func TestNewNoHysteresis(t *testing.T) {
exp := fmt.Errorf("my bad %d", 42)
err := errstack.New(exp)
if err == nil {
t.Fatalf("expected a non-nil error. got=%#v\n", err)
}
errs := err.(*errstack.Error)
n := len(errs.Stack)
err = newerr(err)
if err == nil {
t.Fatalf("expected a non-nil error. got=%#v\n", err)
}
errs = err.(*errstack.Error)
if n != len(errs.Stack) {
t.Fatalf("hysteresis detected:\nold-stack=%d\nnew-stack=%d\n",
n,
len(errs.Stack),
)
}
err = newerr(errs.Err)
errs = err.(*errstack.Error)
if n == len(errs.Stack) {
t.Fatalf("hysteresis error:\nold-stack=%d\nnew-stack=%d\n%v\n",
n,
len(errs.Stack),
errs,
)
}
}
func TestNew(t *testing.T) {
exp := fmt.Errorf("my bad %d", 42)
err := errstack.New(exp)
if err == nil {
t.Fatalf("expected a non-nil error. got=%#v\n", err)
}
if err, ok := err.(*errstack.Error); !ok {
t.Fatalf("expected an *errstack.Error. got=%T\n", err)
} else {
if !reflect.DeepEqual(err.Err, exp) {
t.Fatalf("expected err.Err=%v.\ngot=%v\n", exp, err.Err)
}
}
}
// Error returns the original error with the associated stack trace.
func Error(err error) error {
return errstack.New(err)
}
// adds another stack-frame
func newerr(err error) error {
return errstack.New(err)
}
func TestNewNil(t *testing.T) {
err := errstack.New(nil)
if err != nil {
t.Fatalf("expected a nil error. got=%#v\n", err)
}
}