Add GitHub actions test workflow

.github/workflows/test.yml

@@ -0,0 +1,41 @@
+name: test
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+env:
+  GOPROXY: https://proxy.golang.org/
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 10
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+        go:
+          - 1.16
+          - 1.17
+          - 1.18
+          - 1.19
+    steps:
+      - name: Checkout
+        uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # https://github.com/actions/checkout/releases/tag/v3.3.0
+      - name: Set up Go
+        uses: actions/setup-go@6edd4406fa81c3da01a34fa6f6343087c207a568 # https://github.com/actions/setup-go/releases/tag/v3.5.0
+        with:
+          go-version: ${{ matrix.go }}
+      - name: Go mod download
+        run: go mod download -x
+      - name: Go mod verify
+        run: go mod verify
+      - name: Run tests
+        run: go test -v ./...