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/tgtest/vector_test.go

@@ -0,0 +1,56 @@
+package tgtest
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"go.mau.fi/mautrix-telegram/pkg/gotd/bin"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/testutil"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
+)
+
+type badEncoder struct{}
+
+func (e badEncoder) Encode(b *bin.Buffer) error {
+	return testutil.TestError()
+}
+
+func TestGenericVector_Encode(t *testing.T) {
+	tests := []struct {
+		name    string
+		data    []bin.Encoder
+		expect  bin.Decoder
+		wantErr bool
+	}{
+		{"Empty", nil, nil, false},
+		{"Nil", []bin.Encoder{nil}, nil, true},
+		{"BadObject", []bin.Encoder{badEncoder{}}, nil, true},
+		{
+			"Plain",
+			[]bin.Encoder{&tg.BotCommand{
+				Command:     "hello",
+				Description: "world",
+			}},
+			&tg.BotCommandVector{},
+			false,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var (
+				a   = require.New(t)
+				v   = genericVector{Elems: test.data}
+				buf bin.Buffer
+			)
+
+			err := v.Encode(&buf)
+			if test.wantErr {
+				a.Error(err)
+			} else if test.expect != nil {
+				a.NoError(test.expect.Decode(&buf))
+			}
+		})
+	}
+}