public void Iterators_Projection_SwapsEntries()
{
var rows = new object[, ]
{
{ 1, "One" },
{ 2, "Two" }
};
var expected = new object[, ]
{
{ "One", 1 },
{ "Two", 2 }
};
using (var input = new MockedIterator(rows))
{
var entries = new[]
{
new RowBufferEntry(input.RowBuffer, 1),
new RowBufferEntry(input.RowBuffer, 0)
};
using (var iterator = new ProjectionIterator(input, entries))
{
AssertProduces(iterator, expected);
}
}
}
public void Iterators_Projection_ForwardsProperly()
{
var rows = new object[] { 1, 2 };
var expected = rows;
using (var input = new MockedIterator(rows))
{
var entries = new[]
{
new RowBufferEntry(input.RowBuffer, 0)
};
using (var iterator = new ProjectionIterator(input, entries))
{
for (var i = 0; i < 2; i++)
{
AssertProduces(iterator, expected);
}
}
Assert.Equal(2, input.TotalOpenCount);
Assert.Equal(4, input.TotalReadCount);
Assert.Equal(1, input.DisposalCount);
}
}
public void Iterators_Projection_ReturnsEmpty_IfInputEmpty()
{
var rows = new object[0];
using (var input = new MockedIterator(rows))
using (var iterator = new ProjectionIterator(input, Enumerable.Empty <RowBufferEntry>()))
{
AssertEmpty(iterator);
}
}