Add more unit tests

backend/internal/model/pageinfo_test.go

@@ -0,0 +1,27 @@
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPageInfoGetSort(t *testing.T) {
+	t.Parallel()
+	pi := PageInfo{}
+	def := Sort{
+		Field:     "name",
+		Direction: "asc",
+	}
+	defined := Sort{
+		Field:     "nickname",
+		Direction: "desc",
+	}
+	// default
+	sort := pi.GetSort(def)
+	assert.Equal(t, sort, []Sort{def})
+	// defined
+	pi.Sort = []Sort{defined}
+	sort = pi.GetSort(def)
+	assert.Equal(t, sort, []Sort{defined})
+}