public void Iterators_DistinctSort_Sorts_TwoEntries()
{
var rows = new object[, ]
{
{ "Kirkland", "USA" },
{ "London", "UK" },
{ "London", null },
{ "Redmond", "USA" },
{ "Seattle", "USA" },
{ "London", "UK" },
{ "Seattle", "USA" },
{ "Tacoma", "USA" },
{ "London", "UK" },
{ null, "USA" },
{ null, null }
};
var expected = new object[, ]
{
{ null, null },
{ "London", null },
{ null, "USA" },
{ "Kirkland", "USA" },
{ "Redmond", "USA" },
{ "Seattle", "USA" },
{ "Tacoma", "USA" },
{ "London", "UK" }
};
using (var input = new MockedIterator(rows))
{
var sortEntries = new[]
{
new RowBufferEntry(input.RowBuffer, 1),
new RowBufferEntry(input.RowBuffer, 0)
};
var comparers = new[]
{
Comparer <string> .Create((x, y) => y.CompareTo(x)),
Comparer <string> .Create((x, y) => x.CompareTo(y))
};
using (var iterator = new DistinctSortIterator(input, sortEntries, comparers))
{
AssertProduces(iterator, expected);
}
}
}
public void Iterators_DistinctSort_ReturnsEmpty_IfInputIsEmpty()
{
var rows = new object[0];
using (var input = new MockedIterator(rows))
{
var sortEntries = new[] { new RowBufferEntry(input.RowBuffer, 0) };
var comparers = new[] { Comparer.Default };
using (var iterator = new DistinctSortIterator(input, sortEntries, comparers))
{
AssertEmpty(iterator);
}
}
}
public void Iterators_DistinctSort_Sorts_SingleEntry()
{
var rows = new object[] { null, 1, 2, 1 };
var expected = new object[] { null, 2, 1 };
using (var input = new MockedIterator(rows))
{
var sortEntries = new[]
{
new RowBufferEntry(input.RowBuffer, 0)
};
var comparers = new[]
{
Comparer <int> .Create((x, y) => y.CompareTo(x))
};
using (var iterator = new DistinctSortIterator(input, sortEntries, comparers))
{
AssertProduces(iterator, expected);
}
}
}
public void Iterators_DistinctSort_ForwardsProperly()
{
var rows = new object[] { 1, 2 };
var expected = rows;
using (var input = new MockedIterator(rows))
{
var sortEntries = new[] { new RowBufferEntry(input.RowBuffer, 0) };
var comparers = new[] { Comparer.Default };
using (var iterator = new DistinctSortIterator(input, sortEntries, comparers))
{
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);
}
}
