Add downloadable report for org usage

This is so org level users can use this data easier for things
like determining spending per service.

We do not include sms fragments sent column and remove other sms columns

consistency.

Do not add sms fragments sent column for now until we agree on an
unambiguous name for it. The data in this column is sms billing units
multiplied by international sms weighing. My favourite for a clear
name would be 'text message credits used', but we need a naming
strategy for this.

tests/app/main/views/organisations/test_organisations.py

@@ -624,6 +624,7 @@ def test_organisation_services_hides_search_bar_for_7_or_fewer_services(
     assert not page.select_one('.live-search')
 
 
+@freeze_time("2021-11-12 11:09:00.061258")
 def test_organisation_services_links_to_downloadable_report(
     client_request,
     mock_get_organisation,
@@ -651,7 +652,62 @@ def test_organisation_services_links_to_downloadable_report(
     page = client_request.get('.organisation_dashboard', org_id=ORGANISATION_ID)
 
     link_to_report = page.find('a', text="Download this report")
-    assert link_to_report.attrs["href"] == url_for('.download_services_report_for_org', org_id=ORGANISATION_ID)
+    assert link_to_report.attrs["href"] == url_for(
+        '.download_organisation_usage_report',
+        org_id=ORGANISATION_ID,
+        selected_year=2021
+    )
+
+
+@freeze_time("2021-11-12 11:09:00.061258")
+def test_download_organisation_usage_report(
+    client_request,
+    mock_get_organisation,
+    mocker,
+    active_user_with_permissions,
+    fake_uuid,
+):
+    mocker.patch(
+        'app.organisations_client.get_services_and_usage',
+        return_value={"services": [
+            {
+                'service_id': SERVICE_ONE_ID,
+                'service_name': 'Service 1',
+                'chargeable_billable_sms': 22,
+                'emails_sent': 13000,
+                'free_sms_limit': 100,
+                'letter_cost': 30.50,
+                'sms_billable_units': 122,
+                'sms_cost': 1.93,
+                'sms_remainder': None
+            },
+            {
+                'service_id': SERVICE_TWO_ID,
+                'service_name': 'Service 1',
+                'chargeable_billable_sms': 222,
+                'emails_sent': 23000,
+                'free_sms_limit': 250000,
+                'letter_cost': 60.50,
+                'sms_billable_units': 322,
+                'sms_cost': 3.93,
+                'sms_remainder': None
+            },
+        ]}
+    )
+    client_request.login(active_user_with_permissions)
+    csv_report = client_request.get(
+        '.download_organisation_usage_report',
+        org_id=ORGANISATION_ID,
+        selected_year=2021,
+        _test_page_title=False
+    )
+
+    assert csv_report.string == (
+        "Service ID,Service Name,Emails sent,Free text message allowance remaining,"
+        "Spent on text messages (£),Spent on letters (£)"
+        "\r\n596364a0-858e-42c8-9062-a8fe822260eb,Service 1,13000,,1.93,30.5"
+        "\r\n147ad62a-2951-4fa1-9ca0-093cd1a52c52,Service 1,23000,,3.93,60.5\r\n"
+    )
 
 
 def test_organisation_trial_mode_services_shows_all_non_live_services(

tests/app/test_navigation.py

@@ -89,6 +89,7 @@ EXCLUDED_ENDPOINTS = tuple(map(Navigation.get_endpoint_with_blueprint, {
     'documentation',
     'download_contact_list',
     'download_notifications_csv',
+    'download_organisation_usage_report',
     'edit_and_format_messages',
     'edit_data_retention',
     'edit_organisation_agreement',