cast/semantic_test.go

package cast_test

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

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

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

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

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

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

func TestQuietMust(t *testing.T) {
	// Quiet
	if v := cast.Quiet(cast.To[int]("abc")); v != 0 {
		t.Errorf("Quiet failed: %v", v)
	}
	if v := cast.Quiet(cast.To[int]("123")); v != 123 {
		t.Errorf("Quiet failed: %v", v)
	}

	// Must
	defer func() {
		if r := recover(); r == nil {
			t.Errorf("Must should panic on error")
		}
	}()
	cast.Must(cast.To[int]("abc"))
}

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

	// As[map...]
	m2 := cast.As[map[string]int]([]any{"c", "3"})
	if m2["c"] != 3 {
		t.Errorf("As[map] failed: %v", m2)
	}

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

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