fix asserts

Author: meiravgri

tests/benchmark/bm_vecsim_basics.h

@@ -303,8 +303,6 @@ void BM_VecSimBasics<index_type_t>::UpdateAtBlockSize(benchmark::State &st) {
     // Calculate vectors needed to reach next block boundary
     size_t vecs_to_blocksize =
         BM_VecSimGeneral::block_size - (initial_index_size % BM_VecSimGeneral::block_size);
-    size_t initial_index_cap = index->indexMetaDataCapacity();
-    assert(initial_index_cap == N_VECTORS + vecs_to_blocksize);
 
     assert(vecs_to_blocksize < BM_VecSimGeneral::block_size);
     labelType initial_label_count = index->indexLabelCount();
@@ -332,7 +330,7 @@ void BM_VecSimBasics<index_type_t>::UpdateAtBlockSize(benchmark::State &st) {
     labelType label_to_update = curr_label - 1;
     size_t index_cap = index->indexMetaDataCapacity();
     std::cout << "index_cap after adding vectors " << index_cap << std::endl;
-    assert(index_cap == initial_index_cap + BM_VecSimGeneral::block_size);
+    assert(index_cap == initial_index_size + vecs_to_blocksize + BM_VecSimGeneral::block_size);
 
     for (auto _ : st) {
         // Remove the vector directly from hnsw