cast/conversion_test.go

package cast_test

import (
	"testing"

	"apigo.cc/go/cast"
)

func TestToMap(t *testing.T) {
	// Test struct-to-map with inheritance
	type Base struct {
		ID int
	}
	type User struct {
		Base
		Name string
	}
	u := User{Base: Base{ID: 1}, Name: "Tom"}
	m1 := make(map[string]any)
	cast.FillMap(m1, u)
	if m1["ID"] != 1 || m1["name"] != "Tom" {
		t.Errorf("Struct inheritance to map failed: %v", m1)
	}

	// Test slice-to-map (KV)
	m2 := cast.As(cast.ToMap[int, string]([]any{"1", "a", 2, 200}))
	if m2[1] != "a" || m2[2] != "200" {
		t.Errorf("Slice-to-map failed: %v", m2)
	}
}

func TestToSlice(t *testing.T) {
	// Test primitive-to-slice (overwrite)
	var s1 []int
	cast.FillSlice(&s1, "123")
	if len(s1) != 1 || s1[0] != 123 {
		t.Errorf("Primitive-to-slice failed: %v", s1)
	}

	// Test slice-to-slice (overwrite)
	cast.FillSlice(&s1, []string{"456"})
	if len(s1) != 1 || s1[0] != 456 {
		t.Errorf("Slice-to-slice overwrite failed: %v", s1)
	}
}

func TestJSON(t *testing.T) {
	type Config struct {
		Port int `json:"port"`
	}
	data := `{"port": 8080}`
	
	// Test UnmarshalJSON
	var c1 Config
	err := cast.UnmarshalJSON(data, &c1)
	if err != nil || c1.Port != 8080 {
		t.Errorf("UnmarshalJSON failed: %v, %v", err, c1)
	}

	// Test FromJSON
	c2 := cast.As(cast.FromJSON[Config]([]byte(data)))
	if c2.Port != 8080 {
		t.Errorf("FromJSON failed: %v", c2)
	}

	// Test To[T] from JSON
	c3 := cast.To[Config](data)
	if c3.Port != 8080 {
		t.Errorf("To[Config] failed: %v", c3)
	}
}

func TestGenericToSlice(t *testing.T) {
	// Test To with various inputs
	s1 := cast.To[[]int]("123")
	if len(s1) != 1 || s1[0] != 123 {
		t.Errorf("To[[]int] primitive failed: %v", s1)
	}

	s2 := cast.To[[]string]([]int{1, 2})
	if len(s2) != 2 || s2[0] != "1" || s2[1] != "2" {
		t.Errorf("To[[]string] slice failed: %v", s2)
	}
}