Normalize whitespace in test arguments

We have a bunch of different styles of handling when function
definitions span multiple lines, which they almost always do with tests.

Here’s why an argument per line, single indent is best:
- cleaner diffs when you change the name of a method (one line change
  instead of multiple lines)
- works better on narrow screens, eg Github’s diff view, or with two
  terminals side by side on a laptop screen
- works with any editor’s indenting shortcuts, no need for an IDE

Also, trailing comma in the list of arguments is good because adding a
new argument to a method becomes a one line, not two line diff.

tests/app/main/views/test_platform_admin.py

@@ -10,7 +10,9 @@ from tests import service_json
 from app.main.views.platform_admin import format_stats_by_service, create_global_stats
 
 
-def test_should_redirect_if_not_logged_in(app_):
+def test_should_redirect_if_not_logged_in(
+    app_
+):
     with app_.test_request_context():
         with app_.test_client() as client:
             response = client.get(url_for('main.platform_admin'))
@@ -18,7 +20,11 @@ def test_should_redirect_if_not_logged_in(app_):
             assert url_for('main.index', _external=True) in response.location
 
 
-def test_should_403_if_not_platform_admin(app_, active_user_with_permissions, mocker):
+def test_should_403_if_not_platform_admin(
+    app_,
+    active_user_with_permissions,
+    mocker,
+):
     with app_.test_request_context():
         with app_.test_client() as client:
             mock_get_user(mocker, user=active_user_with_permissions)
@@ -44,7 +50,7 @@ def test_should_show_research_and_restricted_mode(
     platform_admin_user,
     mocker,
     mock_get_detailed_services,
-    fake_uuid
+    fake_uuid,
 ):
     services = [service_json(fake_uuid, 'My Service', [], restricted=restricted, research_mode=research_mode)]
     services[0]['statistics'] = create_stats()
@@ -95,7 +101,7 @@ def test_platform_admin_toggle_including_from_test_key(
     app_,
     platform_admin_user,
     mocker,
-    mock_get_detailed_services
+    mock_get_detailed_services,
 ):
     with app_.test_request_context():
         with app_.test_client() as client:
@@ -111,7 +117,7 @@ def test_platform_admin_with_date_filter(
     app_,
     platform_admin_user,
     mocker,
-    mock_get_detailed_services
+    mock_get_detailed_services,
 ):
     with app_.test_request_context():
         with app_.test_client() as client:
@@ -124,10 +130,12 @@ def test_platform_admin_with_date_filter(
     assert 'Platform admin' in resp_data
     assert 'Live services' in resp_data
     assert 'Trial mode services' in resp_data
-    mock_get_detailed_services.assert_called_once_with({'include_from_test_key': False,
-                                                        'start_date': datetime.date(2016, 12, 20),
-                                                        'end_date': datetime.date(2016, 12, 28),
-                                                        'detailed': True})
+    mock_get_detailed_services.assert_called_once_with({
+        'include_from_test_key': False,
+        'start_date': datetime.date(2016, 12, 20),
+        'end_date': datetime.date(2016, 12, 28),
+        'detailed': True,
+    })
 
 
 def test_create_global_stats_sets_failure_rates(fake_uuid):
@@ -220,7 +228,7 @@ def test_should_show_email_and_sms_stats_for_all_service_types(
     platform_admin_user,
     mocker,
     mock_get_detailed_services,
-    fake_uuid
+    fake_uuid,
 ):
     services = [service_json(fake_uuid, 'My Service', [], restricted=restricted, research_mode=research_mode)]
     services[0]['statistics'] = create_stats(
@@ -268,7 +276,7 @@ def test_should_show_archived_services_last(
     mocker,
     mock_get_detailed_services,
     restricted,
-    table_index
+    table_index,
 ):
     services = [
         service_json(name='C', restricted=restricted, active=False, created_at='2002-02-02 12:00:00'),
@@ -302,7 +310,7 @@ def test_shows_archived_label_instead_of_live_or_research_mode_label(
     platform_admin_user,
     mocker,
     mock_get_detailed_services,
-    research_mode
+    research_mode,
 ):
     services = [
         service_json(restricted=False, research_mode=research_mode, active=False)
@@ -328,7 +336,7 @@ def test_should_show_correct_sent_totals_for_platform_admin(
     platform_admin_user,
     mocker,
     mock_get_detailed_services,
-    fake_uuid
+    fake_uuid,
 ):
     services = [service_json(fake_uuid, 'My Service', [])]
     services[0]['statistics'] = create_stats(