| // Copyright 2020 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| |
| package wire |
| |
| import ( |
| "sync/atomic" |
| "testing" |
| "time" |
| ) |
| |
| func TestPeriodicTask(t *testing.T) { |
| const pollInterval = 10 * time.Millisecond |
| var callCount int32 |
| values := make(chan int32) |
| task := func() { |
| values <- atomic.AddInt32(&callCount, 1) |
| } |
| ptask := newPeriodicTask(pollInterval, task) |
| defer ptask.Stop() |
| |
| t.Run("Start", func(t *testing.T) { |
| ptask.Start() |
| ptask.Start() // Tests duplicate start |
| |
| got := <-values |
| |
| // Attempt to immediately stop the task after the first run. |
| // Note: if this test is still flaky, pollInterval can be increased. |
| ptask.Stop() |
| |
| if want := int32(1); got != want { |
| t.Errorf("got %d, want %d", got, want) |
| } |
| }) |
| |
| t.Run("Stop", func(t *testing.T) { |
| ptask.Stop() // Tests duplicate stop (also called in Start above) |
| |
| // Wait at least the poll interval to ensure the task did not run. |
| time.Sleep(2 * pollInterval) |
| select { |
| case got := <-values: |
| t.Errorf("got unexpected value %d", got) |
| default: |
| } |
| }) |
| |
| t.Run("Restart", func(t *testing.T) { |
| ptask.Start() |
| |
| if got, want := <-values, int32(2); got != want { |
| t.Errorf("got %d, want %d", got, want) |
| } |
| }) |
| } |