fix(runner): propagate chainable flags in describe.for (#10187)

DORI2001 · Dor Alagem · hi-ogawa · web-flow · commit db67831d7bbf · 2026-04-25T15:11:41.000+09:00
Co-authored-by: Dor Alagem &lt;doralagem@MacBook-Pro-sl-Dor.local&gt;
Co-authored-by: Hiroshi Ogawa &lt;hi.ogawa.zz@gmail.com&gt;
diff --git a/packages/runner/src/suite.ts b/packages/runner/src/suite.ts
@@ -707,13 +707,13 @@ function createSuite() {
   }
 
   suiteFn.for = function <T>(
-    this: {
-      withContext: () => SuiteAPI
-      setContext: (key: string, value: boolean | undefined) => SuiteAPI
-    },
+    this: SuiteAPI,
     cases: ReadonlyArray<T>,
     ...args: any[]
   ) {
+    const context = getChainableContext(this)
+    const suite = context.withContext()
+
     if (Array.isArray(cases) && args.length) {
       cases = formatTemplateString(cases, args)
     }
diff --git a/test/core/test/test-for-suite.test.ts b/test/core/test/test-for-suite.test.ts
@@ -33,3 +33,13 @@ describe.for([
     expect(a + b).matchSnapshot()
   })
 })
+
+// Regression test: describe.concurrent.for should propagate the concurrent flag
+// to the generated suites, matching how describe.for and test.concurrent.for behave.
+describe.concurrent.for([1, 2])('concurrent %i', (item) => {
+  test('is marked concurrent', ({ task }) => {
+    expect(task.suite!.concurrent).toBe(true)
+    expect(task.concurrent).toBe(true)
+    expect(item).toBeGreaterThan(0)
+  })
+})
