refactor jest config, add more tests

README.md

@@ -2,7 +2,7 @@
   <a href="https://kremalicious.com"><img src="src/images/github-header.png" /></a>
  </p>
 <p align="center">
-  <strong>🍭 My blog built with <a href="http://gatsbyjs.org">Gatsby</a>. Neat.</strong>
+  <strong>🍭 My blog built with <a href="http://gatsbyjs.org">Gatsby</a> + TypeScript. Neat.</strong>
 </p>
 <p align="center">
   <a href="https://kremalicious.com">kremalicious.com</a>

jest.config.js

@@ -3,12 +3,12 @@ module.exports = {
     '^.+\\.(tsx?|jsx?)$': 'ts-jest',
     '^.+\\.jsx?$': '<rootDir>/jest/jest-preprocess.js'
   },
-  testRegex: '(/__tests__/.*|\\.(test|spec))\\.(ts|tsx)$',
+  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.([tj]sx?)$',
   moduleNameMapper: {
     '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
     '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
-      '<rootDir>/jest/__mocks__/file-mock.ts',
+      '<rootDir>/jest/__mocks__/file-mock.js',
-    '\\.svg': '<rootDir>/jest/__mocks__/svgr-mock.ts'
+    '\\.svg': '<rootDir>/jest/__mocks__/svgr-mock.js'
   },
   moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
   testPathIgnorePatterns: ['node_modules', '.cache', 'public', 'coverage'],
@@ -16,7 +16,6 @@ module.exports = {
   globals: {
     __PATH_PREFIX__: ''
   },
-  testURL: 'http://localhost',
   setupFiles: ['<rootDir>/jest/loadershim.js'],
   setupFilesAfterEnv: ['<rootDir>/jest/setup-test-env.ts'],
   collectCoverageFrom: ['src/**/*.{ts,tsx}', '!src/@types/**/*']

jest/__fixtures__/avatar.json

@@ -1,4 +1,5 @@
 {
+  "avatar": {
     "edges": [
       {
         "node": {
@@ -18,3 +19,4 @@
       }
     ]
   }
+}

jest/__fixtures__/meta.json

@@ -0,0 +1,39 @@
+{
+  "site": {
+    "siteMetadata": {
+      "siteTitle": "kremalicious",
+      "siteTitleShort": "krlc",
+      "siteDescription": "Blog of designer & developer Matthias Kretschmann",
+      "siteUrl": "https://kremalicious.com",
+      "author": {
+        "name": "Matthias Kretschmann",
+        "email": "m@kretschmann.io",
+        "uri": "https://matthiaskretschmann.com",
+        "twitter": "https://twitter.com/kremalicious",
+        "github": "https://github.com/kremalicious",
+        "facebook": "https://facebook.com/matthiaskretschmann",
+        "bitcoin": "171qDmKEXm9YBgBLXyGjjPvopP5o9htQ1V",
+        "ether": "0x339dbC44d39bf1961E385ed0Ae88FC6069b87Ea1"
+      },
+      "typekitID": "msu4qap",
+      "menu": [
+        {
+          "title": "Photos",
+          "link": "/photos"
+        },
+        {
+          "title": "Goodies",
+          "link": "/tags/goodies"
+        },
+        {
+          "title": "Tags",
+          "link": "/tags"
+        }
+      ],
+      "rss": "/feed.xml",
+      "jsonfeed": "/feed.json",
+      "itemsPerPage": 20,
+      "repoContentPath": "https://github.com/kremalicious/blog/tree/master/content"
+    }
+  }
+}

