/**
  * @group utility
  */
 function testIsCurrency()
 {
     $this->assertFalse(InputValidator::isCurrency(""));
     $this->assertFalse(InputValidator::isCurrency(123));
     $this->assertFalse(InputValidator::isCurrency("notvalid"));
     $this->assertFalse(InputValidator::isCurrency("eur"));
     $this->assertFalse(InputValidator::isCurrency("NotValid"));
     $this->assertFalse(InputValidator::isCurrency("nv"));
     $this->assertTrue(InputValidator::isCurrency("EUR"));
 }