Add more explicit tests

Author: mattico

src/float/add.rs

@@ -219,10 +219,25 @@ mod test {
 
     // More tests for special float values
 
+    #[test]
+    fn test_float_tiny_plus_tiny() {
+        let tiny = <f32 as Float>::from_repr(1);
+        let r = super::__addsf3(tiny, tiny);
+        assert_eq!(r, tiny + tiny);
+    }
+
+    #[test]
+    fn test_float_small_plus_small() {
+        let a = <f32 as Float>::from_repr(327);
+        let b = <f32 as Float>::from_repr(256);
+        let r = super::__addsf3(a, b);
+        assert_eq!(r, a + b);
+    }
+
     #[test]
     fn test_float_one_plus_one() {
-        let r = super::__addsf3(<f32 as Float>::from_repr(1), <f32 as Float>::from_repr(1));
-        assert_eq!(r, <f32 as Float>::from_repr(1) + <f32 as Float>::from_repr(1));
+        let r = super::__addsf3(1f32, 1f32);
+        assert_eq!(r, 1f32 + 1f32);
     }
 
     #[test]