jest/__fixtures__/photos.json

@@ -0,0 +1,62 @@
+{
+  "photos": {
+    "edges": [
+      {
+        "node": {
+          "id": "6effe45d-0884-527c-9fba-6f7f567979fd",
+          "frontmatter": {
+            "title": "Országház II",
+            "type": "photo",
+            "image": {
+              "childImageSharp": {
+                "fluid": {
+                  "aspectRatio": 1,
+                  "src": "/static/2dbcf257b4bdf625c24fede935d32425/2423a/2019-11-03-orszaghaz-ii.jpg",
+                  "srcSet": "/static/2dbcf257b4bdf625c24fede935d32425/b7835/2019-11-03-orszaghaz-ii.jpg 100w,\n/static/2dbcf257b4bdf625c24fede935d32425/2de44/2019-11-03-orszaghaz-ii.jpg 200w,\n/static/2dbcf257b4bdf625c24fede935d32425/2423a/2019-11-03-orszaghaz-ii.jpg 400w,\n/static/2dbcf257b4bdf625c24fede935d32425/66039/2019-11-03-orszaghaz-ii.jpg 600w,\n/static/2dbcf257b4bdf625c24fede935d32425/ba820/2019-11-03-orszaghaz-ii.jpg 800w,\n/static/2dbcf257b4bdf625c24fede935d32425/d04d5/2019-11-03-orszaghaz-ii.jpg 3793w",
+                  "srcWebp": "/static/2dbcf257b4bdf625c24fede935d32425/33771/2019-11-03-orszaghaz-ii.webp",
+                  "srcSetWebp": "/static/2dbcf257b4bdf625c24fede935d32425/4f5da/2019-11-03-orszaghaz-ii.webp 100w,\n/static/2dbcf257b4bdf625c24fede935d32425/72345/2019-11-03-orszaghaz-ii.webp 200w,\n/static/2dbcf257b4bdf625c24fede935d32425/33771/2019-11-03-orszaghaz-ii.webp 400w,\n/static/2dbcf257b4bdf625c24fede935d32425/f12d8/2019-11-03-orszaghaz-ii.webp 600w,\n/static/2dbcf257b4bdf625c24fede935d32425/b975c/2019-11-03-orszaghaz-ii.webp 800w,\n/static/2dbcf257b4bdf625c24fede935d32425/f7332/2019-11-03-orszaghaz-ii.webp 3793w",
+                  "sizes": "(max-width: 400px) 100vw, 400px",
+                  "originalImg": "/static/2dbcf257b4bdf625c24fede935d32425/d04d5/2019-11-03-orszaghaz-ii.jpg",
+                  "originalName": "2019-11-03-orszaghaz-ii.jpg",
+                  "presentationWidth": 400,
+                  "presentationHeight": 300
+                }
+              }
+            }
+          },
+          "fields": {
+            "slug": "/orszaghaz-ii/"
+          }
+        }
+      },
+      {
+        "node": {
+          "id": "c80697e5-681d-5fcc-9dab-c3a3821ff0b1",
+          "frontmatter": {
+            "title": "Országház I",
+            "type": "photo",
+            "image": {
+              "childImageSharp": {
+                "fluid": {
+                  "aspectRatio": 1,
+                  "src": "/static/36d87329aeeda296ae923606e5a4a785/2423a/2019-11-02-orszaghaz-i.jpg",
+                  "srcSet": "/static/36d87329aeeda296ae923606e5a4a785/b7835/2019-11-02-orszaghaz-i.jpg 100w,\n/static/36d87329aeeda296ae923606e5a4a785/2de44/2019-11-02-orszaghaz-i.jpg 200w,\n/static/36d87329aeeda296ae923606e5a4a785/2423a/2019-11-02-orszaghaz-i.jpg 400w,\n/static/36d87329aeeda296ae923606e5a4a785/66039/2019-11-02-orszaghaz-i.jpg 600w,\n/static/36d87329aeeda296ae923606e5a4a785/ba820/2019-11-02-orszaghaz-i.jpg 800w,\n/static/36d87329aeeda296ae923606e5a4a785/c9c86/2019-11-02-orszaghaz-i.jpg 3708w",
+                  "srcWebp": "/static/36d87329aeeda296ae923606e5a4a785/33771/2019-11-02-orszaghaz-i.webp",
+                  "srcSetWebp": "/static/36d87329aeeda296ae923606e5a4a785/4f5da/2019-11-02-orszaghaz-i.webp 100w,\n/static/36d87329aeeda296ae923606e5a4a785/72345/2019-11-02-orszaghaz-i.webp 200w,\n/static/36d87329aeeda296ae923606e5a4a785/33771/2019-11-02-orszaghaz-i.webp 400w,\n/static/36d87329aeeda296ae923606e5a4a785/f12d8/2019-11-02-orszaghaz-i.webp 600w,\n/static/36d87329aeeda296ae923606e5a4a785/b975c/2019-11-02-orszaghaz-i.webp 800w,\n/static/36d87329aeeda296ae923606e5a4a785/262c1/2019-11-02-orszaghaz-i.webp 3708w",
+                  "sizes": "(max-width: 400px) 100vw, 400px",
+                  "originalImg": "/static/36d87329aeeda296ae923606e5a4a785/c9c86/2019-11-02-orszaghaz-i.jpg",
+                  "originalName": "2019-11-02-orszaghaz-i.jpg",
+                  "presentationWidth": 400,
+                  "presentationHeight": 297
+                }
+              }
+            }
+          },
+          "fields": {
+            "slug": "/orszaghaz-i/"
+          }
+        }
+      }
+    ]
+  }
+}

