TEST: Verify writing to loaded data array fails

Author: effigies

nibabel/gifti/tests/test_parse_gifti_fast.py

@@ -268,6 +268,13 @@ def test_readwritedata():
         assert_array_almost_equal(img.darrays[0].data,
                                   img2.darrays[0].data)
 
+def test_modify_darray():
+    for fname in (DATA_FILE1, DATA_FILE2, DATA_FILE5):
+        img = load(fname)
+        darray = img.darrays[0]
+        darray.data[:] = 0
+        yield assert_array_almost_equal, darray.data, np.broadcast_to(0, darray.data.shape)
+
 
 def test_write_newmetadata():
     img = gi.GiftiImage()