add test for eq_slice fix

Author: apasel422

src/libcore/str.rs

@@ -2230,6 +2230,13 @@ mod tests {
         assert (!eq(&~"foo", &~"bar"));
     }
 
+    #[test]
+    fn test_eq_slice() {
+        assert (eq_slice(view("foobar", 0, 3), "foo"));
+        assert (eq_slice(view("barfoo", 3, 6), "foo"));
+        assert (!eq_slice("foo1", "foo2"));
+    }
+
     #[test]
     fn test_le() {
         assert (le(&"", &""));