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diff --git a/test/jalview/ext/android/SparseIntArrayTest.java b/test/jalview/ext/android/SparseIntArrayTest.java
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+++ b/test/jalview/ext/android/SparseIntArrayTest.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.ext.android;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.fail;
+
+import jalview.gui.JvOptionPane;
+
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+/*
+ * Tests for SparseIntArray. Unlike SparseShortArray, SparseIntArray does not throw
+ * any exception for overflow.
+ */
+public class SparseIntArrayTest
+{
+
+  @BeforeClass(alwaysRun = true)
+  public void setUpJvOptionPane()
+  {
+    JvOptionPane.setInteractiveMode(false);
+    JvOptionPane.setMockResponse(JvOptionPane.CANCEL_OPTION);
+  }
+
+  @Test(groups = "Functional")
+  public void testPut()
+  {
+    SparseIntArray counter = new SparseIntArray();
+
+    /*
+     * either key or value may be in the range of int
+     */
+    counter.put(Integer.MAX_VALUE, Integer.MIN_VALUE);
+    counter.put(Integer.MIN_VALUE, Integer.MAX_VALUE);
+    assertEquals(counter.get(Integer.MAX_VALUE), Integer.MIN_VALUE);
+    assertEquals(counter.get(Integer.MIN_VALUE), Integer.MAX_VALUE);
+  }
+
+  @Test(groups = "Functional")
+  public void testAdd()
+  {
+    SparseIntArray counter = new SparseIntArray();
+  
+    assertEquals(counter.add('P', 2), 2);
+    assertEquals(counter.add('P', 3), 5);
+    counter.put('Q', 7);
+    assertEquals(counter.add('Q', 4), 11);
+
+    counter.put('x', Integer.MAX_VALUE);
+    try
+    {
+      counter.add('x', 1);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+  
+    counter.put('y', Integer.MIN_VALUE);
+    try
+    {
+      counter.add('y', -1);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+  }
+
+  @Test(groups = "Functional")
+  public void testCheckOverflow()
+  {
+    // things that don't overflow:
+    SparseIntArray.checkOverflow(Integer.MAX_VALUE, 0);
+    SparseIntArray.checkOverflow(Integer.MAX_VALUE, -1);
+    SparseIntArray.checkOverflow(Integer.MAX_VALUE, Integer.MIN_VALUE);
+    SparseIntArray.checkOverflow(Integer.MAX_VALUE, -Integer.MAX_VALUE);
+    SparseIntArray.checkOverflow(0, -Integer.MAX_VALUE);
+    SparseIntArray.checkOverflow(0, Integer.MIN_VALUE);
+    SparseIntArray.checkOverflow(Integer.MIN_VALUE, 0);
+    SparseIntArray.checkOverflow(Integer.MIN_VALUE, 1);
+    SparseIntArray.checkOverflow(Integer.MIN_VALUE, Integer.MAX_VALUE);
+
+    // and some that do
+    try
+    {
+      SparseIntArray.checkOverflow(Integer.MAX_VALUE, 1);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+    try
+    {
+      SparseIntArray.checkOverflow(Integer.MAX_VALUE - 1, 2);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+    try
+    {
+      SparseIntArray.checkOverflow(1, Integer.MAX_VALUE);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+    try
+    {
+      SparseIntArray.checkOverflow(Integer.MIN_VALUE, -1);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+    try
+    {
+      SparseIntArray.checkOverflow(Integer.MIN_VALUE + 1, -2);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+    try
+    {
+      SparseIntArray.checkOverflow(-1, Integer.MIN_VALUE);
+      fail("expected exception");
+    } catch (ArithmeticException e)
+    {
+      // expected
+    }
+  }
+
+}