public void Sim_IsCall()
{
// Arrange / Act
IOutput output = new OutputMock();
ISimCard simcard = new Sim(output);
simcard.Call(output);
var expectedString = "Sim call";
var myOutput = output.Output.ToString();
//Assert
Assert.AreNotEqual(expectedString, myOutput);
Assert.IsTrue(myOutput.Contains(expectedString));
}