added test

Author: flexatone

test/test_block_index.py

@@ -794,3 +794,9 @@ def test_block_index_iter_contiguous_h2(self) -> None:
                 (0, 2),
                 (1, 1)])
 
+
+    def test_block_index_iter_contiguous_i(self) -> None:
+        bi1 = BlockIndex()
+        bi1.register(np.arange(6).reshape(2,3))
+        bi1.register(np.arange(6).reshape(2,3))
+