error_test.go

package main

import (
	"errors"
	"testing"
)

// run test
// go test .
//
// run bench
// go test -bench=.
//
// results:

// goos: linux
// goarch: amd64
// pkg: github.com/vanhtuan0409/go-handle-error
// cpu: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
// BenchmarkPanic-8    	 5318145	       226.4 ns/op
// BenchmarkNormal-8   	1000000000	         0.2616 ns/op
// PASS
// ok  	github.com/vanhtuan0409/go-handle-error	1.726s

func PanicError() (err error) {
	defer func() {
		r := recover()
		err, _ = r.(error)
	}()

	panic(errors.New("error"))
}

func NormalError() error {
	return errors.New("error")
}

func TestCorrectness(t *testing.T) {
	var err error
	err = PanicError()
	if err == nil {
		t.Error("Failed PanicError")
		return
	}

	err = NormalError()
	if err == nil {
		t.Error("Failed NormalError")
		return
	}
}

func BenchmarkPanic(b *testing.B) {
	for i := 0; i < b.N; i++ {
		PanicError()
	}
}

func BenchmarkNormal(b *testing.B) {
	for i := 0; i < b.N; i++ {
		NormalError()
	}
}