Fraction: test multiply by integer with zero cases.
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 8e0d979..718ca34 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
@@ -352,6 +352,10 @@
         Fraction f1 = Fraction.of(6, 35);
         Fraction f = f1.multiply(15);
         assertFraction(18, 7, f);
+
+        // Test zero with multiply by integer
+        Assertions.assertEquals(Fraction.ZERO, Fraction.ZERO.multiply(42));
+        Assertions.assertEquals(Fraction.ZERO, Fraction.of(1, 3).multiply(0));
     }
 
     @Test