Fix floating point round tripping

The schema is f32, so we have to use that in the test data to make it
round trip.
The assert in the test itself needs to be exact equality.

tests/test_packageAlerts.py

@@ -123,14 +123,16 @@ def mock_alert(alert_id):
             "band": 'g',
             "ra": 12.5,
             "dec": -16.9,
-            "x": 15.7,
-            "y": 89.8,
-            "apFlux": 54.85,
-            "apFluxErr": 70.0,
-            "snr": 6.7,
-            "psfFlux": 700.0,
-            "psfFluxErr": 90.0,
-            "flags": 0,
+            # These types are 32-bit floats in the avro schema, so we have to
+            # make them that type here, so that they round trip appropriately.
+            "x": np.float32(15.7),
+            "y": np.float32(89.8),
+            "apFlux": np.float32(54.85),
+            "apFluxErr": np.float32(70.0),
+            "snr": np.float32(6.7),
+            "psfFlux": np.float32(700.0),
+            "psfFluxErr": np.float32(90.0),
+            "flags": 12345,
         }
     }
 
@@ -527,8 +529,9 @@ def testRun_without_produce_or_write(self):
                               self.exposure,
                               self.exposure)
 
-    def test_serialize_alert_round_trip(self, **kwargs):
-
+    def test_serialize_alert_round_trip(self):
+        """Test that values in the alert packet exactly round trip.
+        """
         ConfigClass = PackageAlertsConfig()
         packageAlerts = PackageAlertsTask(config=ConfigClass)
 
@@ -537,7 +540,7 @@ def test_serialize_alert_round_trip(self, **kwargs):
         deserialized = PackageAlertsTask._deserialize_alert(packageAlerts, serialized)
 
         for field in alert['diaSource']:
-            self.assertAlmostEqual(alert['diaSource'][field], deserialized['diaSource'][field], places=5)
+            self.assertEqual(alert['diaSource'][field], deserialized['diaSource'][field])
         self.assertEqual(1, deserialized["alertId"])