diff --git a/crates/weft-appd/src/main.rs b/crates/weft-appd/src/main.rs
index f869290..fb4b2a7 100644
--- a/crates/weft-appd/src/main.rs
+++ b/crates/weft-appd/src/main.rs
@@ -497,6 +497,13 @@ mod tests {
         assert!(matches!(reg.state(42), AppStateKind::NotFound));
     }
 
+    #[tokio::test]
+    async fn dispatch_query_installed_returns_installed_apps() {
+        let reg = make_registry();
+        let resp = dispatch(Request::QueryInstalledApps, &reg).await;
+        assert!(matches!(resp, Response::InstalledApps { .. }));
+    }
+
     #[test]
     fn scan_installed_apps_finds_valid_packages() {
         use std::fs;
diff --git a/scripts/wsl-test.sh b/scripts/wsl-test.sh
index 77201e6..6481129 100644
--- a/scripts/wsl-test.sh
+++ b/scripts/wsl-test.sh
@@ -32,7 +32,7 @@ cargo test -p weft-appd 2>&1
 
 echo ""
 echo "==> cargo test -p weft-runtime"
-cargo test -p weft-runtime 2>&1
+cargo test -p weft-runtime -- --test-threads=1 2>&1
 
 echo ""
 echo "==> cargo test -p weft-pack"