test: verify [async] marker is structural, not a filter

tests/sync_name_match_cjs/mod.js

@@ -0,0 +1,16 @@
+// A synchronous function expression and a synchronous object method.
+// This fixture guards that the name-based `functionQuery` variants match
+// synchronous functions: the `[async]` token in the generated selectors
+// is a structural "is-a-function-node" existence check (every function
+// node has an `async` field), NOT an async-only filter.
+const fetchExpr = function fetchExpr (x) {
+  return x + 1
+}
+
+const client = {
+  query (x) {
+    return x * 2
+  }
+}
+
+module.exports = { fetchExpr, client }

tests/sync_name_match_cjs/test.js

@@ -0,0 +1,16 @@
+// This test guards that the name-based `functionQuery` variants match
+// synchronous functions: the `[async]` token in the generated selectors
+// is a structural "is-a-function-node" existence check (every function
+// node has an `async` field), NOT an async-only filter.
+const { fetchExpr, client } = require('./instrumented.js')
+const { assert, getContext } = require('../common/preamble.js')
+
+// expressionName, kind: 'Sync' matched, fetchExpr is not async.
+const exprCtx = getContext('orchestrion:undici:fetch_expr_sync')
+assert.strictEqual(fetchExpr(1), 2)
+assert.deepStrictEqual(exprCtx, { start: true, end: 2 })
+
+// methodName (object method), kind: 'Sync' matched, query is not async.
+const methodCtx = getContext('orchestrion:undici:client_query_sync')
+assert.strictEqual(client.query(3), 6)
+assert.deepStrictEqual(methodCtx, { start: true, end: 6 })

tests/tests.test.mjs

@@ -475,6 +475,23 @@ describe('ast_query_returned_arrow_cjs', () => {
   })
 })
 
+describe('sync_name_match_cjs', () => {
+  test('name-based queries match synchronous functions (the [async] token is structural)', () => {
+    runTest('sync_name_match_cjs', [
+      {
+        channelName: 'fetch_expr_sync',
+        module: { name: TEST_MODULE_NAME, versionRange: '>=0.0.1', filePath: TEST_MODULE_PATH },
+        functionQuery: { expressionName: 'fetchExpr', kind: 'Sync' },
+      },
+      {
+        channelName: 'client_query_sync',
+        module: { name: TEST_MODULE_NAME, versionRange: '>=0.0.1', filePath: TEST_MODULE_PATH },
+        functionQuery: { methodName: 'query', kind: 'Sync' },
+      },
+    ])
+  })
+})
+
 describe('polyfill_cjs', () => {
   test('instruments with a custom dc module (cjs)', () => {
     runTest('polyfill_cjs', [