build: add GitHub actions config for unit tests

.github/workflows/ci.yaml

@@ -0,0 +1,57 @@
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+name: ci
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node: [8, 10, 12, 13]
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node }}
+      - run: node --version
+      - run: npm install
+      - run: npm test
+  windows:
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm test
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run lint
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm run docs-test
+  coverage:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 12
+      - run: npm install
+      - run: npm test
+      - run: ./node_modules/.bin/c8 report --reporter=text-lcov | npx codecov@3 -t ${{ secrets.CODECOV_TOKEN }} --pipe

package.json

@@ -94,7 +94,8 @@
     "webpack": "webpack",
     "browser-test": "karma start",
     "docs-test": "linkinator docs",
-    "predocs-test": "npm run docs"
+    "predocs-test": "npm run docs",
+    "prelint": "cd samples; npm link ../"
   },
   "license": "Apache-2.0"
 }