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diff --git a/test/java/org/apache/fop/util/PDFNumberTestCase.java b/test/java/org/apache/fop/util/PDFNumberTestCase.java
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+++ b/test/java/org/apache/fop/util/PDFNumberTestCase.java
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+/*
+ * Copyright 2005 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.util;
+
+import org.apache.fop.pdf.PDFNumber;
+
+import junit.framework.TestCase;
+
+/**
+ * This test tests PDFNumber's doubleOut() methods.
+ */
+public class PDFNumberTestCase extends TestCase {
+
+    /**
+     * Tests PDFNumber.doubleOut().
+     * @throws Exception if the test fails
+     */
+    public void testDoubleOut1() throws Exception {
+        //Default is 6 decimal digits
+        assertEquals("0", PDFNumber.doubleOut(0.0f));
+        assertEquals("0", PDFNumber.doubleOut(0.0000000000000000000123f));
+        assertEquals("0.1", PDFNumber.doubleOut(0.1f));
+        assertEquals("100", PDFNumber.doubleOut(100.0f));
+        assertEquals("100", PDFNumber.doubleOut(99.99999999999999999999999f));
+        
+        //You'd expect 100.123456 here but DecimalFormat uses the BigDecimal.ROUND_HALF_EVEN 
+        //strategy. I don't know if that's a problem. The strange thing testDoubleOut2
+        //seems to return the normally expected value. Weird.
+        assertEquals("100.123459", PDFNumber.doubleOut(100.12345611111111f));
+        assertEquals("-100.123459", PDFNumber.doubleOut(-100.12345611111111f));
+    }
+    
+    /**
+     * Tests PDFNumber.doubleOut().
+     * @throws Exception if the test fails
+     */
+    public void testDoubleOut2() throws Exception {
+        //4 decimal digits in this case
+        assertEquals("0", PDFNumber.doubleOut(0.0f, 4));
+        assertEquals("0", PDFNumber.doubleOut(0.0000000000000000000123f, 4));
+        assertEquals("0.1", PDFNumber.doubleOut(0.1f, 4));
+        assertEquals("100", PDFNumber.doubleOut(100.0f, 4));
+        assertEquals("100", PDFNumber.doubleOut(99.99999999999999999999999f, 4));
+        assertEquals("100.1234", PDFNumber.doubleOut(100.12341111111111f, 4));
+        assertEquals("-100.1234", PDFNumber.doubleOut(-100.12341111111111f, 4));
+    }
+    
+    /**
+     * Tests PDFNumber.doubleOut().
+     * @throws Exception if the test fails
+     */
+    public void testDoubleOut3() throws Exception {
+        //0 decimal digits in this case
+        assertEquals("0", PDFNumber.doubleOut(0.0f, 0));
+        assertEquals("0", PDFNumber.doubleOut(0.1f, 0));
+        assertEquals("1", PDFNumber.doubleOut(0.6f, 0));
+        assertEquals("100", PDFNumber.doubleOut(100.1234f, 0));
+        assertEquals("-100", PDFNumber.doubleOut(-100.1234f, 0));
+    }
+    
+    /**
+     * Tests PDFNumber.doubleOut(). Special cases (former bugs).
+     * @throws Exception if the test fails
+     */
+    public void testDoubleOut4() throws Exception {
+        double d = Double.parseDouble("5.7220458984375E-6");
+        assertEquals("0.000006", PDFNumber.doubleOut(d));
+        assertEquals("0", PDFNumber.doubleOut(d, 4));
+        assertEquals("0.00000572", PDFNumber.doubleOut(d, 8));
+    }
+    
+    /**
+     * Tests PDFNumber.doubleOut(). Tests for wrong parameters.
+     * @throws Exception if the test fails
+     */
+    public void testDoubleOutWrongParameters() throws Exception {
+        try {
+            PDFNumber.doubleOut(0.1f, -1);
+            fail("IllegalArgument expected!");
+        } catch (IllegalArgumentException iae) {
+            //we want that
+        }
+        try {
+            PDFNumber.doubleOut(0.1f, 17); //We support max 16 decimal digits
+            fail("IllegalArgument expected!");
+        } catch (IllegalArgumentException iae) {
+            //we want that
+        }
+        try {
+            PDFNumber.doubleOut(0.1f, 98274659);
+            fail("IllegalArgument expected!");
+        } catch (IllegalArgumentException iae) {
+            //we want that
+        }
+    }
+    
+}