ci: parallel vue 3 tests

.github/workflows/test-vue3.yml

@@ -13,13 +13,13 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+env:
+  dir: ./examples/vue3
+
 jobs:
-  build-and-test:
+  build:
     runs-on: ubuntu-latest
-    name: Build and test
-
-    env:
-      dir: ./examples/vue3
+    name: Build
 
     steps:
       - uses: actions/checkout@v2
@@ -57,9 +57,67 @@ jobs:
         working-directory: ${{env.dir}}
         run: pnpm run story:build
 
+      - name: Save build
+        uses: actions/upload-artifact@v3
+        with:
+          name: histoire-build
+          if-no-files-found: error
+          path: ${{env.dir}}/.histoire/dist
+          retention-days: 1
+
+
+  test:
+    runs-on: ubuntu-latest
+    name: Test
+    needs: build
+
+    strategy:
+      fail-fast: false
+      matrix:
+        containers: [0, 1, 2, 3, 4]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install node
+        uses: actions/setup-node@v2
+        with:
+          node-version: 16
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v2.2.4
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        run: |
+          echo "::set-output name=pnpm_cache_dir::$(pnpm store path)"
+
+      - name: Cache pnpm modules
+        uses: actions/cache@v2
+        with:
+          path: |
+            ${{ steps.pnpm-cache.outputs.pnpm_cache_dir }}
+            ~/.cache/Cypress
+          key: pnpm-v1-${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            pnpm-v1-${{ runner.os }}-
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Download the build
+        uses: actions/download-artifact@v3
+        with:
+          name: histoire-build
+          path: ${{env.dir}}/.histoire/dist
+
       - name: Run tests
         working-directory: ${{env.dir}}
         run: pnpm run ci
+        env:
+          # the number of containers in the job matrix
+          TOTAL_RUNNERS: 5
+          THIS_RUNNER: ${{ matrix.containers }}
 
       - uses: actions/upload-artifact@v2
         if: failure()

examples/vue3/cypress-parallel.mjs

@@ -0,0 +1,116 @@
+// @TODO move to playwright
+
+import fs from 'fs/promises'
+import { globby } from 'globby'
+import { minimatch } from 'minimatch'
+import { exec } from 'child_process'
+
+const totalRunners = parseInt(process.env.TOTAL_RUNNERS)
+const thisRunner = parseInt(process.env.THIS_RUNNER)
+
+// These are the same properties that are set in cypress.config.
+// In practice, it's better to export these from another file, and
+// import them here and in cypress.config, so that both files use
+// the same values.
+const specPatterns = {
+  specPattern: './cypress/integration/*.{ts,tsx,js,jsx}',
+  excludeSpecPattern: ['tsconfig.json'],
+}
+
+// used to roughly determine how many tests are in a file
+const testPattern = /(^|\s)(it|test)\(/g
+
+async function getTestCount (filePath) {
+  const content = await fs.readFile(filePath, 'utf8')
+  return content.match(testPattern)?.length || 0
+}
+
+// adapated from:
+// https://github.com/bahmutov/find-cypress-specs/blob/main/src/index.js
+async function getSpecFilePaths () {
+  const options = specPatterns
+
+  const files = await globby(options.specPattern, {
+    ignore: options.excludeSpecPattern,
+  })
+
+  // go through the files again and eliminate files that match
+  // the ignore patterns
+  const ignorePatterns = [...(options.excludeSpecPattern || [])]
+
+  // a function which returns true if the file does NOT match
+  // all of our ignored patterns
+  const doesNotMatchAllIgnoredPatterns = (file) => {
+    // using {dot: true} here so that folders with a '.' in them are matched
+    // as regular characters without needing an '.' in the
+    // using {matchBase: true} here so that patterns without a globstar **
+    // match against the basename of the file
+    const MINIMATCH_OPTIONS = { dot: true, matchBase: true }
+    return ignorePatterns.every((pattern) => {
+      return !minimatch(file, pattern, MINIMATCH_OPTIONS)
+    })
+  }
+
+  const filtered = files.filter(doesNotMatchAllIgnoredPatterns)
+
+  return filtered
+}
+
+async function sortSpecFilesByTestCount (specPathsOriginal) {
+  const specPaths = [...specPathsOriginal]
+
+  const testPerSpec = {}
+
+  for (const specPath of specPaths) {
+    testPerSpec[specPath] = await getTestCount(specPath)
+  }
+
+  return (
+    Object.entries(testPerSpec)
+      // Sort by the number of tests per spec file, so that we get a bit closer to
+      // splitting up the files evenly between the runners. It won't be perfect,
+      // but better than just splitting them randomly. And this will create a
+      // consistent file list/ordering so that file division is deterministic.
+      .sort((a, b) => b[1] - a[1])
+      .map((x) => x[0])
+  )
+}
+
+export function splitSpecs (specs, totalRunners, thisRunner) {
+  return specs.filter((_, index) => index % totalRunners === thisRunner)
+}
+
+(async () => {
+  try {
+    const specFilePaths = await sortSpecFilesByTestCount(await getSpecFilePaths())
+
+    if (!specFilePaths.length) {
+      throw Error('No spec files found.')
+    }
+
+    const specsToRun = splitSpecs(specFilePaths, totalRunners, thisRunner)
+
+    const command = `yarn cypress run --spec "${specsToRun.join(',')}"`
+
+    console.log(`Running: ${command}`)
+
+    const commandProcess = exec(command)
+
+    // pipe output because we want to see the results of the run
+
+    if (commandProcess.stdout) {
+      commandProcess.stdout.pipe(process.stdout)
+    }
+
+    if (commandProcess.stderr) {
+      commandProcess.stderr.pipe(process.stderr)
+    }
+
+    commandProcess.on('exit', (code) => {
+      process.exit(code || 0)
+    })
+  } catch (err) {
+    console.error(err)
+    process.exit(1)
+  }
+})()

examples/vue3/package.json

@@ -8,7 +8,7 @@
     "story:build": "histoire build",
     "story:preview": "histoire preview --port 4567",
     "ci": "start-server-and-test story:preview http://localhost:4567/ test",
-    "test": "cypress run",
+    "test": "node ./cypress-parallel.mjs",
     "test:dev": "cypress open --config baseUrl=http://localhost:6006",
     "test:examples": "pnpm run story:build && pnpm run ci"
   },
@@ -23,7 +23,9 @@
     "@histoire/vendors": "workspace:*",
     "@vitejs/plugin-vue": "^4.0.0",
     "cypress": "^9.5.3",
+    "globby": "^13.2.2",
     "histoire": "workspace:*",
+    "minimatch": "^9.0.3",
     "nodemon": "^2.0.20",
     "sass": "^1.50.0",
     "start-server-and-test": "^1.14.0",