versioned documentation

site/__mocks__/documentation.js

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+module.exports = [
+  {
+    id: '2a252835-849d-5e11-9b71-a4a18defc55b',
+    excerpt:
+      'Quick Start Install the latest version of Node.js, clone this repo and then:\n\nTo create a build locally:\n\nConfiguration\n\nThis static site…',
+    frontmatter: {
+      title: 'Development',
+    },
+    internal: {
+      contentFilePath:
+        '/Users/mimiflynn/Projects/MS/ms-gh-pages/site/content/documentation/intro-doc.mdx',
+    },
+    fields: {
+      slug: '/documentation/intro-doc/',
+    },
+  },
+  {
+    id: '9cbc3eec-d3ce-522a-b2fd-197c8407b252',
+    excerpt:
+      'This static site generator processes MDX  in addition to traditional Markdown  files.  allows for the use of JSX components within Markdown.…',
+    frontmatter: {
+      title: 'Components 2.0',
+    },
+    internal: {
+      contentFilePath:
+        '/Users/mimiflynn/Projects/MS/ms-gh-pages/site/content/documentation/2.0/components.mdx',
+    },
+    fields: {
+      slug: '/documentation/2.0/components/',
+    },
+  },
+  {
+    id: '41748935-af24-51c3-8d32-458375e4246c',
+    excerpt:
+      'This static site generator processes MDX  in addition to traditional Markdown  files.  allows for the use of JSX components within Markdown.…',
+    frontmatter: {
+      title: 'Components',
+    },
+    internal: {
+      contentFilePath:
+        '/Users/mimiflynn/Projects/MS/ms-gh-pages/site/content/documentation/1.0/components.mdx',
+    },
+    fields: {
+      slug: '/documentation/1.0/components/',
+    },
+  },
+];

site/__mocks__/file-mock.js

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+// https://www.gatsbyjs.com/docs/how-to/testing/unit-testing/
+
+module.exports = 'test-file-stub';

site/__mocks__/gatsby.js

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+// https://www.gatsbyjs.com/docs/how-to/testing/unit-testing/
+
+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,
+      })
+  ),
+  Slice: jest.fn().mockImplementation(({ alias, ...rest }) =>
+    React.createElement('div', {
+      ...rest,
+      'data-test-slice-alias': alias,
+    })
+  ),
+  useStaticQuery: jest.fn(),
+};

site/jest.config.js

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+// https://www.gatsbyjs.com/docs/how-to/testing/unit-testing/
+
+module.exports = {
+  transform: {
+    '^.+\\.jsx?$': `<rootDir>/tests/jest-preprocess.js`,
+  },
+  moduleNameMapper: {
+    '.+\\.(css|styl|less|sass|scss)$': `identity-obj-proxy`,
+    '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': `<rootDir>/__mocks__/file-mock.js`,
+  },
+  testPathIgnorePatterns: [`node_modules`, `\\.cache`, `<rootDir>.*/public`],
+  transformIgnorePatterns: [
+    `node_modules/(?!(gatsby|gatsby-script|gatsby-link)/)`,
+  ],
+  globals: {
+    __PATH_PREFIX__: ``,
+  },
+  testEnvironmentOptions: {
+    url: `http://localhost`,
+  },
+  setupFiles: [`<rootDir>/tests/loadershim.js`],
+  testEnvironment: `jsdom`,
+  setupFilesAfterEnv: ['<rootDir>/tests/setup-test-env.js'],
+};