diff --git a/persistence/helpers_test.go b/persistence/helpers_test.go
index dbecce12b..4c4a10f0c 100644
--- a/persistence/helpers_test.go
+++ b/persistence/helpers_test.go
@@ -1,12 +1,57 @@
 package persistence
 
 import (
+	"time"
+
 	"github.com/Masterminds/squirrel"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
 
 var _ = Describe("Helpers", func() {
+	Describe("toSnakeCase", func() {
+		It("converts camelCase", func() {
+			Expect(toSnakeCase("camelCase")).To(Equal("camel_case"))
+		})
+		It("converts PascalCase", func() {
+			Expect(toSnakeCase("PascalCase")).To(Equal("pascal_case"))
+		})
+		It("converts ALLCAPS", func() {
+			Expect(toSnakeCase("ALLCAPS")).To(Equal("allcaps"))
+		})
+		It("does not converts snake_case", func() {
+			Expect(toSnakeCase("snake_case")).To(Equal("snake_case"))
+		})
+	})
+	Describe("toSqlArgs", func() {
+		type Model struct {
+			ID        string `json:"id"`
+			AlbumId   string `json:"albumId"`
+			PlayCount int    `json:"playCount"`
+			CreatedAt *time.Time
+		}
+
+		It("returns a map with snake_case keys", func() {
+			now := time.Now()
+			m := &Model{ID: "123", AlbumId: "456", CreatedAt: &now, PlayCount: 2}
+			args, err := toSqlArgs(m)
+			Expect(err).To(BeNil())
+			Expect(args).To(HaveKeyWithValue("id", "123"))
+			Expect(args).To(HaveKeyWithValue("album_id", "456"))
+			Expect(args).To(HaveKey("created_at"))
+			Expect(args).To(HaveLen(3))
+		})
+
+		It("remove null fields", func() {
+			m := &Model{ID: "123", AlbumId: "456"}
+			args, err := toSqlArgs(m)
+			Expect(err).To(BeNil())
+			Expect(args).To(HaveKey("id"))
+			Expect(args).To(HaveKey("album_id"))
+			Expect(args).To(HaveLen(2))
+		})
+	})
+
 	Describe("Exists", func() {
 		It("constructs the correct EXISTS query", func() {
 			e := exists("album", squirrel.Eq{"id": 1})