public void Iterators_Top_ReturnsEmpty_IfInputIsEmpty()
{
var rows = new object[0];
using (var input = new MockedIterator(rows))
using (var iterator = new TopIterator(input, 1))
{
AssertEmpty(iterator);
}
}
public void Iterators_Top_ReturnsEmpty_IfLimitIsZero()
{
var rows = new object[] { 1 };
using (var input = new MockedIterator(rows))
using (var iterator = new TopIterator(input, 0))
{
AssertEmpty(iterator);
}
}
public void Iterators_Top_LimitsRows()
{
var rows = new object[] { 1, 2, 3 };
var expected = new object[] { 1, 2 };
var limit = expected.Length;
using (var input = new MockedIterator(rows))
using (var iterator = new TopIterator(input, limit))
{
AssertProduces(iterator, expected);
}
}
public void Iterators_Top_ReturnsAllRows_IfLimitIsLarger()
{
var rows = new object[] { 1, 2, 3 };
var expected = rows;
var limit = rows.Length + 1;
using (var input = new MockedIterator(rows))
using (var iterator = new TopIterator(input, limit))
{
AssertProduces(iterator, expected);
}
}
public void Iterators_Top_ForwardsProperly()
{
var rows = new object[] { 1, 2 };
var expected = new object[] { 1, 2 };
using (var input = new MockedIterator(rows))
{
using (var iterator = new TopIterator(input, int.MaxValue))
{
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);
}
}
