add unit test for NullSkyModel

LSSTDESC · Jul 7, 2019 · e04e752 · e04e752
1 parent b3e9845
commit e04e752
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/tests/test_skyModel.py b/tests/test_skyModel.py
@@ -171,5 +171,18 @@ def test_skycounts_function(self):
         skycounts_persec_u = skycounts_persec('u', 24)
         self.assertAlmostEqual(skycounts_persec_u.value, self.zp_u)
 
+    def test_NullSkyModel(self):
+        """Test that the NullSkyModel adds zero photons."""
+        commands = copy.deepcopy(self.commands)
+        photParams = desc.imsim.photometricParameters(commands)
+        null_sky_model = desc.imsim.make_sky_model(self.obs_md, photParams,
+                                                   disable_sky_model=True)
+        nx, ny = 30, 30
+        image = galsim.Image(nx, ny)
+        image = null_sky_model.addNoiseAndBackground(image,
+                                                     photParams=photParams,
+                                                     detector=self.detector())
+        self.assertEqual(0, np.sum(image.array.ravel()))
+
 if __name__ == '__main__':
     unittest.main()