Add test coverage for configuration of autofocus

This commits adds test coverage for ther HTML in several of the forms
which had broken autofocus.

It means that if we make changes to the HTML which triggers autofocus in
the future it should be more obvious that something is depending on the
attributes being added/removed.

tests/app/main/views/test_manage_users.py

@@ -151,6 +151,49 @@ def test_should_show_overview_page(
     mock_get_users.assert_called_once_with(SERVICE_ONE_ID)
 
 
+@pytest.mark.parametrize('number_of_users', (
+    pytest.param(7, marks=pytest.mark.xfail),
+    pytest.param(8),
+))
+def test_should_show_live_search_if_more_than_7_users(
+    client_request,
+    mocker,
+    mock_get_invites_for_service,
+    mock_get_template_folders,
+    mock_has_no_jobs,
+    active_user_with_permissions,
+    active_user_view_permissions,
+    number_of_users,
+):
+    mocker.patch('app.user_api_client.get_user', return_value=active_user_with_permissions)
+    mocker.patch('app.models.user.InvitedUsers.client_method', return_value=[])
+    mocker.patch(
+        'app.models.user.Users.client_method',
+        return_value=[active_user_with_permissions] * number_of_users
+    )
+
+    page = client_request.get('main.manage_users', service_id=SERVICE_ONE_ID)
+
+    assert page.select_one('div[data-module=live-search]')['data-targets'] == (
+        ".user-list-item"
+    )
+    assert len(page.select('.user-list-item')) == number_of_users
+
+    textbox = page.select_one('[data-module=autofocus] .govuk-input')
+    assert 'value' not in textbox
+    assert textbox['name'] == 'search'
+    # data-module=autofocus is set on a containing element so it
+    # shouldn’t also be set on the textbox itself
+    assert 'data-module' not in textbox
+    assert not page.select_one('[data-force-focus]')
+    assert textbox['class'] == [
+        'govuk-input', 'govuk-!-width-full',
+    ]
+    assert normalize_spaces(
+        page.select_one('label[for=search]').text
+    ) == 'Search by name or email address'
+
+
 def test_should_show_caseworker_on_overview_page(
     client_request,
     mocker,