718fd"