add some testing (adoptium#403)

* add some testing

* linter fixes

* fix babel/preset-react

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+---
+name: Linter
+
+on:
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  ci:
+    name: Run CI
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '16'
+      - run: npm install
+      - run: npm test

babel.config.json

@@ -0,0 +1,6 @@
+{
+    "presets": [
+      [ "@babel/preset-env", { "targets": { "node": true } } ],
+      [ "@babel/preset-react" ]
+    ]
+  }

jest-preprocess.js

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+const babelOptions = {
+  presets: ['babel-preset-gatsby', '@babel/preset-typescript']
+}
+
+module.exports = require('babel-jest').default.createTransformer(babelOptions)

jest.config.js

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+module.exports = {
+  transform: {
+    '^.+\\.[jt]sx?$': '<rootDir>/jest-preprocess.js'
+  },
+  moduleNameMapper: {
+    '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
+    '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '<rootDir>/__mocks__/file-mock.js',
+    '^gatsby-page-utils/(.*)$': 'gatsby-page-utils/dist/$1', // Workaround for https://github.com/facebook/jest/issues/9771
+    '^gatsby-core-utils/(.*)$': 'gatsby-core-utils/dist/$1', // Workaround for https://github.com/facebook/jest/issues/9771
+    '^gatsby-plugin-utils/(.*)$': [
+      'gatsby-plugin-utils/dist/$1',
+      'gatsby-plugin-utils/$1'
+    ] // Workaround for https://github.com/facebook/jest/issues/9771
+  },
+  testPathIgnorePatterns: ['node_modules', '\\.cache', '<rootDir>.*/public'],
+  transformIgnorePatterns: ['node_modules/(?!(gatsby)/)'],
+  globals: {
+    __PATH_PREFIX__: ''
+  },
+  testURL: 'http://localhost',
+  setupFiles: ['<rootDir>/loadershim.js'],
+  testEnvironment: 'jest-environment-jsdom'
+}

loadershim.js

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+global.___loader = {
+  enqueue: jest.fn()
+}