From 8b9072fa7ea3f09e6da3218c0251fc438482f249 Mon Sep 17 00:00:00 2001
From: Peter Steinberger <steipete@gmail.com>
Date: Thu, 25 Dec 2025 14:00:43 +0100
Subject: [PATCH] test: cover auto engine behavior

---
 tests/engine.test.ts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 tests/engine.test.ts

diff --git a/tests/engine.test.ts b/tests/engine.test.ts
new file mode 100644
index 0000000..cf5f614
--- /dev/null
+++ b/tests/engine.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import { resolveEngineMode, shouldUseSweetistics } from '../src/lib/engine.js';
+
+describe('engine', () => {
+  it('normalizes engine values and defaults to auto', () => {
+    expect(resolveEngineMode()).toBe('auto');
+    expect(resolveEngineMode('graphql')).toBe('graphql');
+    expect(resolveEngineMode('sweetistics')).toBe('sweetistics');
+    expect(resolveEngineMode('AUTO')).toBe('auto');
+    expect(resolveEngineMode('nope')).toBe('auto');
+  });
+
+  it('uses GraphQL as primary in auto mode', () => {
+    expect(shouldUseSweetistics('auto', false)).toBe(false);
+    expect(shouldUseSweetistics('auto', true)).toBe(false);
+  });
+
+  it('forces engine selection when explicitly set', () => {
+    expect(shouldUseSweetistics('sweetistics', false)).toBe(true);
+    expect(shouldUseSweetistics('graphql', true)).toBe(false);
+  });
+});