diff --git a/tests/app/dao/notification_dao/test_notification_dao_performance_platform.py b/tests/app/dao/notification_dao/test_notification_dao_performance_platform.py
index dc11ac8e2..125223e2a 100644
--- a/tests/app/dao/notification_dao/test_notification_dao_performance_platform.py
+++ b/tests/app/dao/notification_dao/test_notification_dao_performance_platform.py
@@ -12,24 +12,17 @@ from tests.app.conftest import (
     sample_template
 )
 
-
-def test_get_total_notifications_filters_on_date(sample_template):
-    create_notification(sample_template, created_at=datetime(2016, 10, 17, 10, 0))
-    create_notification(sample_template, created_at=datetime(2016, 10, 18, 10, 0))
-    create_notification(sample_template, created_at=datetime(2016, 10, 19, 10, 0))
-
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
-
-    assert result.messages_total == 1
+BEGINNING_OF_DAY = date(2016, 10, 18)
+END_OF_DAY = date(2016, 10, 19)
 
 
-def test_get_total_notifications_filters_on_date_at_midnight(sample_template):
+def test_get_total_notifications_filters_on_date_within_date_range(sample_template):
     create_notification(sample_template, created_at=datetime(2016, 10, 17, 23, 59, 59))
-    create_notification(sample_template, created_at=datetime(2016, 10, 18, 0, 0))
+    create_notification(sample_template, created_at=BEGINNING_OF_DAY)
     create_notification(sample_template, created_at=datetime(2016, 10, 18, 23, 59, 59))
-    create_notification(sample_template, created_at=datetime(2016, 10, 19, 0, 0))
+    create_notification(sample_template, created_at=END_OF_DAY)
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 2
 
@@ -42,7 +35,7 @@ def test_get_total_notifications_only_counts_api_notifications(sample_template,
     create_notification(sample_template, job=sample_job)
     create_notification(sample_template, api_key=sample_api_key)
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 1
 
@@ -57,7 +50,7 @@ def test_get_total_notifications_ignores_test_keys(sample_template):
     create_notification(sample_template, key_type=KEY_TYPE_TEAM)
     create_notification(sample_template, key_type=KEY_TYPE_TEST)
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 4
 
@@ -76,7 +69,7 @@ def test_get_total_notifications_ignores_letters(
     create_notification(sample_email_template)
     create_notification(sample_letter_template)
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 4
 
@@ -89,7 +82,7 @@ def test_get_total_notifications_counts_messages_within_10_seconds(sample_templa
     create_notification(sample_template, sent_at=created_at + timedelta(seconds=10))
     create_notification(sample_template, sent_at=created_at + timedelta(seconds=15))
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 3
     assert result.messages_within_10_secs == 2
@@ -99,7 +92,7 @@ def test_get_total_notifications_counts_messages_within_10_seconds(sample_templa
 def test_get_total_notifications_counts_messages_that_have_not_sent(sample_template):
     create_notification(sample_template, status='created', sent_at=None)
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 1
     assert result.messages_within_10_secs == 0
@@ -107,7 +100,7 @@ def test_get_total_notifications_counts_messages_that_have_not_sent(sample_templ
 
 @freeze_time('2016-10-18T10:00')
 def test_get_total_notifications_returns_zero_if_no_data(notify_db_session):
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 0
     assert result.messages_within_10_secs == 0
@@ -136,7 +129,7 @@ def test_get_total_notifications_counts_ignores_research_mode(notify_db, notify_
         sent_at=created_at + timedelta(seconds=5)
     )
 
-    result = dao_get_total_notifications_sent_per_day_for_performance_platform(date(2016, 10, 18), date(2016, 10, 19))
+    result = dao_get_total_notifications_sent_per_day_for_performance_platform(BEGINNING_OF_DAY, END_OF_DAY)
 
     assert result.messages_total == 2
     assert result.messages_within_10_secs == 2