1// Copyright (C) MongoDB, Inc. 2017-present.
2//
3// Licensed under the Apache License, Version 2.0 (the "License"); you may
4// not use this file except in compliance with the License. You may obtain
5// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
6
7package mongo
8
9import (
10	"testing"
11
12	"go.mongodb.org/mongo-driver/internal/testutil/assert"
13)
14
15func TestChangeStream(t *testing.T) {
16	t.Run("nil cursor", func(t *testing.T) {
17		cs := &ChangeStream{}
18
19		id := cs.ID()
20		assert.Equal(t, int64(0), id, "expected ID 0, got %v", id)
21		assert.False(t, cs.Next(bgCtx), "expected Next to return false, got true")
22		err := cs.Decode(nil)
23		assert.Equal(t, ErrNilCursor, err, "expected error %v, got %v", ErrNilCursor, err)
24		err = cs.Err()
25		assert.Nil(t, err, "change stream error: %v", err)
26		err = cs.Close(bgCtx)
27		assert.Nil(t, err, "Close error: %v", err)
28	})
29}
30