Add -0.0 to fraction constructor test cases.
diff --git a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/CommonTestCases.java b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/CommonTestCases.java
index a421421..f6b6a7f 100644
--- a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/CommonTestCases.java
+++ b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/CommonTestCases.java
@@ -166,6 +166,7 @@
         testCases.add(new DoubleToFractionTestCase(0.40000000000001, 2, 5));
         testCases.add(new DoubleToFractionTestCase(15.0000000000001, 15, 1));
         testCases.add(new DoubleToFractionTestCase(0.0, 0, 1));
+        testCases.add(new DoubleToFractionTestCase(-0.0, 0, 1));
 
         return testCases;
     }