test: add unit tests for LiteLLM provider

Author: RheagalFire

packages/api/test/litellm-provider.test.mts

@@ -0,0 +1,32 @@
+import { describe, it, expect } from 'vitest';
+import { AiProvider, defaultModels, isValidProvider, getDefaultModel } from '../../shared/src/ai.mjs';
+
+describe('LiteLLM provider registration', () => {
+  it('should include litellm in AiProvider enum', () => {
+    expect(AiProvider.LiteLLM).toBe('litellm');
+  });
+
+  it('should have a default model for litellm', () => {
+    expect(defaultModels[AiProvider.LiteLLM]).toBeDefined();
+    expect(defaultModels[AiProvider.LiteLLM]).toBe('gpt-4o-mini');
+  });
+
+  it('should validate litellm as a valid provider', () => {
+    expect(isValidProvider('litellm')).toBe(true);
+  });
+
+  it('should return default model for litellm', () => {
+    expect(getDefaultModel('litellm')).toBe('gpt-4o-mini');
+  });
+
+  it('should not break existing providers', () => {
+    expect(isValidProvider('openai')).toBe(true);
+    expect(isValidProvider('anthropic')).toBe(true);
+    expect(isValidProvider('custom')).toBe(true);
+    expect(isValidProvider('openrouter')).toBe(true);
+  });
+
+  it('should reject invalid providers', () => {
+    expect(isValidProvider('nonexistent')).toBe(false);
+  });
+});