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panic_test.go
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panic_test.go
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package emperror
import (
"fmt"
"testing"
"emperror.dev/errors"
)
func TestPanic(t *testing.T) {
defer func() {
r := recover()
if r == nil {
t.Fatal("expected to recover from a panic, but nothing panicked")
}
err, ok := r.(error)
if !ok {
t.Fatal("expected to recover an error from a panic")
}
if err == nil {
t.Fatal("expected to the recovered error to be an error, received nil")
}
var stt stackTracer
if !errors.As(err, &stt) {
t.Fatal("error is expected to carry a stack trace")
}
st := stt.StackTrace()
if got, want := fmt.Sprintf("%n", st[0]), "TestPanic"; got != want {
t.Errorf("function name does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
if got, want := fmt.Sprintf("%s", st[0]), "panic_test.go"; got != want {
t.Errorf("file name does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
if got, want := fmt.Sprintf("%d", st[0]), "46"; got != want {
t.Errorf("line number does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
}()
Panic(errors.New("error"))
}
func TestPanic_NoError(t *testing.T) {
defer func() {
r := recover()
if r != nil {
t.Fatalf("unexpected panic, received: %v", r)
}
}()
Panic(nil)
}
func createRecoverFunc(p interface{}) func() error {
return func() (err error) {
defer func() {
err = Recover(recover())
}()
panic(p)
}
}
func assertRecoveredError(t *testing.T, err error, msg string) {
t.Helper()
var stt stackTracer
if !errors.As(err, &stt) {
t.Fatal("error is expected to carry a stack trace")
}
st := stt.StackTrace()
if got, want := fmt.Sprintf("%n", st[0]), "createRecoverFunc.func1"; got != want {
t.Errorf("function name does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
if got, want := fmt.Sprintf("%s", st[0]), "panic_test.go"; got != want {
t.Errorf("file name does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
if got, want := fmt.Sprintf("%d", st[0]), "66"; got != want {
t.Errorf("line number does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
if got, want := err.Error(), msg; got != want {
t.Errorf("error message does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
}
func TestRecover_ErrorPanic(t *testing.T) {
err := fmt.Errorf("internal error")
f := createRecoverFunc(err)
v := f()
assertRecoveredError(t, v, "internal error")
}
func TestRecover_StringPanic(t *testing.T) {
f := createRecoverFunc("internal error")
v := f()
assertRecoveredError(t, v, "internal error")
}
func TestRecover_AnyPanic(t *testing.T) {
f := createRecoverFunc(123)
v := f()
assertRecoveredError(t, v, "unknown panic, received: 123")
}
func TestRecover_Nil(t *testing.T) {
f := createRecoverFunc(nil)
v := f()
if got, want := v, error(nil); got != want {
t.Errorf("the recovered value is expected to be nil\nactual: %v", got)
}
}
func TestHandleRecover(t *testing.T) {
err := errors.New("error")
defer HandleRecover(ErrorHandlerFunc(func(err error) {
if got, want := err.Error(), "error"; got != want {
t.Errorf("error does not match the expected one\nactual: %s\nexpected: %s", got, want)
}
}))
panic(err)
}