rok commented on code in PR #14378:
URL: https://github.com/apache/arrow/pull/14378#discussion_r994946834


##########
cpp/src/arrow/sparse_tensor_test.cc:
##########
@@ -1676,4 +1676,55 @@ TEST(TestSparseCSFMatrixForUInt64Index, Make) {
   ASSERT_RAISES(Invalid, SparseCSFTensor::Make(dense_tensor, uint64()));
 }
 
+//-----------------------------------------------------------------------------
+// Create SparseTensors from a dense Tensor with only zeros
+
+template <typename SparseTensorType>
+class TestSparseTensorFromDenseBase : public ::testing::Test {
+ public:
+  void SetUp() {
+    shape_ = {2, 12};
+    dim_names_ = {"foo", "bar"};
+    dense_values_ = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+    dense_data_ = Buffer::Wrap(dense_values_);
+  }
+
+ protected:
+  std::vector<int64_t> shape_;
+  std::vector<std::string> dim_names_;
+  std::vector<int64_t> dense_values_;
+  std::shared_ptr<Buffer> dense_data_;
+};
+
+template <typename SparseTensorType>
+class TestSparseTensorFromDense : public 
TestSparseTensorFromDenseBase<SparseTensorType> {
+};
+
+TYPED_TEST_SUITE_P(TestSparseTensorFromDense);
+
+TYPED_TEST_P(TestSparseTensorFromDense, TestNonZeroLength) {

Review Comment:
   Indeed. I changed the c++ test so that one dimension is now 0.



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