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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lsp
import (
"testing"
"time"
)
func TestDebouncer(t *testing.T) {
t.Parallel()
type event struct {
key string
order uint64
wantFired bool
}
tests := []struct {
label string
events []*event
}{
{
label: "overridden",
events: []*event{
{key: "a", order: 1, wantFired: false},
{key: "a", order: 2, wantFired: true},
},
},
{
label: "distinct labels",
events: []*event{
{key: "a", order: 1, wantFired: true},
{key: "b", order: 2, wantFired: true},
},
},
{
label: "reverse order",
events: []*event{
{key: "a", order: 2, wantFired: true},
{key: "a", order: 1, wantFired: false},
},
},
{
label: "multiple overrides",
events: []*event{
{key: "a", order: 1, wantFired: false},
{key: "a", order: 2, wantFired: false},
{key: "a", order: 3, wantFired: false},
{key: "a", order: 4, wantFired: false},
{key: "a", order: 5, wantFired: true},
},
},
}
for _, test := range tests {
test := test
t.Run(test.label, func(t *testing.T) {
d := newDebouncer()
delays := make([]chan time.Time, len(test.events))
okcs := make([]<-chan bool, len(test.events))
// Register the events in deterministic order, synchronously.
for i, e := range test.events {
delays[i] = make(chan time.Time, 1)
okcs[i] = d.debounce(e.key, e.order, delays[i])
}
// Now see which event fired.
for i, okc := range okcs {
event := test.events[i]
delays[i] <- time.Now()
fired := <-okc
if fired != event.wantFired {
t.Errorf("[key: %q, order: %d]: fired = %t, want %t", event.key, event.order, fired, event.wantFired)
}
}
})
}
}
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