Fix tests

Author: gonzaloriestra

packages/theme/src/cli/utilities/repl/repl.test.ts

@@ -5,7 +5,7 @@ import {DevServerSession} from '../theme-environment/types.js'
 import {describe, expect, test, vi} from 'vitest'
 import {outputInfo} from '@shopify/cli-kit/node/output'
 
-import {createInterface} from 'readline'
+import {Interface} from 'readline'
 
 vi.mock('@shopify/cli-kit/node/output')
 vi.mock('./evaluator.js')
@@ -21,10 +21,15 @@ describe('handleInput', () => {
   }
   const themeId = '123'
   const url = '/'
-  const rl = createInterface({
-    input: process.stdin,
-    output: process.stdout,
-  })
+  // Use a stub Interface instead of a real readline created from process.stdin.
+  // In Node 26, readline.createInterface on a non-TTY stdin that is already
+  // at EOF (as in Vitest workers) immediately closes the Interface, and
+  // calling `prompt()` on a closed Interface throws `Error: readline was
+  // closed` (it was a silent no-op in Node 22/24).
+  const rl = {
+    prompt: vi.fn(),
+    close: vi.fn(),
+  } as unknown as Interface
 
   test('should call outputInfo if input has {{ delimiter', async () => {
     // Given