test negative arguments of next_multiple_of

Author: strake

src/lib.rs

@@ -199,8 +199,10 @@ pub trait Integer: Sized + Num + PartialOrd + Ord + Eq {
     ///
     /// ~~~
     /// # use num_integer::Integer;
-    /// assert_eq!(16.next_multiple_of(&8), 16);
-    /// assert_eq!(23.next_multiple_of(&8), 24);
+    /// assert_eq!(16.next_multiple_of(& 8), 16);
+    /// assert_eq!(23.next_multiple_of(& 8), 24);
+    /// assert_eq!(16.next_multiple_of(&-8), 16);
+    /// assert_eq!(23.next_multiple_of(&-8), 16);
     /// ~~~
     #[inline]
     fn next_multiple_of(&self, other: &Self) -> Self where Self: Clone {
@@ -214,8 +216,10 @@ pub trait Integer: Sized + Num + PartialOrd + Ord + Eq {
     ///
     /// ~~~
     /// # use num_integer::Integer;
-    /// assert_eq!(16.next_multiple_back_of(&8), 16);
-    /// assert_eq!(23.next_multiple_back_of(&8), 16);
+    /// assert_eq!(16.next_multiple_back_of(& 8), 16);
+    /// assert_eq!(23.next_multiple_back_of(& 8), 16);
+    /// assert_eq!(16.next_multiple_back_of(&-8), 16);
+    /// assert_eq!(23.next_multiple_back_of(&-8), 24);
     /// ~~~
     #[inline]
     fn next_multiple_back_of(&self, other: &Self) -> Self where Self: Clone {