add pagination to inbox page

tests/app/main/views/test_conversation.py

@@ -196,13 +196,16 @@ def test_view_conversation_with_empty_inbound(
 ):
     mock_get_inbound_sms = mocker.patch(
         'app.main.views.conversation.service_api_client.get_inbound_sms',
-        return_value=[{
-            'user_number': '07900000001',
-            'notify_number': '07900000002',
-            'content': '',
-            'created_at': datetime.utcnow().isoformat(),
-            'id': fake_uuid
-        }]
+        return_value={
+            'has_next': False,
+            'data': [{
+                'user_number': '07900000001',
+                'notify_number': '07900000002',
+                'content': '',
+                'created_at': datetime.utcnow().isoformat(),
+                'id': fake_uuid
+            }]
+        }
     )
 
     page = client_request.get(

tests/app/main/views/test_dashboard.py

@@ -200,6 +200,27 @@ def test_inbox_showing_inbound_messages(
     )
 
 
+def test_get_inbound_sms_shows_page_links(
+    logged_in_client,
+    service_one,
+    mock_get_service_templates_when_no_templates_exist,
+    mock_get_jobs,
+    mock_get_detailed_service,
+    mock_get_template_statistics,
+    mock_get_usage,
+    mock_get_inbound_sms,
+    mock_get_inbound_number_for_service,
+):
+    service_one['permissions'] = ['inbound_sms']
+
+    response = logged_in_client.get(url_for('main.inbox', service_id=SERVICE_ONE_ID, page=2))
+
+    assert response.status_code == 200
+    page = BeautifulSoup(response.data.decode('utf-8'), 'html.parser')
+    assert 'Next page' in page.find('li', {'class': 'next-page'}).text
+    assert 'Previous page' in page.find('li', {'class': 'previous-page'}).text
+
+
 def test_empty_inbox(
     logged_in_client,
     service_one,
@@ -222,6 +243,8 @@ def test_empty_inbox(
         'When users text your service’s phone number (0781239871) you’ll see the messages here'
     )
     assert not page.select('a[download]')
+    assert not page.select('li.next-page')
+    assert not page.select('li.previous-page')
 
 
 @pytest.mark.parametrize('endpoint', [
@@ -333,13 +356,16 @@ def test_download_inbox_strips_formulae(
 
     mocker.patch(
         'app.service_api_client.get_inbound_sms',
-        return_value=[{
-            'user_number': 'elevenchars',
-            'notify_number': 'foo',
-            'content': message_content,
-            'created_at': datetime.utcnow().isoformat(),
-            'id': fake_uuid,
-        }],
+        return_value={
+            'has_next': False,
+            'data': [{
+                'user_number': 'elevenchars',
+                'notify_number': 'foo',
+                'content': message_content,
+                'created_at': datetime.utcnow().isoformat(),
+                'id': fake_uuid,
+            }]
+        },
     )
     response = logged_in_client.get(
         url_for('main.inbox_download', service_id=SERVICE_ONE_ID)