diff --git a/crates/rust-analyzer/tests/slow-tests/main.rs b/crates/rust-analyzer/tests/slow-tests/main.rs
index 3fe3b9ae854..02b5e0e5e98 100644
--- a/crates/rust-analyzer/tests/slow-tests/main.rs
+++ b/crates/rust-analyzer/tests/slow-tests/main.rs
@@ -1093,10 +1093,18 @@ pub fn foo() {}
 
 //- /bar/src/lib.rs
 pub fn bar() {}
+
+//- /baz/Cargo.toml
+[package]
+name = "baz"
+version = "0.0.0"
+
+//- /baz/src/lib.rs
 "#,
     )
     .root("foo")
     .root("bar")
+    .root("baz")
     .with_config(json!({
        "files": {
            "excludeDirs": ["foo", "bar"]
diff --git a/crates/rust-analyzer/tests/slow-tests/support.rs b/crates/rust-analyzer/tests/slow-tests/support.rs
index 8600fbc3fb0..d81926855eb 100644
--- a/crates/rust-analyzer/tests/slow-tests/support.rs
+++ b/crates/rust-analyzer/tests/slow-tests/support.rs
@@ -255,6 +255,9 @@ pub(crate) fn wait_until_workspace_is_loaded(self) -> Server {
                     .clone()
                     .extract::<lsp_ext::ServerStatusParams>("experimental/serverStatus")
                     .unwrap();
+                if status.health == lsp_ext::Health::Error {
+                    panic!("server errored while loading workspace: {:?}", status.message);
+                }
                 status.quiescent
             }
             _ => false,