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diff --git a/test/jalview/util/StringUtilsTest.java b/test/jalview/util/StringUtilsTest.java
new file mode 100644
index 0000000..22a4130
--- /dev/null
+++ b/test/jalview/util/StringUtilsTest.java
@@ -0,0 +1,71 @@
+package jalview.util;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+
+import org.junit.Test;
+
+public class StringUtilsTest
+{
+
+  @Test
+  public void testInsertCharAt()
+  {
+    char[] c1 = "ABC".toCharArray();
+    char[] expected = new char[]
+    { 'A', 'B', 'C', 'w', 'w' };
+    assertTrue(Arrays.equals(expected,
+            StringUtils.insertCharAt(c1, 3, 2, 'w')));
+    expected = new char[]
+    { 'A', 'B', 'C', 'w', 'w' };
+    assertTrue(Arrays.equals(expected,
+            StringUtils.insertCharAt(c1, 4, 2, 'w')));
+    assertTrue(Arrays.equals(expected,
+            StringUtils.insertCharAt(c1, 5, 2, 'w')));
+    assertTrue(Arrays.equals(expected,
+            StringUtils.insertCharAt(c1, 6, 2, 'w')));
+    assertTrue(Arrays.equals(expected,
+            StringUtils.insertCharAt(c1, 7, 2, 'w')));
+  }
+
+  @Test
+  public void testDeleteChars()
+  {
+    char[] c1 = "ABC".toCharArray();
+
+    // delete second position
+    assertTrue(Arrays.equals(new char[]
+    { 'A', 'C' }, StringUtils.deleteChars(c1, 1, 2)));
+
+    // delete positions 1 and 2
+    assertTrue(Arrays.equals(new char[]
+    { 'C' }, StringUtils.deleteChars(c1, 0, 2)));
+
+    // delete positions 1-3
+    assertTrue(Arrays.equals(new char[]
+    {}, StringUtils.deleteChars(c1, 0, 3)));
+
+    // delete position 3
+    assertTrue(Arrays.equals(new char[]
+    { 'A', 'B' }, StringUtils.deleteChars(c1, 2, 3)));
+
+    // out of range deletion is ignore
+    assertTrue(Arrays.equals(c1, StringUtils.deleteChars(c1, 3, 4)));
+  }
+
+  @Test
+  public void testGetLastToken()
+  {
+    assertNull(StringUtils.getLastToken(null, null));
+    assertNull(StringUtils.getLastToken(null, "/"));
+    assertEquals("a", StringUtils.getLastToken("a", null));
+
+    assertEquals("abc", StringUtils.getLastToken("abc", "/"));
+    assertEquals("c", StringUtils.getLastToken("abc", "b"));
+    assertEquals("file1.dat", StringUtils.getLastToken(
+            "file://localhost:8080/data/examples/file1.dat", "/"));
+  }
+}