cast_test.go

package gocast

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCast(t *testing.T) {
	type testStructType struct {
		S string `json:"s"`
		A int    `json:"a"`
		B bool   `json:"b"`
	}
	var (
		tests = []any{
			int(100), int8(100), int16(100), int32(100), int64(100),
			uint(100), uint8(100), uint16(100), uint32(100), uint64(100),
			uintptr(100), float32(100.), float64(100.),
			"100", []byte("100"), &[]int32{100}[0],
		}
		testStruct = testStructType{S: "test", A: 1, B: true}
	)

	t.Run("simple", func(t *testing.T) {
		assert.Equal(t, 1, Cast[int](true))
		assert.Equal(t, int8(0), Cast[int8](false))
		assert.Equal(t, int16(100), Cast[int16]("100"))
		assert.Equal(t, int32(100), Cast[int32]("100"))
		assert.Equal(t, int64(100), Cast[int64]("100"))
		assert.Equal(t, uint(1), Cast[uint](true))
		assert.Equal(t, uint8(0), Cast[uint8](false))
		assert.Equal(t, uint16(100), Cast[uint16]("100"))
		assert.Equal(t, uint32(100), Cast[uint32]("100"))
		assert.Equal(t, uint64(100), Cast[uint64]("100"))
		assert.Equal(t, uint64(100), Cast[uint64](&[]int32{100}[0]))
		assert.Equal(t, true, Cast[bool](100))
		assert.Equal(t, testStructType{}, ToType(testStructType{}, nil))
	})

	t.Run("int", func(t *testing.T) {
		for _, v := range tests {
			assert.Equal(t, 100, Cast[int](v))
			assert.Equal(t, 100, CastRecursive[int](v))
		}
	})

	t.Run("float", func(t *testing.T) {
		for _, v := range tests {
			assert.Equal(t, float32(100), Cast[float32](v))
			assert.Equal(t, float32(100), CastRecursive[float32](v))
			assert.Equal(t, float64(100), Cast[float64](v))
			assert.Equal(t, float64(100), CastRecursive[float64](v))
		}
	})

	t.Run("string", func(t *testing.T) {
		for _, v := range tests {
			assert.Equal(t, "100", strings.TrimSuffix(Cast[string](v), ".0"))
			assert.Equal(t, "100", strings.TrimSuffix(CastRecursive[string](v), ".0"))
		}
	})

	t.Run("struct", func(t *testing.T) {
		mp := Cast[map[string]any](&testStruct, "json")
		if assert.NotNil(t, mp) {
			newStruct, err := TryCast[testStructType](mp, "json")
			assert.NoError(t, err)
			assert.Equal(t, testStruct, newStruct)
		}
	})
}