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// Copyright 2024 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 unique
import (
"fmt"
"internal/abi"
"reflect"
"runtime"
"testing"
)
// Set up special types. Because the internal maps are sharded by type,
// this will ensure that we're not overlapping with other tests.
type testString string
type testIntArray [4]int
type testEface any
type testStringArray [3]string
type testStringStruct struct {
a string
}
type testStringStructArrayStruct struct {
s [2]testStringStruct
}
type testStruct struct {
z float64
b string
}
func TestHandle(t *testing.T) {
testHandle[testString](t, "foo")
testHandle[testString](t, "bar")
testHandle[testString](t, "")
testHandle[testIntArray](t, [4]int{7, 77, 777, 7777})
testHandle[testEface](t, nil)
testHandle[testStringArray](t, [3]string{"a", "b", "c"})
testHandle[testStringStruct](t, testStringStruct{"x"})
testHandle[testStringStructArrayStruct](t, testStringStructArrayStruct{
s: [2]testStringStruct{testStringStruct{"y"}, testStringStruct{"z"}},
})
testHandle[testStruct](t, testStruct{0.5, "184"})
testHandle[testEface](t, testEface("hello"))
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}
func testHandle[T comparable](t *testing.T, value T) {
name := reflect.TypeFor[T]().Name()
t.Run(fmt.Sprintf("%s/%#v", name, value), func(t *testing.T) {
t.Parallel()
v0 := Make(value)
v1 := Make(value)
if v0.Value() != v1.Value() {
t.Error("v0.Value != v1.Value")
}
if v0.Value() != value {
t.Errorf("v0.Value not %#v", value)
}
if v0 != v1 {
t.Error("v0 != v1")
}
drainMaps(t)
checkMapsFor(t, value)
})
}
// drainMaps ensures that the internal maps are drained.
func drainMaps(t *testing.T) {
t.Helper()
wait := make(chan struct{}, 1)
// Set up a one-time notification for the next time the cleanup runs.
// Note: this will only run if there's no other active cleanup, so
// we can be sure that the next time cleanup runs, it'll see the new
// notification.
cleanupMu.Lock()
cleanupNotify = append(cleanupNotify, func() {
select {
case wait <- struct{}{}:
default:
}
})
runtime.GC()
cleanupMu.Unlock()
// Wait until cleanup runs.
<-wait
}
func checkMapsFor[T comparable](t *testing.T, value T) {
// Manually load the value out of the map.
typ := abi.TypeFor[T]()
a, ok := uniqueMaps.Load(typ)
if !ok {
return
}
m := a.(*uniqueMap[T])
wp, ok := m.Load(value)
if !ok {
return
}
if wp.Strong() != nil {
t.Errorf("value %v still referenced a handle (or tiny block?) ", value)
return
}
t.Errorf("failed to drain internal maps of %v", value)
}