public void Test_CompanyEquatable()
{
var c1 = new CompanyModel(1, "A", "B", "C", "Firma #1", "UID #1");
var c2Isc1 = new CompanyModel(1, "A", "B", "C", "Firma #1", "UID #1");
var c3 = new CompanyModel(9, "Street X", "Street Y", "Street Z", "Firma #2", "UID #2");
Assert.IsTrue(c1.Equals(c2Isc1));
Assert.AreEqual(c1, c1);
Assert.AreEqual(c1, c2Isc1);
Assert.AreNotEqual(c1, c3);
}