chore: add github actions test workflow

Author: zackschuster

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+on: push
+
+jobs:
+  test:
+    name: test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [^10.18.0, ^12.14.0, ^13.5.0, ^14.0.0]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+
+    steps:
+    - name: checkout
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+
+    - name: node
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+    - name: install
+      run: yarn
+
+    - name: test
+      run: yarn test