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/bot_test.go

@@ -0,0 +1,46 @@
+package auth
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tgmock"
+)
+
+func TestClient_AuthBot(t *testing.T) {
+	const token = "12345:token"
+
+	t.Run("AuthAuthorization", func(t *testing.T) {
+		mock := tgmock.New(t)
+
+		testUser := &tg.User{}
+		testUser.SetBot(true)
+
+		mock.ExpectCall(&tg.AuthImportBotAuthorizationRequest{
+			BotAuthToken: token,
+			APIID:        testAppID,
+			APIHash:      testAppHash,
+		}).ThenResult(&tg.AuthAuthorization{User: testUser})
+
+		result, err := testClient(mock).Bot(context.Background(), token)
+		require.NoError(t, err)
+		require.Equal(t, testUser, result.User)
+	})
+
+	t.Run("AuthAuthorizationSignUpRequired", func(t *testing.T) {
+		mock := tgmock.New(t)
+
+		mock.ExpectCall(&tg.AuthImportBotAuthorizationRequest{
+			BotAuthToken: token,
+			APIID:        testAppID,
+			APIHash:      testAppHash,
+		}).ThenResult(&tg.AuthAuthorizationSignUpRequired{})
+
+		result, err := testClient(mock).Bot(context.Background(), token)
+		require.Error(t, err)
+		require.Nil(t, result)
+	})
+}