jest/__mocks__/file-mock.js

@@ -0,0 +1 @@
+module.exports = 'test-file-stub'

jest/__mocks__/file-mock.ts

@@ -1 +0,0 @@
-export default 'test-file-stub'

jest/__mocks__/gatsby.js

@@ -0,0 +1,29 @@
+/* eslint-disable no-unused-vars */
+
+const React = require('react')
+const gatsby = jest.requireActual('gatsby')
+
+module.exports = {
+  ...gatsby,
+  graphql: jest.fn(),
+  Link: jest.fn().mockImplementation(
+    // these props are invalid for an `a` tag
+    ({
+      activeClassName,
+      activeStyle,
+      getProps,
+      innerRef,
+      partiallyActive,
+      ref,
+      replace,
+      to,
+      ...rest
+    }) =>
+      React.createElement('a', {
+        ...rest,
+        href: to
+      })
+  ),
+  StaticQuery: jest.fn(),
+  useStaticQuery: jest.fn()
+}

jest/__mocks__/gatsby.ts

@@ -1,14 +0,0 @@
-import React from 'react'
-const gatsby = jest.requireActual('gatsby')
-
-export default {
-  ...gatsby,
-  graphql: jest.fn(),
-  Link: jest
-    .fn()
-    .mockImplementation(({ to, ...rest }) =>
-      React.createElement('a', { ...rest, href: to })
-    ),
-  StaticQuery: jest.fn(),
-  useStaticQuery: jest.fn()
-}

jest/__mocks__/svgr-mock.js

@@ -0,0 +1,6 @@
+import React from 'react'
+
+export default 'SvgrURL'
+const SvgrMock = React.forwardRef((props, ref) => <span ref={ref} {...props} />)
+
+export const ReactComponent = SvgrMock

jest/__mocks__/svgr-mock.ts

@@ -1,3 +0,0 @@
-const content = 'svg'
-export const ReactComponent = content
-export default content

jest/setup-test-env.ts

@@ -1 +1,18 @@
 import '@testing-library/jest-dom/extend-expect'
+
+import * as Gatsby from 'gatsby'
+const useStaticQuery = jest.spyOn(Gatsby, 'useStaticQuery')
+import meta from '../jest/__fixtures__/meta.json'
+import avatar from '../jest/__fixtures__/avatar.json'
+import posts from '../jest/__fixtures__/posts.json'
+import github from '../jest/__fixtures__/github.json'
+
+beforeAll(() => {
+  useStaticQuery.mockImplementation(() => ({
+    ...meta,
+    ...avatar,
+    logo: { edges: [{ node: { relativePath: 'apple-touch-icon.png' } }] },
+    ...posts,
+    ...github
+  }))
+})

package.json

@@ -10,7 +10,7 @@
     "start": "gatsby develop --host 0.0.0.0",
     "build": "gatsby build && npm run copy",
     "ssr": "npm run build && serve -s public/",
-    "test": "npm run lint && jest --coverage",
+    "test": "npm run lint && jest --coverage --silent",
     "test:watch": "npm run lint && jest --coverage --watch",
     "copy": "cp -R content/media/ public",
     "lint": "run-p --continue-on-error lint:js lint:css lint:md",

src/@types/Image.d.ts

@@ -4,7 +4,7 @@ export interface ImageProps {
   title?: string
   fluid?: FluidObject
   fixed?: FixedObject
-  alt: string
+  alt?: string
   original?: { src: string }
 }
 

src/components/Layout.test.tsx

@@ -0,0 +1,7 @@
+import React from 'react'
+import testRender from '../../jest/testRender'
+import Layout from './Layout'
+
+describe('Layout', () => {
+  testRender(<Layout>Hello</Layout>)
+})

src/components/atoms/Changelog.test.tsx

@@ -1,23 +1,17 @@
 import React from 'react'
-import testRender from '../../../jest/testRender'
+import { render } from '@testing-library/react'
 
