--- /dev/null
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+// File errors.go provides error types that may occur in more than one component.
+
+package boruta
+
+import "fmt"
+
+// NotFoundError is used whenever searched element is missing.
+type NotFoundError string
+
+func (err NotFoundError) Error() string {
+ return fmt.Sprintf("%s not found", string(err))
+}
--- /dev/null
+/*
+ * Copyright (c) 2017 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package boruta
+
+import (
+ "testing"
+
+ "github.com/stretchr/testify/assert"
+)
+
+func TestNotFoundErrorString(t *testing.T) {
+ str := "request not found"
+ assert.Equal(t, str, NotFoundError("request").Error())
+}