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frontend/tests/thinkingLevels.test.ts

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+import { describe, expect, test } from 'vitest';
+import {
+  buildThinkingFromLevels,
+  readThinkingLevels,
+  THINKING_LEVELS,
+} from '../src/features/providers/thinkingLevels';
+
+describe('standard thinking level selector', () => {
+  test('only exposes levels recognized by the backend', () => {
+    expect(THINKING_LEVELS).toEqual([
+      'none',
+      'minimal',
+      'low',
+      'medium',
+      'high',
+      'xhigh',
+      'max',
+      'auto',
+    ]);
+  });
+
+  test('reads standard levels and legacy capability flags', () => {
+    expect(
+      readThinkingLevels({
+        levels: ['LOW', 'custom', 'high', 'none'],
+        zero_allowed: true,
+        dynamic_allowed: true,
+      })
+    ).toEqual(['none', 'low', 'high', 'auto']);
+  });
+
+  test('writes canonical backend levels and omits an empty selection', () => {
+    expect(buildThinkingFromLevels([])).toBeUndefined();
+    expect(buildThinkingFromLevels(['auto', 'high', 'none', 'low'])).toEqual({
+      levels: ['low', 'high', 'none', 'auto'],
+    });
+  });
+});