How to use StringUtilsTests class of Gherkin.Specs package

1using System;
2using Xunit;
3
4namespace Gherkin.Specs
5{
6    public class StringUtilsTests
7    {
8        [Fact]
9        public void StartsWithWorks()
10        {
11            var bookEmoji = "\ud83d\udcd5";
12            var zzzzEmoji = "\ud83d\udca4";
13
14            Assert.True(StringUtils.StartsWith(bookEmoji+"abc", bookEmoji));
15            Assert.False(StringUtils.StartsWith(bookEmoji+"abc", zzzzEmoji));
16        }
17
18        [Fact]
19        public void StartsWithTitleLineWorks()
20        {
21            var bookEmoji = "\ud83d\udcd5";
22            Assert.Equal(1, StringUtils.CountSymbols(bookEmoji));
23        }
24    }
25}
26

Source: StringUtilsTests.cs

using System;
using Xunit;

namespace Gherkin.Specs
{
    public class StringUtilsTests
    {
        [Fact]
        public void StartsWithWorks()
        {
            var bookEmoji = "\ud83d\udcd5";
            var zzzzEmoji = "\ud83d\udca4";

            Assert.True(StringUtils.StartsWith(bookEmoji+"abc", bookEmoji));
            Assert.False(StringUtils.StartsWith(bookEmoji+"abc", zzzzEmoji));
        }

        [Fact]
        public void StartsWithTitleLineWorks()
        {
            var bookEmoji = "\ud83d\udcd5";
            Assert.Equal(1, StringUtils.CountSymbols(bookEmoji));
        }
    }
}