diff --git a/tests/util/test_radar_utils.py b/tests/util/test_radar_utils.py
index 442b2cc0ab..eefff844e0 100644
--- a/tests/util/test_radar_utils.py
+++ b/tests/util/test_radar_utils.py
@@ -50,6 +50,24 @@ def test_to_vpt():
     assert len(radar.instrument_parameters["prt_mode"]["data"]) == 108
 
 
+def test_determine_sweeps():
+    # ppi
+    radar = pyart.testing.make_empty_ppi_radar(10, 36, 3)
+    radar.elevation['data'] = radar.elevation['data'] * np.ceil(np.arange(1, 36*3 + 1) / 36)
+    pyart.util.determine_sweeps(radar)
+    assert np.all(radar.sweep_end_ray_index['data'] == [35, 71, 107])
+    assert np.all(radar.sweep_start_ray_index['data'] == [0, 36, 72])
+    assert len(radar.sweep_number['data']) == 3
+
+    # rhi
+    radar = pyart.testing.make_empty_rhi_radar(10, 25, 5)
+    radar.azimuth['data'] = radar.azimuth['data'] * np.ceil(np.arange(1, 25*5 + 1) / 25) * 25
+    pyart.util.determine_sweeps(radar)
+    assert np.all(radar.sweep_end_ray_index['data'] == [ 24,  49,  74,  99, 124])
+    assert np.all(radar.sweep_start_ray_index['data'] == [  0,  25,  50,  75, 100])
+    assert len(radar.sweep_number['data']) == 5
+
+
 def test_subset_radar():
     radar = pyart.testing.make_empty_ppi_radar(10, 36, 3)
     field = {"data": np.ones((36 * 3, 10))}