case EXPECT_TUPLE:
Assert.assertTrue("Expected tuple", block instanceof Tuple);
Tuple tuple = (Tuple) block;
for (int i = 0; i < mColumns.length; i++)
{
ComparableTuple current = new ComparableTuple(tuple, mColumns);
if (mPrevious != null)
{
Assert.assertTrue(mPrevious.compareTo(current) <= 0);
}
mPrevious = current;