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future_test.go
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future_test.go
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package async_test
import (
"context"
"errors"
"testing"
"time"
"github.com/ianlopshire/go-async"
)
func TestFuture_alreadyResolved(t *testing.T) {
// When an already-resolved Future is resolved it should panic with ErrAlreadyResolved.
defer func() {
if recover() != async.ErrAlreadyResolved {
t.Fatal("expected Future to panic with ErrAlreadyResolved")
}
}()
fut := new(async.Future[string])
async.ResolveFuture(fut, "Hello World!", nil)
async.ResolveFuture(fut, "Hello World!", nil)
}
func TestFuture_Value(t *testing.T) {
for name, tt := range map[string]struct {
v string
err error
}{
"with value": {"Hello World!", nil},
"with error": {"", errors.New("error")},
} {
t.Run(name, func(t *testing.T) {
fut := new(async.Future[string])
async.ResolveFuture(fut, tt.v, tt.err)
v, err := fut.Value()
if err != tt.err {
t.Fatalf("Value() unexpected error have %v, want %v", err, tt.err)
}
if v != tt.v {
t.Fatalf("Value() unexpected value have %v, want %v", v, tt.v)
}
})
}
}
func TestFuture_ValueCtx(t *testing.T) {
for name, tt := range map[string]struct {
v string
err error
}{
"with value": {"Hello World!", nil},
"with error": {"", errors.New("error")},
} {
t.Run(name, func(t *testing.T) {
fut := new(async.Future[string])
async.ResolveFuture(fut, tt.v, tt.err)
v, err := fut.ValueCtx(context.Background())
if err != tt.err {
t.Fatalf("Value() unexpected error have %v, want %v", err, tt.err)
}
if v != tt.v {
t.Fatalf("Value() unexpected value have %v, want %v", v, tt.v)
}
})
}
t.Run("with canceled context", func(t *testing.T) {
timeout := time.After(time.Second)
done := make(chan bool)
go func() {
ctx, cancel := context.WithCancel(context.Background())
cancel()
fut := new(async.Future[string])
_, err := fut.ValueCtx(ctx)
if err != context.Canceled {
t.Errorf("ValueCtx() unexpected error have %v, want %v", err, context.Canceled)
}
done <- true
}()
select {
case <-timeout:
t.Fatal("ValueCtx() future should not have blocked")
case <-done:
}
})
}