diff --git a/src/tests/junit/org/apache/tools/ant/util/StringUtilsTest.java b/src/tests/junit/org/apache/tools/ant/util/StringUtilsTest.java
index 5f934e590..7243b5280 100644
--- a/src/tests/junit/org/apache/tools/ant/util/StringUtilsTest.java
+++ b/src/tests/junit/org/apache/tools/ant/util/StringUtilsTest.java
@@ -103,4 +103,18 @@ public class StringUtilsTest extends TestCase {
         for (int i = 0; i < size; i++) { buf.append(ch); };
         return buf;
     }
+    
+    public void testParseHumanSizes() throws Exception {
+    	final long KILOBYTE = 1024;
+    	final long MEGABYTE = KILOBYTE * 1024;
+    	final long GIGABYTE = MEGABYTE * 1024;
+    	final long TERABYTE = GIGABYTE * 1024;
+    	final long PETABYTE = TERABYTE * 1024;
+    	assertEquals(StringUtils.parseHumanSizes("1K"), KILOBYTE);
+    	assertEquals(StringUtils.parseHumanSizes("1M"), MEGABYTE);
+    	assertEquals(StringUtils.parseHumanSizes("1G"), GIGABYTE);
+    	assertEquals(StringUtils.parseHumanSizes("1T"), TERABYTE);
+    	assertEquals(StringUtils.parseHumanSizes("1P"), PETABYTE);
+    	assertEquals(StringUtils.parseHumanSizes("1"), 1L);
+    }
 }