/**
  * @covers tad_Arg_Check::is_failing
  */
 public function testIs_failing()
 {
     $this->assertTrue($this->tad_arg_check->is_failing());
 }
 /**
  * @covers tad_Arg_Check::is_failing
  */
 public function testIsNot_failing()
 {
     $this->assertFalse($this->tad_arg_check->is_failing());
 }