public void ExtractingFirstInteger()
{
Assert.AreEqual(0, AddressParser.ExtractBeginingOfStringAsInteger(null));
Assert.AreEqual(0, AddressParser.ExtractBeginingOfStringAsInteger(""));
Assert.AreEqual(1, AddressParser.ExtractBeginingOfStringAsInteger("1"));
Assert.AreEqual(123, AddressParser.ExtractBeginingOfStringAsInteger("123"));
Assert.AreEqual(123, AddressParser.ExtractBeginingOfStringAsInteger("123-1"));
Assert.AreEqual(123, AddressParser.ExtractBeginingOfStringAsInteger(" 123"));
}