Add unit tests for dashboard template functions

Although we integration test the pages that depend on these, it’s
probably a good idea to unit test them as well, to make sure, for
example, that all the different statuses are counted when working out
how many messages have been sent from a template.

tests/app/main/views/test_dashboard.py

@@ -12,6 +12,8 @@ from app.main.views.dashboard import (
     format_monthly_stats_to_list,
     get_free_paid_breakdown_for_billable_units,
     aggregate_status_types,
+    format_template_stats_to_list,
+    get_tuples_of_financial_years,
 )
 
 from tests import validate_route_permission
@@ -613,3 +615,61 @@ def test_get_free_paid_breakdown_for_billable_units(now, expected_number_of_mont
             {'name': 'February', 'free': 0, 'paid': 1234},
             {'name': 'March', 'free': 0, 'paid': 0}
         ][:expected_number_of_months]
+
+
+def test_format_template_stats_to_list_with_no_stats():
+    assert list(format_template_stats_to_list({})) == []
+
+
+def test_format_template_stats_to_list():
+    counts = {
+        'created': 1,
+        'pending': 1,
+        'delivered': 1,
+        'failed': 1,
+        'temporary-failure': 1,
+        'permanent-failure': 1,
+        'technical-failure': 1,
+        'do-not-count': 999,
+    }
+    stats_list = list(format_template_stats_to_list({
+        'template_2_id': {
+            'counts': {},
+            'name': 'bar',
+        },
+        'template_1_id': {
+            'counts': counts,
+            'name': 'foo',
+        },
+    }))
+
+    # we don’t care about the order of this function’s output
+    assert len(stats_list) == 2
+    assert {
+        'counts': counts,
+        'name': 'foo',
+        'requested_count': 7,
+    } in stats_list
+    assert {
+        'counts': {},
+        'name': 'bar',
+        'requested_count': 0,
+    } in stats_list
+
+
+def test_get_tuples_of_financial_years():
+    assert list(get_tuples_of_financial_years(
+        lambda year: 'http://example.com?year={}'.format(year),
+        start=2040,
+        end=2041,
+    )) == [
+        ('financial year', 2040, 'http://example.com?year=2040', '2040 to 2041'),
+        ('financial year', 2041, 'http://example.com?year=2041', '2041 to 2042'),
+    ]
+
+
+def test_get_tuples_of_financial_years_defaults_to_2015():
+    assert 2015 in list(get_tuples_of_financial_years(
+        lambda year: 'http://example.com?year={}'.format(year),
+        end=2040,
+    ))[0]