added support for searching by mentions

Octokit.Tests.Integration/Clients/IssuesClientTests.cs

@@ -212,6 +212,31 @@ public class IssuesClientTests : IDisposable
         Assert.Equal(0, issuesCreatedByExternalUser.Count);
     }
 
+    [IntegrationTest]
+    public async Task CanFilterByMentioned()
+    {
+        var owner = _repository.Owner.Login;
+        var newIssue1 = new NewIssue("An issue") { Body = "words words words hello there @shiftkey" };
+        var newIssue2 = new NewIssue("Another issue") { Body = "some other words" };
+        await _issuesClient.Create(owner, _repository.Name, newIssue1);
+        await _issuesClient.Create(owner, _repository.Name, newIssue2);
+
+        var allIssues = await _issuesClient.GetForRepository(owner, _repository.Name,
+            new RepositoryIssueRequest());
+
+        Assert.Equal(2, allIssues.Count);
+
+        var mentionsWithShiftkey = await _issuesClient.GetForRepository(owner, _repository.Name,
+            new RepositoryIssueRequest { Mentioned = "shiftkey" });
+
+        Assert.Equal(1, mentionsWithShiftkey.Count);
+
+        var mentionsWithHaacked = await _issuesClient.GetForRepository(owner, _repository.Name,
+            new RepositoryIssueRequest { Mentioned = "haacked" });
+
+        Assert.Equal(0, mentionsWithHaacked.Count);
+    }
+
     [IntegrationTest]
     public async Task FilteringByInvalidAccountThrowsError()
     {

Octokit/Models/Request/RepositoryIssueRequest.cs

@@ -26,5 +26,10 @@ namespace Octokit
         /// Specify "none" for issues with no assigned user
         /// </remarks>
         public string Creator { get; set; }
+
+        /// <summary>
+        /// A user that’s mentioned in the issue
+        /// </summary>
+        public string Mentioned { get; set; }
     }
 }