code: func NotEmptyf(t TestingT, object interface{}, msg string, args ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	return NotEmpty(t, object, append([]interface{}{msg}, args...)...)
  }
docs: // NotEmptyf asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
  // a slice or a channel with len == 0.
  //
  //  if assert.NotEmptyf(t, obj, "error message %s", "formatted") {
  //    assert.Equal(t, "two", obj[1])
  //  }