ooni-probe-cli/internal/engine/internal/sessionresolver/childresolver_test.go

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package sessionresolver
import (
"context"
"errors"
"io"
"testing"
"time"
"github.com/google/go-cmp/cmp"
)
type FakeResolver struct {
Closed bool
Data []string
Err error
Sleep time.Duration
}
func (r *FakeResolver) LookupHost(ctx context.Context, hostname string) ([]string, error) {
select {
case <-time.After(r.Sleep):
return r.Data, r.Err
case <-ctx.Done():
return nil, ctx.Err()
}
}
func (r *FakeResolver) CloseIdleConnections() {
r.Closed = true
}
func TestTimeLimitedLookupSuccess(t *testing.T) {
reso := &Resolver{}
re := &FakeResolver{
Data: []string{"8.8.8.8", "8.8.4.4"},
}
ctx := context.Background()
out, err := reso.timeLimitedLookup(ctx, re, "dns.google")
if err != nil {
t.Fatal(err)
}
if diff := cmp.Diff(re.Data, out); diff != "" {
t.Fatal(diff)
}
}
func TestTimeLimitedLookupFailure(t *testing.T) {
reso := &Resolver{}
re := &FakeResolver{
Err: io.EOF,
}
ctx := context.Background()
out, err := reso.timeLimitedLookup(ctx, re, "dns.google")
if !errors.Is(err, re.Err) {
t.Fatal("not the error we expected", err)
}
if out != nil {
t.Fatal("expected nil here")
}
}
func TestTimeLimitedLookupWillTimeout(t *testing.T) {
if testing.Short() {
t.Skip("skip test in short mode")
}
reso := &Resolver{}
re := &FakeResolver{
Err: io.EOF,
Sleep: 20 * time.Second,
}
ctx := context.Background()
out, err := reso.timeLimitedLookup(ctx, re, "dns.google")
if !errors.Is(err, context.DeadlineExceeded) {
t.Fatal("not the error we expected", err)
}
if out != nil {
t.Fatal("expected nil here")
}
}