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goref_test.go
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goref_test.go
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package ref
import (
"context"
"testing"
)
func TestRef(t *testing.T) {
t.Parallel()
testCases := [...]struct {
name string
refValue any
updateValue any
}{
{
name: "ValidRef",
refValue: 0,
updateValue: 10,
},
}
for i := range testCases {
tc := testCases[i]
t.Run(tc.name, func(t *testing.T) {
testRef := NewRef(tc.refValue)
v := testRef.Value()
if v != tc.refValue {
t.Errorf("unexpected ref value, expected %d got %d", tc.refValue, v)
return
}
testRef.SetValue(tc.updateValue)
v = testRef.Value()
if v != tc.updateValue {
t.Errorf("unexpected ref value, expected %d got %d", tc.updateValue, v)
}
})
}
}
func TestWatchImmediate(t *testing.T) {
t.Parallel()
const maxExecutions = 100
countExecutionsWatch := 0
testRef := NewRef(struct{}{})
readyCh := make(chan struct{})
WatchImmediate(func(actualValues, prevValues []struct{}, ctx context.Context) {
countExecutionsWatch++
readyCh <- struct{}{}
}, testRef)
for i := 0; i < maxExecutions; i++ {
<-readyCh
testRef.SetValue(struct{}{})
}
<-readyCh
// plus-one because WatchImmediate executes the watcher before returning
if countExecutionsWatch != maxExecutions+1 {
t.Errorf("unexpected count value, expected %d got %d", maxExecutions+1, countExecutionsWatch)
return
}
t.Run("CancelFunc", func(t *testing.T) {
const setUntil = 50
countExecutionsWatch = 0
testRef := NewRef(struct{}{})
readyCh := make(chan struct{})
var chAlreadyClosed bool
cancel := WatchImmediate(func(actualValues, prevValues []struct{}, ctx context.Context) {
countExecutionsWatch++
if !chAlreadyClosed {
readyCh <- struct{}{}
}
}, testRef)
<-readyCh
for i := 0; i < maxExecutions; i++ {
if i >= setUntil {
cancel()
if !chAlreadyClosed {
close(readyCh)
chAlreadyClosed = true
}
}
testRef.SetValue(struct{}{})
<-readyCh
}
if countExecutionsWatch != setUntil+1 {
t.Errorf("unexpected count value, expected %d got %d", setUntil+1, countExecutionsWatch)
return
}
})
}
func TestWatch(t *testing.T) {
t.Parallel()
const maxExecutions = 100
countExecutionsWatch := 0
testRef := NewRef(struct{}{})
readyCh := make(chan struct{})
Watch(func(actualValues, prevValues []struct{}, ctx context.Context) {
countExecutionsWatch++
readyCh <- struct{}{}
}, testRef)
for i := 0; i < maxExecutions; i++ {
testRef.SetValue(struct{}{})
<-readyCh
}
if countExecutionsWatch != maxExecutions {
t.Errorf("unexpected count value, expected %d got %d", maxExecutions+1, countExecutionsWatch)
return
}
t.Run("CancelFunc", func(t *testing.T) {
const setUntil = 50
countExecutionsWatch = 0
testRef := NewRef(struct{}{})
readyCh := make(chan struct{})
var chAlreadyClosed bool
cancel := Watch(func(actualValues, prevValues []struct{}, ctx context.Context) {
countExecutionsWatch++
if !chAlreadyClosed {
readyCh <- struct{}{}
}
}, testRef)
for i := 0; i < maxExecutions; i++ {
if i >= setUntil {
cancel()
if !chAlreadyClosed {
close(readyCh)
chAlreadyClosed = true
}
}
testRef.SetValue(struct{}{})
<-readyCh
}
if countExecutionsWatch != setUntil {
t.Errorf("unexpected count value, expected %d got %d", setUntil, countExecutionsWatch)
return
}
})
}