fix: add a test stage that runs on windows (#14)

.github/workflows/build.yml

@@ -9,6 +9,26 @@ on:
   pull_request:
 
 jobs:
+  WindowsTest:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.15
+      - name: Cache Go modules
+        uses: actions/cache@v1
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Test
+        run: go test -v -failfast -race -coverpkg=./... -covermode=atomic -coverprofile=coverage.txt ./...
   build:
     runs-on: ubuntu-latest
     steps: