test: add test

internal/proxy/envoy/xds/ads/pubsub_test.go

@@ -0,0 +1,28 @@
+package ads_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/goto/shield/internal/proxy/envoy/xds/ads"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPush(t *testing.T) {
+	message := ads.Message{
+		NodeID:      "node-1",
+		VersionInfo: "v1",
+		Nonce:       "test",
+		TypeUrl:     ads.CLUSTER_TYPE_URL,
+	}
+	messageChan := make(ads.MessageChan, 1)
+
+	err := messageChan.Push(message)
+	recv := <-messageChan
+	assert.NoError(t, err)
+	assert.Equal(t, message, recv)
+
+	close(messageChan)
+	err = messageChan.Push(message)
+	assert.True(t, errors.Is(err, ads.ErrChannelClosed))
+}