Added in fun edge case where one of the multiple is '1'

Tests.cs

@@ -103,5 +103,14 @@ namespace JobNimbus_application
             Console.WriteLine($"Getting sum of multiples of {string.Join(',', multiples)} from 0-{range}. Should be 233168");
             Assert.Equal(233168, SumService.sumMultiples(multiples, range));
         }
+
+        [Fact]
+        public void Test13()
+        {
+            int[] multiples = {1,3,5};
+            int range = 10;
+            Console.WriteLine($"Getting sum of multiples of {string.Join(',', multiples)} from 0-{range}. Should be 45");
+            Assert.Equal(45, SumService.sumMultiples(multiples, range));
+        }
     }
 }