test(admin): stabilize telemetry outcome assertions

apps/admin-api/src/service/imports/external_references.rs

@@ -403,3 +403,14 @@ fn materialization_failure(stage: &'static str, error_code: &'static str, count:
         "external OpenAPI materialization failed"
     );
 }
+
+#[cfg(test)]
+mod tests {
+    use super::external_fetch_error_code;
+
+    #[test]
+    fn unexpected_status_has_a_stable_safe_error_code() {
+        let error = crank_runtime::ExternalReferenceFetchError::UnexpectedStatus { status: 500 };
+        assert_eq!(external_fetch_error_code(&error), "unexpected_status");
+    }
+}