-import { PureChangelog as Changelog } from './Changelog'
+import Changelog from './Changelog'
-import { GitHubRepo } from '../../@types/GitHub'
-
-const repos: [{ node: GitHubRepo }] = [
-  {
-    node: {
-      name: 'gatsby-plugin-matomo',
-      url: 'https://hello.com',
-      owner: { login: 'kremalicious' },
-      object: {
-        id: 'hello',
-        text: 'hello'
-      }
-    }
-  }
-]
 
 describe('Changelog', () => {
-  testRender(<Changelog repo="gatsby-plugin-matomo" repos={repos} />)
+  it('renders without crashing', () => {
+    const { container, rerender } = render(
+      <Changelog repo="gatsby-plugin-matomo" />
+    )
+    expect(container.firstChild).toBeInTheDocument()
+
+    // return nothing when no match
+    rerender(<Changelog repo="nomatch" />)
+    expect(container.firstChild).not.toBeInTheDocument()
+  })
 })

src/components/atoms/Changelog.tsx

@@ -22,7 +22,6 @@ export function PureChangelog({
   if (!repoMatch) return null
 
   const { object, url, owner } = repoMatch
-  if (!object) return null
 
   const changelogHtml =
     object &&
@@ -53,7 +52,6 @@ export function PureChangelog({
   )
 }
 
-export default function Changelog({ repo }: { repo: string }) {
 const queryGithub = graphql`
   query GitHubReposInfo {
     github {
@@ -79,6 +77,8 @@ export default function Changelog({ repo }: { repo: string }) {
     }
   }
 `
+
+export default function Changelog({ repo }: { repo: string }) {
   const data: GitHub = useStaticQuery(queryGithub)
   const repos: [{ node: GitHubRepo }] = data.github.viewer.repositories.edges
   return <PureChangelog repo={repo} repos={repos} />

src/components/atoms/Container.test.tsx

@@ -1,9 +0,0 @@
-import React from 'react'
-// import { render } from '@testing-library/react'
-import testRender from '../../../jest/testRender'
-
-import Container from './Container'
-
-describe('Container', () => {
-  testRender(<Container>Hello</Container>)
-})

src/components/atoms/Copy.tsx

@@ -14,7 +14,7 @@ export default function Copy({ text }: { text: string }) {
     <Clipboard
       data-clipboard-text={text}
       button-title="Copy to clipboard"
-      onSuccess={e => onCopySuccess(e)}
+      onSuccess={(e: ClipboardJS.Event) => onCopySuccess(e)}
       className={styles.button}
     >
       <Icon name="Copy" />

src/components/atoms/Hamburger.test.tsx

@@ -1,9 +0,0 @@
-import React from 'react'
-// import { render } from '@testing-library/react'
-import testRender from '../../../jest/testRender'
-
-import Hamburger from './Hamburger'
-
-describe('Hamburger', () => {
-  testRender(<Hamburger onClick={() => null} />)
-})

src/components/atoms/Time.test.tsx

@@ -1,16 +0,0 @@
-import React, { Suspense } from 'react'
-import { render, waitForElement } from '@testing-library/react'
-
-import Time from './Time'
-
-describe('Time', () => {
-  test('renders lazy', async () => {
-    const { getByText } = render(
-      <Suspense fallback="test loading">
-        <Time date="2017/12/23" />
-      </Suspense>
-    )
-    const lazyElement = await waitForElement(() => getByText(/years ago/i))
-    expect(lazyElement).toBeInTheDocument()
-  })
-})

src/components/molecules/Featured.tsx

@@ -4,11 +4,23 @@ import { Image } from '../atoms/Image'
 import styles from './Featured.module.scss'
 import { Post } from '../../@types/Post'
 
