diff --git a/main/tests/server/src/com/google/refine/tests/operations/cell/BlankDownTests.java b/main/tests/server/src/com/google/refine/tests/operations/cell/BlankDownTests.java
index 4c3238b3d..1bb957f1c 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/cell/BlankDownTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/cell/BlankDownTests.java
@@ -1,7 +1,5 @@
 package com.google.refine.tests.operations.cell;
 
-import static org.mockito.Mockito.when;
-
 import java.util.Properties;
 
 import org.json.JSONException;
diff --git a/main/tests/server/src/com/google/refine/tests/operations/cell/JoinMultiValuedCellsTests.java b/main/tests/server/src/com/google/refine/tests/operations/cell/JoinMultiValuedCellsTests.java
index d7a147502..c1a87aec7 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/cell/JoinMultiValuedCellsTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/cell/JoinMultiValuedCellsTests.java
@@ -47,7 +47,6 @@ import org.testng.annotations.Test;
 import com.google.refine.model.AbstractOperation;
 import com.google.refine.model.Project;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.cell.BlankDownOperation;
 import com.google.refine.operations.cell.MultiValuedCellJoinOperation;
 import com.google.refine.process.Process;
 import com.google.refine.tests.RefineTest;
diff --git a/main/tests/server/src/com/google/refine/tests/operations/cell/KeyValueColumnizeTests.java b/main/tests/server/src/com/google/refine/tests/operations/cell/KeyValueColumnizeTests.java
index 57b2a6c05..38567d48f 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/cell/KeyValueColumnizeTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/cell/KeyValueColumnizeTests.java
@@ -62,7 +62,6 @@ import com.google.refine.model.ModelException;
 import com.google.refine.model.Project;
 import com.google.refine.model.metadata.ProjectMetadata;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.cell.BlankDownOperation;
 import com.google.refine.operations.cell.KeyValueColumnizeOperation;
 import com.google.refine.process.Process;
 import com.google.refine.tests.RefineServletStub;
diff --git a/main/tests/server/src/com/google/refine/tests/operations/cell/SplitMultiValuedCellsTests.java b/main/tests/server/src/com/google/refine/tests/operations/cell/SplitMultiValuedCellsTests.java
index 0d020dbb8..2db201031 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/cell/SplitMultiValuedCellsTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/cell/SplitMultiValuedCellsTests.java
@@ -46,10 +46,9 @@ import org.testng.annotations.Test;
 
 import com.google.refine.model.AbstractOperation;
 import com.google.refine.model.Project;
-import com.google.refine.process.Process;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.cell.BlankDownOperation;
 import com.google.refine.operations.cell.MultiValuedCellSplitOperation;
+import com.google.refine.process.Process;
 import com.google.refine.tests.RefineTest;
 import com.google.refine.tests.util.TestUtils;
 
diff --git a/main/tests/server/src/com/google/refine/tests/operations/cell/TransposeTests.java b/main/tests/server/src/com/google/refine/tests/operations/cell/TransposeTests.java
index 6071a5f09..3c08cb0b3 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/cell/TransposeTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/cell/TransposeTests.java
@@ -38,16 +38,12 @@ import static org.mockito.Mockito.mock;
 import org.json.JSONException;
 import org.json.JSONObject;
 import org.slf4j.LoggerFactory;
-import org.testng.Assert;
 import org.testng.annotations.BeforeTest;
 import org.testng.annotations.Test;
 
-import com.google.refine.model.AbstractOperation;
 import com.google.refine.model.Project;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.cell.BlankDownOperation;
 import com.google.refine.operations.cell.TransposeRowsIntoColumnsOperation;
-import com.google.refine.process.Process;
 import com.google.refine.tests.RefineTest;
 import com.google.refine.tests.util.TestUtils;
 
diff --git a/main/tests/server/src/com/google/refine/tests/operations/column/ColumnMoveOperationTests.java b/main/tests/server/src/com/google/refine/tests/operations/column/ColumnMoveOperationTests.java
index 080f60bd6..61d7aef91 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/column/ColumnMoveOperationTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/column/ColumnMoveOperationTests.java
@@ -7,10 +7,8 @@ import org.json.JSONObject;
 import org.testng.annotations.BeforeSuite;
 import org.testng.annotations.Test;
 
-import com.google.refine.model.AbstractOperation;
 import com.google.refine.model.Project;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.cell.BlankDownOperation;
 import com.google.refine.operations.column.ColumnMoveOperation;
 import com.google.refine.tests.RefineTest;
 import com.google.refine.tests.util.TestUtils;
diff --git a/main/tests/server/src/com/google/refine/tests/operations/column/ColumnReorderOperationTests.java b/main/tests/server/src/com/google/refine/tests/operations/column/ColumnReorderOperationTests.java
index 0d07be1a1..cdf2b25f6 100644
--- a/main/tests/server/src/com/google/refine/tests/operations/column/ColumnReorderOperationTests.java
+++ b/main/tests/server/src/com/google/refine/tests/operations/column/ColumnReorderOperationTests.java
@@ -1,7 +1,5 @@
 package com.google.refine.tests.operations.column;
 
-import static org.mockito.Mockito.mock;
-
 import java.util.Arrays;
 
 import org.testng.annotations.BeforeSuite;
@@ -9,7 +7,6 @@ import org.testng.annotations.Test;
 
 import com.google.refine.model.AbstractOperation;
 import com.google.refine.operations.OperationRegistry;
-import com.google.refine.operations.column.ColumnMoveOperation;
 import com.google.refine.operations.column.ColumnReorderOperation;
 import com.google.refine.tests.RefineTest;
 import com.google.refine.tests.util.TestUtils;