.config/coc/extensions/coc-go-data/tools/pkg/mod/golang.org/x/tools@v0.0.0-20201028153306-37f0764111ff/internal/lsp/debounce_test.go

   1 // Copyright 2020 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package lsp
   6
   7 import (
   8         "sync"
   9         "testing"
  10         "time"
  11 )
  12
  13 func TestDebouncer(t *testing.T) {
  14         t.Parallel()
  15         type event struct {
  16                 key       string
  17                 order     uint64
  18                 fired     bool
  19                 wantFired bool
  20         }
  21         tests := []struct {
  22                 label  string
  23                 events []*event
  24         }{
  25                 {
  26                         label: "overridden",
  27                         events: []*event{
  28                                 {key: "a", order: 1, wantFired: false},
  29                                 {key: "a", order: 2, wantFired: true},
  30                         },
  31                 },
  32                 {
  33                         label: "distinct labels",
  34                         events: []*event{
  35                                 {key: "a", order: 1, wantFired: true},
  36                                 {key: "b", order: 2, wantFired: true},
  37                         },
  38                 },
  39                 {
  40                         label: "reverse order",
  41                         events: []*event{
  42                                 {key: "a", order: 2, wantFired: true},
  43                                 {key: "a", order: 1, wantFired: false},
  44                         },
  45                 },
  46                 {
  47                         label: "multiple overrides",
  48                         events: []*event{
  49                                 {key: "a", order: 1, wantFired: false},
  50                                 {key: "a", order: 2, wantFired: false},
  51                                 {key: "a", order: 3, wantFired: false},
  52                                 {key: "a", order: 4, wantFired: false},
  53                                 {key: "a", order: 5, wantFired: true},
  54                         },
  55                 },
  56         }
  57         for _, test := range tests {
  58                 test := test
  59                 t.Run(test.label, func(t *testing.T) {
  60                         t.Parallel()
  61                         d := newDebouncer()
  62                         var wg sync.WaitGroup
  63                         for i, e := range test.events {
  64                                 wg.Add(1)
  65                                 go func(e *event) {
  66                                         d.debounce(e.key, e.order, 100*time.Millisecond, func() {
  67                                                 e.fired = true
  68                                         })
  69                                         wg.Done()
  70                                 }(e)
  71                                 // For a bit more fidelity, sleep to try to make things actually
  72                                 // execute in order. This doesn't have to be perfect, but could be done
  73                                 // properly using fake timers.
  74                                 if i < len(test.events)-1 {
  75                                         time.Sleep(10 * time.Millisecond)
  76                                 }
  77                         }
  78                         wg.Wait()
  79                         for _, event := range test.events {
  80                                 if event.fired != event.wantFired {
  81                                         t.Errorf("(key: %q, order: %d): fired = %t, want %t",
  82                                                 event.key, event.order, event.fired, event.wantFired)
  83                                 }
  84                         }
  85                 })
  86         }
  87 }