public void ThrowArgumentException_WhenMaximumIDReached()
{ // Arrange
uint startId = 1;
uint endId = 2;
var provider = new IdProvider(startId, endId);
uint firstAvailabeId = provider.GenerateID();
uint secondAvailableId = provider.GenerateID();
// No available IDs should left
// Act and Assert
Assert.ThrowsException <InvalidOperationException>(() => provider.GenerateID());
}
public void IncrementIDsByOne_WhenInvoked()
{ // Arrange
uint expected = 1U;
uint startId = 2;
uint endId = 10;
var provider = new IdProvider(startId, endId);
// Act
uint firstId = provider.GenerateID();
uint nextId = provider.GenerateID();
// Assert
Assert.AreEqual(expected, nextId - firstId);
}