mirror of
https://github.com/tailscale/tailscale.git
synced 2025-07-31 08:13:44 +00:00
f2f1236ad4
Instead of every module having to come up with a set of test methods for the event bus, this handful of test helpers hides a lot of the needed setup for the testing of the event bus. The tests in portmapper is also ported over to the new helpers. Updates #15160 Signed-off-by: Claus Lensbøl <claus@tailscale.com>
46 lines
1.8 KiB
Go
46 lines
1.8 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
// Package eventbustest provides helper methods for testing an [eventbus.Bus].
|
|
//
|
|
// # Usage
|
|
//
|
|
// A [Watcher] presents a set of generic helpers for testing events.
|
|
//
|
|
// To test code that generates events, create a [Watcher] from the [eventbus.Bus]
|
|
// used by the code under test, run the code to generate events, then use the watcher
|
|
// to verify that the expected events were produced. In outline:
|
|
//
|
|
// bus := eventbustest.NewBus(t)
|
|
// tw := eventbustest.NewWatcher(t, bus)
|
|
// somethingThatEmitsSomeEvent()
|
|
// if err := eventbustest.Expect(tw, eventbustest.Type[EventFoo]()); err != nil {
|
|
// t.Error(err.Error())
|
|
// }
|
|
//
|
|
// As shown, [Expect] checks that at least one event of the given type occurs
|
|
// in the stream generated by the code under test.
|
|
//
|
|
// The following functions all take an any parameter representing a function.
|
|
// This function will take an argument of the expected type and is used to test
|
|
// for the events on the eventbus being of the given type. The function can
|
|
// take the shape described in [Expect].
|
|
//
|
|
// [Type] is a helper for only testing event type.
|
|
//
|
|
// To check for specific properties of an event, use [Expect], and pass a function
|
|
// as the second argument that tests for those properties.
|
|
//
|
|
// To test for multiple events, use [Expect], which checks that the stream
|
|
// contains the given events in the given order, possibly with other events
|
|
// interspersed.
|
|
//
|
|
// To test the complete contents of the stream, use [ExpectExactly], which
|
|
// checks that the stream contains exactly the given events in the given order,
|
|
// and no others.
|
|
//
|
|
// See the [usage examples].
|
|
//
|
|
// [usage examples]: https://github.com/tailscale/tailscale/blob/main/util/eventbus/eventbustest/examples_test.go
|
|
package eventbustest
|