Add test file

Signed-off-by: Wenqi Qiu <wenqiq@vmware.com>

util/util_test.go

@@ -0,0 +1,15 @@
+package util
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func add(a, b int) int {
+	return a + b
+}
+
+func TestAdd(t *testing.T) {
+	assert.Equal(t, 3, add(1, 2))
+}