ooni-probe-cli/internal/engine/netx/cacheresolver_test.go

package netx

import (
	"context"
	"errors"
	"testing"

	"github.com/ooni/probe-cli/v3/internal/model/mocks"
)

func TestCacheResolverFailure(t *testing.T) {
	expected := errors.New("mocked error")
	r := &mocks.Resolver{
		MockLookupHost: func(ctx context.Context, domain string) ([]string, error) {
			return nil, expected
		},
	}
	cache := &CacheResolver{Resolver: r}
	addrs, err := cache.LookupHost(context.Background(), "www.google.com")
	if !errors.Is(err, expected) {
		t.Fatal("not the error we expected")
	}
	if addrs != nil {
		t.Fatal("expected nil addrs here")
	}
	if cache.Get("www.google.com") != nil {
		t.Fatal("expected empty cache here")
	}
}

func TestCacheResolverHitSuccess(t *testing.T) {
	expected := errors.New("mocked error")
	r := &mocks.Resolver{
		MockLookupHost: func(ctx context.Context, domain string) ([]string, error) {
			return nil, expected
		},
	}
	cache := &CacheResolver{Resolver: r}
	cache.Set("dns.google.com", []string{"8.8.8.8"})
	addrs, err := cache.LookupHost(context.Background(), "dns.google.com")
	if err != nil {
		t.Fatal(err)
	}
	if len(addrs) != 1 || addrs[0] != "8.8.8.8" {
		t.Fatal("not the result we expected")
	}
}

func TestCacheResolverMissSuccess(t *testing.T) {
	r := &mocks.Resolver{
		MockLookupHost: func(ctx context.Context, domain string) ([]string, error) {
			return []string{"8.8.8.8"}, nil
		},
	}
	cache := &CacheResolver{Resolver: r}
	addrs, err := cache.LookupHost(context.Background(), "dns.google.com")
	if err != nil {
		t.Fatal(err)
	}
	if len(addrs) != 1 || addrs[0] != "8.8.8.8" {
		t.Fatal("not the result we expected")
	}
	if cache.Get("dns.google.com")[0] != "8.8.8.8" {
		t.Fatal("expected full cache here")
	}
}

func TestCacheResolverReadonlySuccess(t *testing.T) {
	r := &mocks.Resolver{
		MockLookupHost: func(ctx context.Context, domain string) ([]string, error) {
			return []string{"8.8.8.8"}, nil
		},
	}
	cache := &CacheResolver{Resolver: r, ReadOnly: true}
	addrs, err := cache.LookupHost(context.Background(), "dns.google.com")
	if err != nil {
		t.Fatal(err)
	}
	if len(addrs) != 1 || addrs[0] != "8.8.8.8" {
		t.Fatal("not the result we expected")
	}
	if cache.Get("dns.google.com") != nil {
		t.Fatal("expected empty cache here")
	}
}