Add router regression test

Author: sug0

crates/sdk/src/queries/router.rs

@@ -1044,6 +1044,25 @@ mod test {
         let result = TEST_RPC.handle(ctx, &request);
         assert!(result.is_err());
 
+        // Test request with another invalid path.
+        // The key difference here is that we are testing
+        // an invalid path in a nested segment.
+        let request = RequestQuery {
+            path: "/b/4".to_owned(),
+            data: Default::default(),
+            height: block::Height::from(0_u32),
+            prove: Default::default(),
+        };
+        let ctx = RequestCtx {
+            event_log: &client.event_log,
+            wl_storage: &client.wl_storage,
+            vp_wasm_cache: (),
+            tx_wasm_cache: (),
+            storage_read_past_height_limit: None,
+        };
+        let result = TEST_RPC.handle(ctx, &request);
+        assert!(result.is_err());
+
         // Test request with a non-ascii path
         let request = RequestQuery {
             path: "ÀÁõö÷øùúûüýþÿ".to_owned(),