-function FeaturedPure({
+const query = graphql`
-  data
+  query {
-}: {
+    allMarkdownRemark(
-  data: { allMarkdownRemark: { edges: [{ node: Post }] } }
+      filter: { frontmatter: { featured: { eq: true } } }
-}) {
+      sort: { fields: [fields___date], order: DESC }
+    ) {
+      edges {
+        node {
+          ...PostTeaser
+        }
+      }
+    }
+  }
+`
+
+export default function Featured() {
+  const data = useStaticQuery(query)
   return (
     <div className={styles.featured}>
       {data.allMarkdownRemark.edges.map(({ node }: { node: Post }) => {
@@ -27,34 +39,3 @@ function FeaturedPure({
     </div>
   )
 }
-
-const query = graphql`
-  query {
-    allMarkdownRemark(
-      filter: { frontmatter: { featured: { eq: true } } }
-      sort: { fields: [fields___date], order: DESC }
-    ) {
-      edges {
-        node {
-          id
-          frontmatter {
-            title
-            image {
-              childImageSharp {
-                ...ImageFluidThumb
-              }
-            }
-          }
-          fields {
-            slug
-          }
-        }
-      }
-    }
-  }
-`
-
-export default function Featured() {
-  const data = useStaticQuery(query)
-  return <FeaturedPure data={data} />
-}

src/components/molecules/PostTeaser.tsx

@@ -1,9 +1,32 @@
 import React from 'react'
-import { Link } from 'gatsby'
+import { Link, graphql } from 'gatsby'
-import { Image } from '../../components/atoms/Image'
+import { Image } from '../atoms/Image'
 import styles from './PostTeaser.module.scss'
 import { Post } from '../../@types/Post'
 
+export const postTeaserQuery = graphql`
+  fragment PostTeaser on MarkdownRemark {
+    id
+    fileAbsolutePath
+    frontmatter {
+      title
+      type
+      linkurl
+      tags
+      featured
+      image {
+        childImageSharp {
+          ...ImageFluidThumb
+        }
+      }
+    }
+    fields {
+      slug
+      date(formatString: "MMMM DD, YYYY")
+    }
+  }
+`
+
 export default function PostTeaser({
   post,
   toggleSearch

src/components/molecules/RelatedPosts.tsx

@@ -1,6 +1,6 @@
 import React, { useState } from 'react'
 import { graphql, useStaticQuery } from 'gatsby'
-import PostTeaser from '../../templates/Post/PostTeaser'
+import PostTeaser from './PostTeaser'
 import styles from './RelatedPosts.module.scss'
 import { Post, Frontmatter } from '../../@types/Post'
 
@@ -9,23 +9,7 @@ const query = graphql`
     allMarkdownRemark(sort: { order: DESC, fields: [fields___date] }) {
       edges {
         node {
-          id
+          ...PostTeaser
-          fileAbsolutePath
-          frontmatter {
-            title
-            type
-            linkurl
-            tags
-            image {
-              childImageSharp {
-                ...ImageFluidThumb
-              }
-            }
-          }
-          fields {
-            slug
-            date(formatString: "MMMM DD, YYYY")
-          }
         }
       }
     }

src/components/molecules/Search/SearchResults.tsx

@@ -2,7 +2,7 @@ import React from 'react'
 import ReactDOM from 'react-dom'
 import { graphql, useStaticQuery } from 'gatsby'
 import Container from '../../atoms/Container'
-import PostTeaser from '../../../templates/Post/PostTeaser'
+import PostTeaser from '../PostTeaser'
 import SearchResultsEmpty from './SearchResultsEmpty'
 import styles from './SearchResults.module.scss'
 import { Post } from '../../../@types/Post'
@@ -16,18 +16,7 @@ const query = graphql`
     allMarkdownRemark {
       edges {
         node {
-          id
+          ...PostTeaser
-          frontmatter {
-            title
-            image {
-              childImageSharp {
-                ...ImageFluidThumb
-              }
-            }
-          }
-          fields {
-            slug
-          }
         }
       }
     }

src/components/molecules/ThemeSwitch.tsx

@@ -29,16 +29,7 @@ const ThemeToggleInput = ({
   />
 )
 
