Add instance tests

tests/instance.rs

@@ -0,0 +1,12 @@
+mod common;
+
+#[tokio::test]
+async fn generate_general_configuration_schema() {
+    let bundle = common::setup().await;
+    bundle
+        .instance
+        .general_configuration_schema()
+        .await
+        .unwrap();
+    common::teardown(bundle).await;
+}