package lang

import (
	"strings"
	"testing"
)

func TestGenerateGoJSONDecodeReturnsTypedValue(t *testing.T) {
	prog, err := Parse(`
package demo

import json encoding.json

fun decode(body: ByteSlice): List<Account> {
    val accounts = json.decode<List<Account>>(body).unwrap()
    return accounts
}
`)
	if err != nil {
		t.Fatalf("parse failed: %v", err)
	}
	out, err := GenerateGo(prog)
	if err != nil {
		t.Fatalf("generation failed: %v", err)
	}
	for _, want := range []string{"accounts := gotlinResultUnwrap(gotlinJSONDecode[[]Account](body))", "json.Unmarshal(body, &value)"} {
		if !strings.Contains(string(out), want) {
			t.Fatalf("generated Go missing %q:\n%s", want, out)
		}
	}
}