[#180] api: Add unittests

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>

api/handler/object_list_test.go

@@ -0,0 +1,37 @@
+package handler
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseContinuationToken(t *testing.T) {
+	var err error
+
+	t.Run("empty token", func(t *testing.T) {
+		var queryValues = map[string][]string{
+			"continuation-token": {""},
+		}
+		_, err = parseContinuationToken(queryValues)
+		require.Error(t, err)
+	})
+
+	t.Run("invalid not empty token", func(t *testing.T) {
+		var queryValues = map[string][]string{
+			"continuation-token": {"asd"},
+		}
+		_, err = parseContinuationToken(queryValues)
+		require.Error(t, err)
+	})
+
+	t.Run("valid token", func(t *testing.T) {
+		tokenStr := "75BTT5Z9o79XuKdUeGqvQbqDnxu6qWcR5EhxW8BXFf8t"
+		var queryValues = map[string][]string{
+			"continuation-token": {tokenStr},
+		}
+		token, err := parseContinuationToken(queryValues)
+		require.NoError(t, err)
+		require.Equal(t, tokenStr, token)
+	})
+}