test: add regression test for discuss-slice structured questions conditional

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/resources/extensions/gsd/tests/discuss-slice-structured-questions.test.ts

@@ -0,0 +1,46 @@
+/**
+ * Regression test for discuss-slice structured questions availability
+ *
+ * The guided-discuss-slice.md template must use the structuredQuestionsAvailable
+ * template variable to conditionally switch between ask_user_questions tool
+ * calls and plain-text questions, so the prompt works correctly when the
+ * structured questions tool is not available.
+ */
+
+import { describe, it } from 'node:test'
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import { resolve } from 'node:path'
+
+const template = readFileSync(
+  resolve(process.cwd(), 'src', 'resources', 'extensions', 'gsd', 'prompts', 'guided-discuss-slice.md'),
+  'utf-8',
+)
+
+describe('discuss-slice structuredQuestionsAvailable template variable', () => {
+  it('template references structuredQuestionsAvailable variable', () => {
+    assert.ok(
+      template.includes('{{structuredQuestionsAvailable}}'),
+      'guided-discuss-slice.md must use {{structuredQuestionsAvailable}} template variable',
+    )
+  })
+
+  it('template handles both true and false cases', () => {
+    const trueCase = template.includes('`{{structuredQuestionsAvailable}}` is `true`')
+    const falseCase = template.includes('`{{structuredQuestionsAvailable}}` is `false`')
+
+    assert.ok(trueCase, 'template must have a branch for structuredQuestionsAvailable=true')
+    assert.ok(falseCase, 'template must have a branch for structuredQuestionsAvailable=false')
+  })
+
+  it('false case instructs plain text questions', () => {
+    const falseIdx = template.indexOf('`{{structuredQuestionsAvailable}}` is `false`')
+    assert.ok(falseIdx !== -1)
+
+    const afterFalse = template.slice(falseIdx, falseIdx + 300)
+    assert.ok(
+      afterFalse.includes('plain text'),
+      'when structuredQuestionsAvailable is false, questions should be in plain text',
+    )
+  })
+})