package langext

import (
	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
	"testing"
)

func TestDeepCopyByJsonStruct(t *testing.T) {
	type item struct {
		Name string `json:"name"`
		Age  int    `json:"age"`
	}
	src := item{Name: "alice", Age: 30}
	dst, err := DeepCopyByJson(src)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	tst.AssertEqual(t, dst.Name, "alice")
	tst.AssertEqual(t, dst.Age, 30)
}

func TestDeepCopyByJsonSlice(t *testing.T) {
	src := []int{1, 2, 3}
	dst, err := DeepCopyByJson(src)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	tst.AssertArrayEqual(t, dst, []int{1, 2, 3})

	// Mutating the copy must not affect the source
	dst[0] = 99
	tst.AssertEqual(t, src[0], 1)
}

func TestDeepCopyByJsonError(t *testing.T) {
	type bad struct {
		C chan int
	}
	_, err := DeepCopyByJson(bad{C: make(chan int)})
	if err == nil {
		t.Errorf("expected error for un-marshalable type")
	}
}