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