public void TestEquals()
{
State?state = new State(null, null, "");
Assert.NotNull(state);
state = new OperationAppendText("9").Apply(state.Value);
Assert.NotNull(state);
Assert.Null(state?.Accumulator);
state = new OperationCalcAdd().Apply(state.Value);
Assert.NotNull(state);
Assert.Equal(9, state?.Accumulator);
state = new OperationAppendText("9").Apply(state.Value);
Assert.NotNull(state);
Assert.Equal("9", state?.Text);
state = new OperationCalcEquals().Apply(state.Value);
Assert.NotNull(state);
Assert.Equal("18", state?.Text);
state = new OperationCalcEquals().Apply(state.Value);
Assert.NotNull(state);
Assert.Equal("27", state?.Text);
state = new OperationCalcEquals().Apply(state.Value);
Assert.NotNull(state);
Assert.Equal("36", state?.Text);
state = new OperationCalcEquals().Apply(state.Value);
Assert.NotNull(state);
Assert.Equal("45", state?.Text);
}
public void TestAppendText()
{
State?state = new State(0, null, "");
Assert.NotNull(state);
Assert.Equal(0, state?.Text.Length);
IOperation op = new OperationAppendText("-");
state = op.Apply(state.Value);
Assert.Equal(1, state?.Text.Length);
Assert.Equal("-", state?.Text);
}
