function test_alphanumeric_gen()
 {
     $rand = iclicker_service::randomAlphaNumeric(10);
     $this->assertNotNull($rand);
     $this->assertTrue(strlen($rand) == 10);
     $rand = iclicker_service::randomAlphaNumeric(12);
     $this->assertNotNull($rand);
     $this->assertTrue(strlen($rand) == 12);
 }
 function test_alphanumeric_gen()
 {
     $this->resetAfterTest(true);
     // reset all changes automatically after this test
     $rand = iclicker_service::randomAlphaNumeric(10);
     $this->assertNotNull($rand);
     $this->assertTrue(strlen($rand) == 10);
     $rand = iclicker_service::randomAlphaNumeric(12);
     $this->assertNotNull($rand);
     $this->assertTrue(strlen($rand) == 12);
 }