FractionTest: zero divide should be equal to Fraction.ZERO

This relaxes the requirement that it is the same object as
Fraction.ZERO.
diff --git a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
index 931b4c5..5644c72 100644
--- a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
+++ b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
@@ -314,7 +314,7 @@
         Fraction f3 = Fraction.of(0, 5);
         Fraction f4 = Fraction.of(2, 7);
         Fraction f = f3.divide(f4);
-        Assertions.assertSame(Fraction.ZERO, f);
+        Assertions.assertEquals(Fraction.ZERO, f);
 
         final Fraction f5 = Fraction.of(Integer.MIN_VALUE, 1);
         Assertions.assertThrows(NullPointerException.class,