+ assert users.size == 2, 'Expected two objects in the preloaded hash'
+ assert users[uuid1], 'Expected user object for the passed in uuid'
+ assert users[uuid2], 'Expected user object for the passed in uuid'
+
+ # invoke again for this same input. this time, the preloaded data will be returned
+ users = ac.send :preload_objects_for_dataclass, dataclass, uuids
+ assert users, 'Expected objects'
+ assert users.is_a?(Hash), 'Expected a hash'
+ assert users.size == 2, 'Expected two objects in the preloaded hash'
+
+ # invoke again for this with one more uuid
+ uuids << api_fixture('jobs')['foobar']['uuid']
+ users = ac.send :preload_objects_for_dataclass, dataclass, uuids
+ assert users, 'Expected objects'
+ assert users.is_a?(Hash), 'Expected a hash'
+ assert users.size == 3, 'Expected two objects in the preloaded hash'
+ end
+
+ test "requesting a nonexistent object returns 404" do
+ # We're really testing ApplicationController's find_object_by_uuid.
+ # It's easiest to do that by instantiating a concrete controller.
+ @controller = NodesController.new
+ get(:show, {id: "zzzzz-zzzzz-zzzzzzzzzzzzzzz"}, session_for(:admin))
+ assert_response 404
+ end
+
+ test "Workbench returns 4xx when API server is unreachable" do
+ # We're really testing ApplicationController's render_exception.
+ # Our primary concern is that it doesn't raise an error and
+ # return 500.
+ orig_api_server = Rails.configuration.arvados_v1_base
+ begin
+ # The URL should look valid in all respects, and avoid talking over a
+ # network. 100::/64 is the IPv6 discard prefix, so it's perfect.
+ Rails.configuration.arvados_v1_base = "https://[100::f]:1/"
+ @controller = NodesController.new
+ get(:index, {}, session_for(:active))
+ assert_includes(405..422, @response.code.to_i,
+ "bad response code when API server is unreachable")
+ ensure
+ Rails.configuration.arvados_v1_base = orig_api_server
+ end