diff --git a/src/Lucene.Net.Tests/Util/Packed/TestEliasFanoDocIdSet.cs b/src/Lucene.Net.Tests/Util/Packed/TestEliasFanoDocIdSet.cs
index 5405d79c64..bff040174a 100644
--- a/src/Lucene.Net.Tests/Util/Packed/TestEliasFanoDocIdSet.cs
+++ b/src/Lucene.Net.Tests/Util/Packed/TestEliasFanoDocIdSet.cs
@@ -22,7 +22,6 @@ namespace Lucene.Net.Util.Packed
 
     using DocIdSetIterator = Lucene.Net.Search.DocIdSetIterator;
 
-    [TestFixture]
     public class TestEliasFanoDocIdSet : BaseDocIdSetTestCase<EliasFanoDocIdSet>
     {
         public override EliasFanoDocIdSet CopyOf(BitSet bs, int numBits)
diff --git a/src/Lucene.Net.Tests/Util/TestPForDeltaDocIdSet.cs b/src/Lucene.Net.Tests/Util/TestPForDeltaDocIdSet.cs
index 4f0c8b47ac..aadbb7f88a 100644
--- a/src/Lucene.Net.Tests/Util/TestPForDeltaDocIdSet.cs
+++ b/src/Lucene.Net.Tests/Util/TestPForDeltaDocIdSet.cs
@@ -20,7 +20,6 @@ namespace Lucene.Net.Util
      * limitations under the License.
      */
 
-    [TestFixture]
     public class TestPForDeltaDocIdSet : BaseDocIdSetTestCase<PForDeltaDocIdSet>
     {
         public override PForDeltaDocIdSet CopyOf(BitSet bs, int length)
diff --git a/src/Lucene.Net.Tests/Util/TestTimSorter.cs b/src/Lucene.Net.Tests/Util/TestTimSorter.cs
index 1d0bda19d0..0bcc503cec 100644
--- a/src/Lucene.Net.Tests/Util/TestTimSorter.cs
+++ b/src/Lucene.Net.Tests/Util/TestTimSorter.cs
@@ -17,7 +17,6 @@ namespace Lucene.Net.Util
      * limitations under the License.
      */
 
-    [TestFixture]
     public class TestTimSorter : BaseSortTestCase
     {
         public TestTimSorter()