diff --git a/src/tests/client.rs b/src/tests/client.rs
index 14c57f9..5a5468d 100644
--- a/src/tests/client.rs
+++ b/src/tests/client.rs
@@ -67,6 +67,24 @@ async fn test_workspace_attach_and_active_workspaces() {
 		})
 		.await
 }
+
+#[tokio::test]
+async fn test_attaching_to_non_existing_is_error() {
+	ClientFixture::of("alice")
+		.with(|client| {
+			let client = client.clone();
+
+			async move {
+				let workspace_name = uuid::Uuid::new_v4().to_string();
+
+				// we don't create any workspace.
+				// client.create_workspace(workspace_name).await?;
+				assert_or_err!(client.attach_workspace(&workspace_name).await.is_err());
+				Ok(())
+			}
+		})
+		.await
+}
 				Ok(())
 			}
 		})