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lazy_test.go
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lazy_test.go
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package lazy_test
import (
"errors"
"sync"
"testing"
"github.com/asmsh/lazy"
)
func TestNew(t *testing.T) {
t.Run("when no error", func(t *testing.T) {
value := lazy.NewValue(func() (int, error) {
return 123, nil
})
got := value.Val()
if got != 123 {
t.Errorf("got %d, want %d", got, 123)
}
err := value.Err()
if err != nil {
t.Errorf("got %v, want %v", err, nil)
}
})
t.Run("when error", func(t *testing.T) {
value := lazy.NewValue(func() (int, error) {
return 123, errors.New("error")
})
got := value.Val()
if got != 123 {
t.Errorf("got %d, want %d", got, 123)
}
err := value.Err()
if err == nil {
t.Errorf("got %v, want %v", err, errors.New("error"))
}
})
t.Run("not loaded then loaded", func(t *testing.T) {
value := lazy.NewValue(func() (int, error) {
return 123, errors.New("error")
})
gotBefore := value.IsLoaded()
if gotBefore != false {
t.Errorf("got %t, want %t", gotBefore, false)
}
value.Val() // or value.Err()
gotAfter := value.IsLoaded()
if gotAfter != true {
t.Errorf("got %t, want %t", gotAfter, true)
}
})
t.Run("concurrent reading", func(t *testing.T) {
value := lazy.NewValue(func() (int, error) {
return 123, errors.New("error")
})
wg := sync.WaitGroup{}
wg.Add(3) // 3 concurrent readers
// concurrent reader 1
go func() {
defer wg.Done()
got := value.Val()
if got != 123 {
t.Errorf("got %d, want %d", got, 123)
}
}()
// concurrent reader 2
go func() {
defer wg.Done()
got := value.Val()
if got != 123 {
t.Errorf("got %d, want %d", got, 123)
}
}()
// concurrent error handler
go func() {
defer wg.Done()
err := value.Err()
if err == nil {
t.Errorf("got %v, want %v", err, errors.New("error"))
}
}()
wg.Wait()
})
}