public void NextIdTest()
{
Heaters h = new Heaters();
Assert.AreEqual(Heaters.LastId, "aa");
Assert.AreEqual(Heaters.NextId(), "ab");
}
public void AddHeaterTest()
{
Heaters h = new Heaters();
h.AddHeater(new Heater(Heaters.NextId(), "a", "a"));
Assert.AreEqual(Heaters.LastId, "ab");
h.AddHeater(new Heater("ac", "a", "a"));
Assert.AreEqual(Heaters.LastId, "ac");
h.AddHeater(new Heater("ab", "a", "a"));
Assert.AreEqual(Heaters.LastId, "ac");
h.AddHeater(new Heater("ba", "a", "a"));
Assert.AreEqual(Heaters.LastId, "ba");
h.AddHeater(new Heater("bc", "a", "a"));
Assert.AreEqual(Heaters.LastId, "bc");
}