public void InsertOperation_CreateInverse_CreatesDeleteOperation()
{
var state = new DocumentState(1, "123456789");
var insert = new InsertOperation(state, 2, 'x');
Assert.IsInstanceOfType(insert.CreateInverse(state), typeof(DeleteOperation));
}
public void InsertOperation_CreateInverse_InverseUndoesInsert()
{
var state = new DocumentState(1, "123456789");
var insert = new InsertOperation(state, 2, 'x');
var insertedstate = insert.ApplyTransform(state.CurrentState);
Assert.AreEqual(state.CurrentState, insert.CreateInverse(state).ApplyTransform(insertedstate));
}