Subject: [PATCH] tests: finish parsing before inspecting editor state

EditorState creation has a 20 ms parsing budget. A descheduled test can
therefore observe an incomplete tree. Finish these small test documents
without an interactive deadline and publish the result with a transaction.
Keep the original completion and vector-matching assertions enabled.

--- a/module/codemirror-promql/src/test/utils-test.ts
+++ b/module/codemirror-promql/src/test/utils-test.ts
@@ -13,7 +13,7 @@
 
 import { parser } from '@prometheus-io/lezer-promql';
 import { EditorState } from '@codemirror/state';
-import { LRLanguage } from '@codemirror/language';
+import { ensureSyntaxTree, LRLanguage } from '@codemirror/language';
 import nock from 'nock';
 import path from 'path';
 import { fileURLToPath } from 'url';
@@ -23,10 +23,16 @@
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 export function createEditorState(expr: string): EditorState {
-  return EditorState.create({
+  const state = EditorState.create({
     doc: expr,
     extensions: lightPromQLSyntax,
   });
+  // These tests need a complete tree, independent of the editor's time budget.
+  if (!ensureSyntaxTree(state, state.doc.length, Infinity)) {
+    throw new Error('Unable to parse the test expression');
+  }
+  // Publish the completed parse so syntaxTree(state) sees it too.
+  return state.update({}).state;
 }
 
 export function mockPrometheusServer(): void {