Make the test more challenging: on every other step, read a chunk-sized

region offset by 1 unit from a chunk boundary.

1 files changed, 8 insertions, 4 deletions

diff --git a/test/vfd_swmr_bigset_writer.c b/test/vfd_swmr_bigset_writer.c
index 2a2718c..859393b 100644
--- a/test/vfd_swmr_bigset_writer.c
+++ b/test/vfd_swmr_bigset_writer.c
@@ -524,26 +524,30 @@ verify_extensible_dset(state_t *s, unsigned int which, mat_t *mat,
     last_step = nrows - hang_back;
 
     for (step = *stepp; step <= last_step; step++) {
+        const unsigned ofs = step % 2;
+
         dbgf(1, "%s: which %u step %u\n", __func__, which, step);
 
         size[0] = s->chunk_dims[0] * (1 + step);
-        last.row = s->chunk_dims[0] * step;
+        last.row = s->chunk_dims[0] * step + ofs;
 
         if (s->two_dee) {
             size[1] = s->chunk_dims[1] * (1 + step);
-            last.col = s->chunk_dims[1] * step;
+            last.col = s->chunk_dims[1] * step + ofs;
         } else {
             size[1] = s->chunk_dims[1];
             last.col = 0;
         }
 
         dbgf(1, "new size %" PRIuHSIZE ", %" PRIuHSIZE "\n", size[0], size[1]);
+        dbgf(1, "last row %" PRIuHSIZE " col %" PRIuHSIZE "\n", last.row,
+            last.col);
 
         if (s->two_dee) {
 
             /* Down the right side, intersecting the bottom row. */
             base.col = last.col;
-            for (base.row = 0; base.row <= last.row;
+            for (base.row = ofs; base.row <= last.row;
                  base.row += s->chunk_dims[0]) {
                 verify_chunk(s, filespace, mat, which, base);
             }
@@ -552,7 +556,7 @@ verify_extensible_dset(state_t *s, unsigned int which, mat_t *mat,
              * avoid re-writing the bottom-right chunk.
              */
             base.row = last.row;
-            for (base.col = 0; base.col < last.col;
+            for (base.col = ofs; base.col < last.col;
                  base.col += s->chunk_dims[1]) {
                 verify_chunk(s, filespace, mat, which, base);
             }