-export default function ThemeSwitch() {
+const HeadMarkup = ({ themeColor }: { themeColor: string }) => (
-  const darkMode = useDarkMode(false, {
-    classNameDark: 'dark',
-    classNameLight: 'light'
-  })
-
-  const themeColor = darkMode.value ? '#1d2224' : '#e7eef4'
-
-  return (
-    <>
   <Helmet>
     <meta name="theme-color" content={themeColor} />
     <meta
@@ -46,6 +37,18 @@ export default function ThemeSwitch() {
       content="black-translucent"
     />
   </Helmet>
+)
+
+export default function ThemeSwitch() {
+  const darkMode = useDarkMode(false, {
+    classNameDark: 'dark',
+    classNameLight: 'light'
+  })
+  const themeColor = darkMode.value ? '#1d2224' : '#e7eef4'
+
+  return (
+    <>
+      <HeadMarkup themeColor={themeColor} />
       <aside className={styles.themeSwitch}>
         <label
           htmlFor="toggle"

src/components/molecules/Vcard.test.tsx

@@ -1,28 +0,0 @@
-import React from 'react'
-import { render } from '@testing-library/react'
-
-import { VcardPure as Vcard } from './Vcard'
-import avatar from '../../../jest/__fixtures__/avatar.json'
-
-const links = [
-  'twitter.com',
-  'github.com',
-  'facebook.com',
-  'feed.xml',
-  'feed.json',
-  'whatever'
-]
-
-describe('Vcard', () => {
-  it('renders without crashing', () => {
-    const { container } = render(
-      <Vcard
-        avatar={avatar.edges[0].node.childImageSharp.fixed}
-        name="Hello You"
-        uri="https://demo.com"
-        links={links}
-      />
-    )
-    expect(container.firstChild).toBeInTheDocument()
-  })
-})

src/components/molecules/Vcard.tsx

@@ -1,37 +1,10 @@
 import React from 'react'
 import { graphql, useStaticQuery } from 'gatsby'
-import Img, { FixedObject } from 'gatsby-image'
+import Img from 'gatsby-image'
 import IconLinks from './Networks'
 import styles from './Vcard.module.scss'
 import { useSiteMetadata } from '../../hooks/use-site-metadata'
 
-export function VcardPure({
-  avatar,
-  uri,
-  name,
-  links
-}: {
-  avatar: FixedObject
-  uri: string
-  name: string
-  links: string[]
-}) {
-  return (
-    <div className={styles.vcard}>
-      <Img className={styles.avatar} fixed={avatar} alt="avatar" />
-      <p className={styles.description}>
-        Blog of designer &amp; developer{' '}
-        <a className="fn" rel="author" href={uri}>
-          {name}
-        </a>
-      </p>
-
-      <IconLinks links={links} />
-    </div>
-  )
-}
-
-export default function Vcard() {
 const query = graphql`
   query {
     avatar: allFile(filter: { name: { eq: "avatar" } }) {
@@ -48,11 +21,24 @@ export default function Vcard() {
   }
 `
 
+export default function Vcard() {
   const data = useStaticQuery(query)
   const { author, rss, jsonfeed } = useSiteMetadata()
   const { twitter, github, name, uri } = author
   const avatar = data.avatar.edges[0].node.childImageSharp.fixed
   const links = [twitter, github, rss, jsonfeed]
 
-  return <VcardPure avatar={avatar} links={links} uri={uri} name={name} />
+  return (
+    <div className={styles.vcard}>
+      <Img className={styles.avatar} fixed={avatar} alt="avatar" />
+      <p className={styles.description}>
+        Blog of designer &amp; developer{' '}
+        <a className="fn" rel="author" href={uri}>
+          {name}
+        </a>
+      </p>
+
+      <IconLinks links={links} />
+    </div>
+  )
 }

src/components/organisms/Footer.test.tsx

@@ -0,0 +1,7 @@
+import React from 'react'
+import testRender from '../../../jest/testRender'
+import Footer from './Footer'
+
+describe('Footer', () => {
+  testRender(<Footer />)
+})

src/components/organisms/Header.test.tsx

@@ -0,0 +1,7 @@
+import React from 'react'
+import testRender from '../../../jest/testRender'
+import Header from './Header'
+
+describe('Header', () => {
+  testRender(<Header />)
+})

src/hooks/use-site-metadata.ts

@@ -1,7 +1,6 @@
 import { useStaticQuery, graphql } from 'gatsby'
 import { Site } from '../@types/Site'
 
