move gotd fork into repo. (#111)

- update to latest telegram layer
- remove some references to fields in tg.Entities that don't exist in
the schema
- originally added here:
https://github.com/beeper/td/commit/820929062a2ba0104397bc01235ab58a9cff780e
  - referenced here
-
https://github.com/mautrix/telegramgo/commit/124f0967ed195b5a380c9bd02e170ada9710dde3
-
https://github.com/mautrix/telegramgo/commit/4205047aab2e0639217148b5d125bfaab668bd8e

pkg/gotd/telegram/auth/auth_test.go

@@ -0,0 +1,44 @@
+package auth
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tgmock"
+)
+
+const (
+	testAppID   = 1
+	testAppHash = "hash"
+)
+
+func testClient(invoker tg.Invoker) *Client {
+	return &Client{
+		api:     tg.NewClient(invoker),
+		rand:    rand.Reader,
+		appID:   testAppID,
+		appHash: testAppHash,
+	}
+}
+
+func mockClient(t *testing.T) (*tgmock.Mock, *Client) {
+	mock := tgmock.New(t)
+	return mock, NewClient(tg.NewClient(mock), testutil.ZeroRand{}, testAppID, testAppHash)
+}
+
+func mockTest(cb func(
+	a *require.Assertions,
+	mock *tgmock.Mock,
+	client *Client,
+)) func(t *testing.T) {
+	return func(t *testing.T) {
+		a := require.New(t)
+		m, client := mockClient(t)
+
+		cb(a, m, client)
+	}
+}