func TestNewf(t *testing.T) {
err := errstack.Newf("my bad %d", 42)
if err == nil {
t.Fatalf("expected an error. got=%#v\n", err)
}
if err, ok := err.(*errstack.Error); !ok {
t.Fatalf("expected an *errstack.Error. got=%T\n", err)
} else {
exp := fmt.Errorf("my bad %d", 42)
if !reflect.DeepEqual(err.Err, exp) {
t.Fatalf("expected err.Err=%v.\ngot=%v\n", exp, err.Err)
}
}
}
// Errorf formats according to a format specifier and returns the string as
// a value that satisfies error, together with the associated stack trace.
func Errorf(format string, args ...interface{}) error {
return errstack.Newf(format, args...)
}