add a test for unary after new binary ops

src/tests.rs

@@ -791,4 +791,48 @@ fn test_binary_ops() {
     } else {
         assert!(false);
     }
-}
+}
+
+#[test]
+// TODO also add test case for unary after compound
+// Hah, turns out unary + has a good use after all!
+fn test_unary_after_binary()
+{
+    let mut engine = Engine::new();
+
+    if let Ok(result) = engine.eval::<i64>("10 % +4") {
+        assert_eq!(result, 2);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("10 << +4") {
+        assert_eq!(result, 160);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("10 >> +4") {
+        assert_eq!(result, 0);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("10 & +4") {
+        assert_eq!(result, 0);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("10 | +4") {
+        assert_eq!(result, 14);
+    } else {
+        assert!(false);
+    }
+
+    if let Ok(result) = engine.eval::<i64>("10 ^ +4") {
+        assert_eq!(result, 14);
+    } else {
+        assert!(false);
+    }
+}