cast/semantic_test.go

package cast_test

import (
	"testing"
	"apigo.cc/go/cast"
)

func TestTo(t *testing.T) {
	// Basic types
	if v := cast.To[int]("123"); v != 123 {
		t.Errorf("To[int] failed: %v", v)
	}
	if v := cast.To[int]("abc"); v != 0 {
		t.Errorf("To[int] for invalid input should be 0, got %v", v)
	}

	// Slice
	s := cast.To[[]int]([]string{"1", "2", "3"})
	if len(s) != 3 || s[0] != 1 || s[1] != 2 || s[2] != 3 {
		t.Errorf("To[[]int] failed: %v", s)
	}

	// Map
	m := cast.To[map[string]int](map[string]string{"a": "1", "b": "2"})
	if len(m) != 2 || m["a"] != 1 || m["b"] != 2 {
		t.Errorf("To[map[string]int] failed: %v", m)
	}

	// JSON Auto conversion (Struct to String)
	type User struct {
		Name string `json:"name"`
	}
	u := User{Name: "Alice"}
	js := cast.To[string](u)
	if js != `{"name":"Alice"}` {
		t.Errorf("To[string] for struct failed: %v", js)
	}

	// JSON Auto conversion (String to Struct)
	u2 := cast.To[User](`{"name":"Bob"}`)
	if u2.Name != "Bob" {
		t.Errorf("To[User] from string failed: %v", u2)
	}
}

func TestAsWrapper(t *testing.T) {
	// As
	if v := cast.As(123, nil); v != 123 {
		t.Errorf("As failed: %v", v)
	}
}

func TestMapSliceAPIs(t *testing.T) {
	// ToMap
	m := cast.As(cast.ToMap[string, int]([]any{"a", "1", "b", 2}))
	if m["a"] != 1 || m["b"] != 2 {
		t.Errorf("ToMap failed: %v", m)
	}

	// ToSlice
	s := cast.As(cast.ToSlice[int]([]string{"10", "20"}))
	if len(s) != 2 || s[0] != 10 || s[1] != 20 {
		t.Errorf("ToSlice failed: %v", s)
	}
}