/**
  * isTrueVal testen
  */
 public function testIsTrueVal()
 {
     $this->assertTrue(tx_mklib_util_String::isTrueVal(true));
     $this->assertTrue(tx_mklib_util_String::isTrueVal('true'));
     $this->assertTrue(tx_mklib_util_String::isTrueVal('TrUe'));
     $this->assertTrue(tx_mklib_util_String::isTrueVal('1'));
     $this->assertTrue(tx_mklib_util_String::isTrueVal(1));
     $this->assertFalse(tx_mklib_util_String::isTrueVal(false));
     $this->assertFalse(tx_mklib_util_String::isTrueVal('false'));
     $this->assertFalse(tx_mklib_util_String::isTrueVal('0'));
     $this->assertFalse(tx_mklib_util_String::isTrueVal(0));
 }