octokit.net/Octokit.Tests/Models/SearchIssuesRequestTests.cs

using Octokit;
using Octokit.Tests.Helpers;
using Xunit;

internal class SearchIssuesRequestTests
{
    public class TheMergedQualifiersMethod
    {
        [Fact]
        public void ReturnsAReadOnlyDictionary()
        {
            var request = new SearchIssuesRequest("test");

            var result = request.MergedQualifiers();

            // If I can cast this to a writeable collection, then that defeats the purpose of a read only.
            AssertEx.IsReadOnlyCollection<string>(result);
        }
    }
}