(GH-365) Add method to close comment thread (#366)

Author: twenzel

src/Cake.AzureDevOps.Tests/Repos/PullRequest/AzureDevOpsPullRequestTests.cs

@@ -681,6 +681,20 @@ public void Should_Resolve_Comment_Thread()
                 // ?? Nothing to validate here since the method returns void
             }
 
+            [Fact]
+            public void Should_Resolve_Close_Thread()
+            {
+                // Given
+                var fixture = new PullRequestFixture(BasePullRequestFixture.ValidAzureDevOpsUrl, 21);
+                var pullRequest = new AzureDevOpsPullRequest(fixture.Log, fixture.Settings, fixture.GitClientFactory);
+
+                // When
+                pullRequest.CloseCommentThread(123);
+
+                // Then
+                // ?? Nothing to validate here since the method returns void
+            }
+
             [Fact]
             public void Should_Not_Throw_If_Null_Is_Returned()
             {

src/Cake.AzureDevOps/Repos/PullRequest/AzureDevOpsPullRequest.cs

@@ -573,6 +573,15 @@ public void ActivateCommentThread(int threadId)
             this.SetCommentThreadStatus(threadId, CommentThreadStatus.Active);
         }
 
+        /// <summary>
+        /// Sets the pull request comment thread to <see cref="CommentThreadStatus.Closed"/>.
+        /// </summary>
+        /// <param name="threadId">The Id of the comment thread.</param>
+        public void CloseCommentThread(int threadId)
+        {
+            this.SetCommentThreadStatus(threadId, CommentThreadStatus.Closed);
+        }
+
         /// <summary>
         /// Creates a new comment thread with a single comment in the pull request.
         /// </summary>