public void Should_manage_transactions_4()
{
var stack = new StackWithTransactions <int>();
stack.Push(2);
stack.Push(4);
stack.Push(9);
stack.Begin();
stack.Push(6);
stack.Push(5);
Assert.True(stack.Commit());
Assert.False(stack.Rollback());
Assert.Equal(5, stack.Top());
stack.Begin();
stack.Push(4);
stack.Push(3);
stack.Begin();
stack.Push(2);
stack.Push(1);
Assert.Equal(1, stack.Top());
stack.Pop();
Assert.Equal(2, stack.Top());
Assert.True(stack.Rollback());
Assert.Equal(3, stack.Top());
Assert.True(stack.Commit());
stack.Pop();
Assert.Equal(4, stack.Top());
Assert.False(stack.Commit());
}
public void Should_return_false_when_rollbacking_empty_stack()
{
var stack = new StackWithTransactions <int>();
Assert.False(stack.Rollback());
Assert.False(stack.Rollback());
Assert.False(stack.Rollback());
Assert.False(stack.Rollback());
Assert.False(stack.Rollback());
}
public void Should_manage_embedded_transactions()
{
var stack = new StackWithTransactions <int>();
stack.Push(4);
stack.Begin(); // start transaction 1
stack.Push(7); // stack: [4,7]
stack.Begin(); // start transaction 2
stack.Push(2); // stack: [4,7,2]
Assert.True(stack.Rollback()); // rollback transaction 2
Assert.Equal(7, stack.Top()); // stack: [4,7]
stack.Begin(); // start transaction 3
stack.Push(10); // stack: [4,7,10]
Assert.True(stack.Commit()); // transaction 3 is committed
Assert.Equal(10, stack.Top());
Assert.True(stack.Rollback()); // rollback transaction 1
Assert.Equal(4, stack.Top()); // stack: [4]
Assert.False(stack.Commit()); // there is no open transaction
}
public void Should_manage_transactions_with_begin_rollback_and_commit()
{
var stack = new StackWithTransactions <int>();
stack.Begin();
stack.Push(1);
stack.Push(2); // stack [1, 2]
Assert.Equal(2, stack.Top());
Assert.True(stack.Rollback()); // stack []
Assert.Equal(0, stack.Top());
stack.Push(1);
stack.Begin();
stack.Push(1);
stack.Push(2); // stack [1, 1,2]
Assert.Equal(2, stack.Top());
stack.Pop(); // stack [1, 1]
Assert.Equal(1, stack.Top());
stack.Push(5); // stack [1,1,5]
Assert.Equal(5, stack.Top());
Assert.True(stack.Commit()); // stack [1,1, 5]
Assert.Equal(5, stack.Top());
Assert.False(stack.Rollback()); // no transaction
Assert.Equal(5, stack.Top());
stack.Pop();
Assert.Equal(1, stack.Top());
stack.Pop();
Assert.Equal(1, stack.Top());
stack.Pop();
Assert.Equal(0, stack.Top());
stack.Pop();
Assert.Equal(0, stack.Top());
}