code: func (a *Assertions) NotPanicsf(f PanicTestFunc, msg string, args ...interface{}) bool {
  	if h, ok := a.t.(tHelper); ok {
  		h.Helper()
  	}
  	return NotPanicsf(a.t, f, msg, args...)
  }
docs: // NotPanicsf asserts that the code inside the specified PanicTestFunc does NOT panic.
  //
  //   a.NotPanicsf(func(){ RemainCalm() }, "error message %s", "formatted")