Avoid code repetition in test

Co-authored-by: Gonzalo <gonzaponte@gmail.com>

invisible_cities/database/load_db_test.py

@@ -193,23 +193,15 @@ def test_RadioactivityData_max_version():
 
     conn = sqlite3.connect(DB.get_db(db_file))
 
-    # test Activity table
-    query = '''SELECT * FROM Activity
-               WHERE G4Volume = '{0}' AND Isotope = '{1}'
-            '''
-    for (g4volume, isotope), req in activity.groupby(["G4Volume", "Isotope"]):
-        all_versions = pd.read_sql_query(query.format(g4volume, isotope), conn)
-        max_version = all_versions[all_versions.Version == all_versions.Version.max()]
-        np.testing.assert_allclose(req.TotalActivity, max_version.TotalActivity)
-
-    # test Efficiency table
-    query = '''SELECT * FROM Efficiency
-               WHERE G4Volume = '{0}' AND Isotope = '{1}'
-            '''
-    for (g4volume, isotope), req in efficiency.groupby(["G4Volume", "Isotope"]):
-        all_versions = pd.read_sql_query(query.format(g4volume, isotope), conn)
-        max_version = all_versions[all_versions.Version == all_versions.Version.max()]
-        np.testing.assert_allclose(req.MCEfficiency, max_version.MCEfficiency)
+    for table, table_name, column in zip((      activity ,    efficiency ),
+                                         (     "Activity",   "Efficiency"),
+                                         ("TotalActivity", "MCEfficiency")):
+
+        query = "SELECT * FROM {0} WHERE G4Volume = '{1}' AND Isotope = '{2}'"
+        for (g4volume, isotope), req in table.groupby(["G4Volume", "Isotope"]):
+            all_versions = pd.read_sql_query(query.format(table_name, g4volume, isotope), conn)
+            max_version = all_versions[all_versions.Version == all_versions.Version.max()]
+            np.testing.assert_allclose(req[column], max_version[column])
 
 
 @mark.parametrize("version", (0, 1, 2))