backend: use generic implementation for ParseConfig tests

internal/backend/test/config.go

@@ -0,0 +1,28 @@
+package test
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+type ConfigTestData[C comparable] struct {
+	S   string
+	Cfg C
+}
+
+func ParseConfigTester[C comparable](t *testing.T, parser func(s string) (C, error), tests []ConfigTestData[C]) {
+	for i, test := range tests {
+		t.Run(fmt.Sprint(i), func(t *testing.T) {
+			cfg, err := parser(test.S)
+			if err != nil {
+				t.Fatalf("%s failed: %v", test.S, err)
+			}
+
+			if !reflect.DeepEqual(cfg, test.Cfg) {
+				t.Fatalf("input: %s\n wrong config, want:\n  %#v\ngot:\n  %#v",
+					test.S, test.Cfg, cfg)
+			}
+		})
+	}
+}