diff --git a/nac3standalone/demo/src/ndarray.py b/nac3standalone/demo/src/ndarray.py
index 16eec742c..353ebe5c6 100644
--- a/nac3standalone/demo/src/ndarray.py
+++ b/nac3standalone/demo/src/ndarray.py
@@ -9,12 +9,6 @@ def output_float64(x: float):
 def consume_ndarray_1(n: ndarray[float, Literal[1]]):
     pass
 
-def consume_ndarray_i32_1(n: ndarray[int32, Literal[1]]):
-    pass
-
-def consume_ndarray_2(n: ndarray[float, Literal[2]]):
-    pass
-
 def test_ndarray_ctor():
     n: ndarray[float, Literal[1]] = np_ndarray([1])
     consume_ndarray_1(n)
@@ -26,31 +20,29 @@ def test_ndarray_empty():
 def test_ndarray_zeros():
     n: ndarray[float, 1] = np_zeros([1])
     output_float64(n[0])
-    consume_ndarray_1(n)
 
 def test_ndarray_ones():
     n: ndarray[float, 1] = np_ones([1])
     output_float64(n[0])
-    consume_ndarray_1(n)
 
 def test_ndarray_full():
     n_float: ndarray[float, 1] = np_full([1], 2.0)
     output_float64(n_float[0])
-    consume_ndarray_1(n_float)
     n_i32: ndarray[int32, 1] = np_full([1], 2)
     output_int32(n_i32[0])
-    consume_ndarray_i32_1(n_i32)
 
 def test_ndarray_eye():
     n: ndarray[float, 2] = np_eye(2)
     n0: ndarray[float, 1] = n[0]
     v: float = n0[0]
     output_float64(v)
-    consume_ndarray_2(n)
 
 def test_ndarray_identity():
     n: ndarray[float, 2] = np_identity(2)
-    consume_ndarray_2(n)
+    output_float64(n[0][0])
+    output_float64(n[0][1])
+    output_float64(n[1][0])
+    output_float64(n[1][1])
 
 def test_ndarray_fill():
     n: ndarray[float, 2] = np_empty([2, 2])
@@ -60,6 +52,21 @@ def test_ndarray_fill():
     output_float64(n[1][0])
     output_float64(n[1][1])
 
+def test_ndarray_copy():
+    x: ndarray[float, 2] = np_identity(2)
+    y = x.copy()
+    x.fill(0.0)
+
+    output_float64(x[0][0])
+    output_float64(x[0][1])
+    output_float64(x[1][0])
+    output_float64(x[1][1])
+
+    output_float64(y[0][0])
+    output_float64(y[0][1])
+    output_float64(y[1][0])
+    output_float64(y[1][1])
+
 def run() -> int32:
     test_ndarray_ctor()
     test_ndarray_empty()
@@ -69,5 +76,6 @@ def run() -> int32:
     test_ndarray_eye()
     test_ndarray_identity()
     test_ndarray_fill()
+    test_ndarray_copy()
 
     return 0