code refactor

pkg/avatars/null_avatar_provider_test.go

@@ -0,0 +1,20 @@
+package avatars
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/mayswind/ezbookkeeping/pkg/models"
+)
+
+func TestNullAvatarProvider_GetGravatarUrl(t *testing.T) {
+	avatarProvider := NewNullAvatarProvider()
+
+	expectedValue := ""
+	actualValue := avatarProvider.GetAvatarUrl(&models.User{
+		Email: "MyEmailAddress@example.com",
+	})
+
+	assert.Equal(t, expectedValue, actualValue)
+}