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diff --git a/test/jalview/commands/TrimRegionCommandTest.java b/test/jalview/commands/TrimRegionCommandTest.java
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+++ b/test/jalview/commands/TrimRegionCommandTest.java
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+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *  
+ * Jalview is distributed in the hope that it will be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty 
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
+ * PURPOSE.  See the GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
+package jalview.commands;
+
+import static org.testng.AssertJUnit.assertEquals;
+
+import jalview.datamodel.Alignment;
+import jalview.datamodel.AlignmentI;
+import jalview.datamodel.Sequence;
+import jalview.datamodel.SequenceI;
+
+import org.testng.annotations.BeforeMethod;
+import org.testng.annotations.Test;
+
+/**
+ * Unit tests for TrimRegionCommand
+ * 
+ * @author gmcarstairs
+ *
+ */
+public class TrimRegionCommandTest
+{
+  private AlignmentI al;
+
+  @BeforeMethod(alwaysRun = true)
+  public void setUp()
+  {
+    SequenceI[] seqs = new SequenceI[2];
+    seqs[0] = new Sequence("seq0", "abcde-");
+    seqs[1] = new Sequence("seq1", "-ghjkl");
+    al = new Alignment(seqs);
+    al.setDataset(null);
+  }
+
+  /**
+   * Test performing, undoing and redoing a 'trim left'
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimLeft_withUndoAndRedo()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Left", true,
+            al.getSequencesArray(), 2, al);
+    assertEquals(2, cmd.getSize());
+    assertEquals("cde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("hjkl", al.getSequenceAt(1).getSequenceAsString());
+
+    /*
+     * undo and verify
+     */
+    cmd.undoCommand(new AlignmentI[] { al });
+    assertEquals("abcde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-ghjkl", al.getSequenceAt(1).getSequenceAsString());
+
+    /*
+     * redo and verify
+     */
+    cmd.doCommand(new AlignmentI[] { al });
+    assertEquals("cde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("hjkl", al.getSequenceAt(1).getSequenceAsString());
+  }
+
+  /**
+   * Trim left of no columns - should do nothing. This is the case where the
+   * first column is selected and 'Remove Left' is selected.
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimLeft_noColumns()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Left", true,
+            al.getSequencesArray(), 0, al);
+    assertEquals(0, cmd.getSize());
+    assertEquals("abcde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-ghjkl", al.getSequenceAt(1).getSequenceAsString());
+  }
+
+  /**
+   * Trim left of a single column
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimLeft_oneColumn()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Left", true,
+            al.getSequencesArray(), 1, al);
+    assertEquals(1, cmd.getSize());
+    assertEquals("bcde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("ghjkl", al.getSequenceAt(1).getSequenceAsString());
+  }
+
+  /**
+   * Trim right of no columns - should do nothing. This is the case where the
+   * last column is selected and 'Remove Right' is selected.
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimRight_noColumns()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Right", false,
+            al.getSequencesArray(), 5, al);
+    assertEquals(0, cmd.getSize());
+    assertEquals("abcde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-ghjkl", al.getSequenceAt(1).getSequenceAsString());
+  }
+
+  /**
+   * Trim right of a single column
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimRight_oneColumn()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Right", false,
+            al.getSequencesArray(), 4, al);
+    assertEquals(1, cmd.getSize());
+    assertEquals("abcde", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-ghjk", al.getSequenceAt(1).getSequenceAsString());
+  }
+
+  /**
+   * Test performing, undoing and redoing a 'trim right'
+   */
+  @Test(groups = { "Functional" })
+  public void testTrimRight_withUndoAndRedo()
+  {
+    TrimRegionCommand cmd = new TrimRegionCommand("Remove Right", false,
+            al.getSequencesArray(), 2, al);
+    assertEquals(3, cmd.getSize());
+    assertEquals("abc", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-gh", al.getSequenceAt(1).getSequenceAsString());
+
+    /*
+     * undo and verify
+     */
+    cmd.undoCommand(new AlignmentI[] { al });
+    assertEquals("abcde-", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-ghjkl", al.getSequenceAt(1).getSequenceAsString());
+
+    /*
+     * redo and verify
+     */
+    cmd.doCommand(new AlignmentI[] { al });
+    assertEquals("abc", al.getSequenceAt(0).getSequenceAsString());
+    assertEquals("-gh", al.getSequenceAt(1).getSequenceAsString());
+  }
+}