Fixed: Remove on Activity page should now work for Blackhole items.

src/NzbDrone.Core.Test/Download/DownloadClientTests/Blackhole/TorrentBlackholeFixture.cs

@@ -118,6 +118,58 @@ namespace NzbDrone.Core.Test.Download.DownloadClientTests.Blackhole
             items.First().Status.Should().Be(DownloadItemStatus.Downloading);
         }
 
+        [Test]
+        public void RemoveItem_should_delete_file()
+        {
+            GivenCompletedItem();
+
+            Mocker.GetMock<IDiskProvider>()
+                .Setup(c => c.FileExists(It.IsAny<string>()))
+                .Returns(true);
+
+            Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true);
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Once());
+        }
+
+        [Test]
+        public void RemoveItem_should_delete_directory()
+        {
+            GivenCompletedItem();
+
+            Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true);
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Once());
+        }
+
+        [Test]
+        public void RemoveItem_should_throw_if_unknown_item()
+        {
+            Assert.Throws<ArgumentException>(() => Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true));
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Never());
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Never());
+        }
+
+        [Test]
+        public void RemoveItem_should_throw_if_deleteData_is_false()
+        {
+            GivenCompletedItem();
+
+            Assert.Throws<NotSupportedException>(() => Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", false));
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Never());
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Never());
+        }
+
         [Test]
         public void should_return_status_with_outputdirs()
         {

src/NzbDrone.Core.Test/Download/DownloadClientTests/Blackhole/UsenetBlackholeFixture.cs

@@ -1,3 +1,5 @@
+
+using System;
 using System.IO;
 using System.Net;
 using System.Linq;
@@ -118,6 +120,58 @@ namespace NzbDrone.Core.Test.Download.DownloadClientTests.Blackhole
             result.Status.Should().Be(DownloadItemStatus.Downloading);
         }
 
+        [Test]
+        public void RemoveItem_should_delete_file()
+        {
+            GivenCompletedItem();
+
+            Mocker.GetMock<IDiskProvider>()
+                .Setup(c => c.FileExists(It.IsAny<string>()))
+                .Returns(true);
+
+            Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true);
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Once());
+        }
+
+        [Test]
+        public void RemoveItem_should_delete_directory()
+        {
+            GivenCompletedItem();
+
+            Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true);
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Once());
+        }
+
+        [Test]
+        public void RemoveItem_should_throw_if_unknown_item()
+        {
+            Assert.Throws<ArgumentException>(() => Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", true));
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Never());
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Never());
+        }
+
+        [Test]
+        public void RemoveItem_should_throw_if_deleteData_is_false()
+        {
+            GivenCompletedItem();
+
+            Assert.Throws<NotSupportedException>(() => Subject.RemoveItem("_Droned.S01E01.Pilot.1080p.WEB-DL-DRONE_0", false));
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFile(It.IsAny<string>()), Times.Never());
+
+            Mocker.GetMock<IDiskProvider>()
+                .Verify(c => c.DeleteFolder(It.IsAny<string>(), true), Times.Never());
+        }
+
         [Test]
         public void should_return_status_with_outputdirs()
         {

src/NzbDrone.Core/Download/Clients/TorrentBlackhole/TorrentBlackhole.cs

@@ -125,7 +125,28 @@ namespace NzbDrone.Core.Download.Clients.TorrentBlackhole
 
         public override void RemoveItem(string downloadId, bool deleteData)
         {
-            throw new NotSupportedException();
+            var downloadItem = GetItems().FirstOrDefault(v => v.DownloadId == downloadId);
+
+            if (downloadItem == null)
+            {
+                throw new ArgumentException(string.Format("Cannot remove DownloadItem {0} because it was not found.", downloadId));
+            }
+
+            if (!deleteData)
+            {
+                throw new NotSupportedException("Blackhole cannot remove DownloadItem without deleting the data as well, ignoring.");
+            }
+
+            var outputPath = downloadItem.OutputPath.FullPath;
+
+            if (_diskProvider.FileExists(outputPath))
+            {
+                _diskProvider.DeleteFile(outputPath);
+            }
+            else
+            {
+                _diskProvider.DeleteFolder(outputPath, true);
+            }
         }
 
         public override DownloadClientStatus GetStatus()

src/NzbDrone.Core/Download/Clients/UsenetBlackhole/UsenetBlackhole.cs

@@ -123,7 +123,28 @@ namespace NzbDrone.Core.Download.Clients.UsenetBlackhole
 
         public override void RemoveItem(string downloadId, bool deleteData)
         {
-            throw new NotSupportedException();
+            var downloadItem = GetItems().FirstOrDefault(v => v.DownloadId == downloadId);
+
+            if (downloadItem == null)
+            {
+                throw new ArgumentException(string.Format("Cannot remove DownloadItem {0} because it was not found.", downloadId));
+            }
+
+            if (!deleteData)
+            {
+                throw new NotSupportedException("Blackhole cannot remove DownloadItem without deleting the data as well, ignoring.");
+            }
+
+            var outputPath = downloadItem.OutputPath.FullPath;
+
+            if (_diskProvider.FileExists(outputPath))
+            {
+                _diskProvider.DeleteFile(outputPath);
+            }
+            else
+            {
+                _diskProvider.DeleteFolder(outputPath, true);
+            }
         }
 
         public override DownloadClientStatus GetStatus()