Add test to check for memory leaks

Author: lshaw8317

tests/ndarray/test_resize.py

@@ -60,3 +60,18 @@ def test_expand_dims(shape, axis, chunks, blocks, fill_value):
     a = blosc2.expand_dims(a, axis=axis)  # could lose ref to original array and thus dealloc data
     npa = np.expand_dims(npa, axis)
     assert a[()].shape == npa[()].shape  # getitem fails if deallocate has happened
+
+    # Now check that garbage collecting works and there will be no memory leaks for views
+    import sys
+
+    arr = np.arange(4)
+    bloscarr_ = blosc2.asarray(arr)
+    assert sys.getrefcount(arr) == sys.getrefcount(bloscarr_)  # = 2
+
+    view = np.expand_dims(arr, 0)
+    bloscview = blosc2.expand_dims(bloscarr_, 0)
+    assert sys.getrefcount(arr) == sys.getrefcount(bloscarr_)  # = 3
+
+    del view
+    del bloscview
+    assert sys.getrefcount(arr) == sys.getrefcount(bloscarr_)  # = 2