feat: add global test framework and tests

.github/actions/test/action.yml

@@ -11,6 +11,8 @@ runs:
         cache: 'npm'
     - run: npm ci
       shell: bash
+    - run: npm run lint
+      shell: bash
     - run: npm run compile
       shell: bash
     - run: npm run build

.gitignore

@@ -1,2 +1,3 @@
-node_modules
 build
+coverage
+node_modules

babel.config.js

@@ -13,5 +13,13 @@ module.exports = {
     ],
     '@babel/preset-typescript',
     '@babel/preset-react'
-  ]
+  ],
+  env: {
+    test: {
+      plugins: [
+        // everything needs to be cjs for jest
+        ['@babel/plugin-transform-modules-commonjs', { loose: true, importInterop: 'node' }]
+      ]
+    }
+  }
 }

jest.config.js

@@ -0,0 +1,30 @@
+const path = require('path')
+const { lstatSync, readdirSync } = require('fs')
+
+// get listing of packages in the mono repo
+const basePath = path.resolve(__dirname, 'packages')
+const packages = readdirSync(basePath)
+  .filter((name) => {
+    return lstatSync(path.join(basePath, name)).isDirectory()
+  })
+  .sort((a, b) => b.length - a.length)
+
+// node_modules that need babel transform e.g. because not export cjs
+const esmodules = ['@ipld/unixfs', 'actor'].join('|')
+
+module.exports = {
+  collectCoverage: true,
+  coverageReporters: ['json', 'lcov', 'text', 'clover', 'text-summary'],
+  projects: packages.map((d) => ({
+    displayName: d,
+    clearMocks: true,
+    // testEnvironment: 'jsdom',
+    testEnvironment: './jest.env.js',
+    testMatch: [`<rootDir>/packages/${d}/**/*.test.[jt]s?(x)`],
+    // setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+    snapshotFormat: {
+      printBasicPrototype: false
+    },
+    transformIgnorePatterns: [`/node_modules/(?!${esmodules})`]
+  }))
+}

jest.env.js

@@ -0,0 +1,18 @@
+const JSDOMEnvironment = require('jest-environment-jsdom')
+const { TransformStream } = require('stream/web')
+const { Blob, File } = require('@web-std/file')
+
+// Extends the default JSDOMEnvironment to add globals that are present in all
+// browsers and NodeJS that have not yet been added to the jsdom environment.
+module.exports = class extends JSDOMEnvironment {
+  constructor (config, options) {
+    super(config, options)
+    Object.assign(this.global, {
+      TextEncoder,
+      TextDecoder,
+      TransformStream,
+      Blob,
+      File
+    })
+  }
+}