Update guard test

tests/guard.rs

@@ -489,3 +489,58 @@ pub async fn test_guard_race_operator() {
         }]
     );
 }
+
+#[tokio::test]
+pub async fn test_guard_use_params() {
+    struct EqGuard {
+        expect: i32,
+        actual: i32,
+    }
+
+    #[async_trait::async_trait]
+    impl Guard for EqGuard {
+        async fn check(&self, _ctx: &Context<'_>) -> Result<()> {
+            if self.expect != self.actual {
+                Err("Forbidden".into())
+            } else {
+                Ok(())
+            }
+        }
+    }
+
+    struct Query;
+
+    #[Object]
+    impl Query {
+        #[graphql(guard(EqGuard(expect = "100", actual = "@value")))]
+        async fn get(&self, value: i32) -> i32 {
+            value
+        }
+    }
+
+    let schema = Schema::new(Query, EmptyMutation, EmptySubscription);
+
+    assert_eq!(
+        schema
+            .execute(Request::new("{ get(value: 100) }"))
+            .await
+            .into_result()
+            .unwrap()
+            .data,
+        value!({"get": 100})
+    );
+
+    assert_eq!(
+        schema
+            .execute(Request::new("{ get(value: 99) }"))
+            .await
+            .into_result()
+            .unwrap_err(),
+        vec![ServerError {
+            message: "Forbidden".to_string(),
+            locations: vec![Pos { line: 1, column: 3 }],
+            path: vec![PathSegment::Field("get".to_owned())],
+            extensions: None,
+        }]
+    );
+}