TEST: Suppress new numpy warning on nan-to-int cast

Author: effigies

nibabel/tests/test_volumeutils.py

@@ -692,7 +692,11 @@ def test_a2f_nan2zero_range():
             write_return(arr_no_nan, fobj, np.int8, intercept=129)
         # OK with nan2zero false, but we get whatever nan casts to
         with pytest.warns(warn_type) if warn_type else error_warnings():
-            nan_cast = np.array(np.nan, dtype=dt).astype(np.int8)
+            # XXX NP1.24
+            # Casting nan to int will produce a RuntimeWarning in numpy 1.24
+            # Change to expecting this warning when this becomes our minimum
+            with np.errstate(invalid='ignore'):
+                nan_cast = np.array(np.nan, dtype=dt).astype(np.int8)
         with pytest.warns(warn_type) if warn_type else error_warnings():
             back_arr = write_return(arr, fobj, np.int8, intercept=129, nan2zero=False)
         assert_array_equal([-128, -128, -128, nan_cast], back_arr)