Add a test for the ToPyArray impl for ArrayBase.

Author: adamreichold

tests/to_py.rs

@@ -192,3 +192,33 @@ fn to_pyarray_object_vec() {
         }
     })
 }
+
+#[test]
+fn to_pyarray_object_array() {
+    use ndarray::Array2;
+    use pyo3::{
+        types::{PyDict, PyString},
+        ToPyObject,
+    };
+    use std::cmp::Ordering;
+
+    pyo3::Python::with_gil(|py| {
+        let mut nd_arr = Array2::from_shape_fn((2, 3), |(_, _)| py.None());
+        nd_arr[(0, 2)] = PyDict::new(py).to_object(py);
+        nd_arr[(1, 0)] = PyString::new(py, "Hello:)").to_object(py);
+
+        let py_arr = nd_arr.to_pyarray(py).readonly();
+
+        for (a, b) in nd_arr
+            .as_slice()
+            .unwrap()
+            .iter()
+            .zip(py_arr.as_slice().unwrap().iter())
+        {
+            assert_eq!(
+                a.as_ref(py).compare(b).map_err(|e| e.print(py)).unwrap(),
+                Ordering::Equal
+            );
+        }
+    })
+}