code: func Truef(t TestingT, value bool, msg string, args ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	return True(t, value, append([]interface{}{msg}, args...)...)
  }
docs: // Truef asserts that the specified value is true.
  //
  //    assert.Truef(t, myBool, "error message %s", "formatted")