-export function useSiteMetadata(): Site {
 const query = graphql`
   query {
     site {
@@ -34,6 +33,7 @@ export function useSiteMetadata(): Site {
   }
 `
 
+export function useSiteMetadata(): Site {
   const { site } = useStaticQuery(query)
   return site.siteMetadata
 }

src/pages/__tests__/404.test.tsx

@@ -0,0 +1,13 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { createHistory, createMemorySource } from '@reach/router'
+
+import NotFound from '../404'
+
+describe('/404', () => {
+  const history = createHistory(createMemorySource('/404'))
+  it('renders without crashing', () => {
+    const { container } = render(<NotFound location={history.location} />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})

src/pages/__tests__/photos.test.tsx

@@ -0,0 +1,17 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { createHistory, createMemorySource } from '@reach/router'
+
+import Photos from '../photos'
+import data from '../../../jest/__fixtures__/photos.json'
+
+describe('/photos', () => {
+  const history = createHistory(createMemorySource('/photos'))
+
+  it('renders without crashing', () => {
+    const { container } = render(
+      <Photos data={data} location={history.location} />
+    )
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})

src/pages/__tests__/tags.test.tsx

@@ -0,0 +1,24 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { createHistory, createMemorySource } from '@reach/router'
+
+import Tags from '../tags'
+
+describe('/tags', () => {
+  const history = createHistory(createMemorySource('/tags'))
+  const data = {
+    allMarkdownRemark: {
+      group: [
+        { fieldValue: 'android', totalCount: 2 },
+        { fieldValue: 'aperture', totalCount: 18 }
+      ]
+    }
+  }
+
+  it('renders without crashing', () => {
+    const { container } = render(
+      <Tags data={data} location={history.location} />
+    )
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})

src/pages/__tests__/thanks.test.tsx

@@ -0,0 +1,13 @@
+import React from 'react'
+import { render, waitForElement } from '@testing-library/react'
+import Thanks from '../thanks'
+
+describe('/thanks', () => {
+  it('renders without crashing', async () => {
+    const { container } = render(<Thanks />)
+    const lazyElement = await waitForElement(() =>
+      container.querySelector('button')
+    )
+    expect(lazyElement).toBeInTheDocument()
+  })
+})

src/pages/photos.tsx

@@ -32,7 +32,7 @@ export default function Photos({
   data,
   location
 }: {
-  data: { photos: { edges: [{ node: Post }] } }
+  data: any
   location: Location
 }) {
   return (
@@ -42,7 +42,7 @@ export default function Photos({
       location={location}
       section={styles.photos}
     >
-      {data.photos.edges.map(({ node }) => (
+      {data.photos.edges.map(({ node }: { node: Post }) => (
         <PhotoThumb key={node.id} photo={node} />
       ))}
     </Page>

src/templates/Post/index.test.tsx

@@ -0,0 +1,17 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+
+import Post from '.'
+import data from '../../../jest/__fixtures__/post.json'
+
+describe('Post', () => {
+  const pageContext = {
+    next: { title: 'hello', slug: '/hello' },
+    prev: { title: 'hello2', slug: '/hello2' }
+  }
+
+  it('renders without crashing', () => {
+    const { container } = render(<Post data={data} pageContext={pageContext} />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})

src/templates/Posts.test.tsx

@@ -0,0 +1,28 @@
+import React from 'react'
+import { render } from '@testing-library/react'
+import { createHistory, createMemorySource } from '@reach/router'
+
+import Posts from './Posts'
+import data from '../../jest/__fixtures__/posts.json'
+
+describe('Post', () => {
+  const history = createHistory(createMemorySource('/photos'))
+
+  const pageContext = {
+    tag: 'hello',
+    slug: '/hello',
+    currentPageNumber: 2,
+    numPages: 20
+  }
+
+  it('renders without crashing', () => {
+    const { container } = render(
+      <Posts
+        data={data}
+        pageContext={pageContext}
+        location={history.location}
+      />
+    )
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})

src/templates/Posts.tsx

@@ -17,7 +17,7 @@ export default function Posts({
   location,
   pageContext
 }: {
-  data: { allMarkdownRemark: { edges: [{ node: Post }] } }
+  data: any
   location: Location
   pageContext: {
     tag: string