public void SampleTests_Valid()
 {
     Assert.AreEqual(1, HowManyUrinalsFree.GetFreeUrinals("10001"));
     Assert.AreEqual(0, HowManyUrinalsFree.GetFreeUrinals("1001"));
     Assert.AreEqual(3, HowManyUrinalsFree.GetFreeUrinals("00000"));
     Assert.AreEqual(2, HowManyUrinalsFree.GetFreeUrinals("0000"));
     Assert.AreEqual(1, HowManyUrinalsFree.GetFreeUrinals("01000"));
     Assert.AreEqual(2, HowManyUrinalsFree.GetFreeUrinals("10000"));
     Assert.AreEqual(0, HowManyUrinalsFree.GetFreeUrinals("1"));
     Assert.AreEqual(1, HowManyUrinalsFree.GetFreeUrinals("0"));
     Assert.AreEqual(0, HowManyUrinalsFree.GetFreeUrinals("10"));
 }
 public void SampleTestsWrong()
 {
     Assert.AreEqual(-1, HowManyUrinalsFree.GetFreeUrinals("110"));
     Assert.AreEqual(-1, HowManyUrinalsFree.GetFreeUrinals("101100001"));
 }