fix: Make unit test less brittle and add CI

Author: jsonbailey

.github/workflows/server-ai-langchain.yml

@@ -0,0 +1,27 @@
+name: ai-providers/server-ai-langchain
+
+on:
+  push:
+    branches: [main, 'feat/**']
+    paths-ignore:
+      - '**.md' #Do not need to run CI for markdown changes.
+  pull_request:
+    branches: [main, 'feat/**']
+    paths-ignore:
+      - '**.md'
+
+jobs:
+  build-test-langchain-provider:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22.x
+          registry-url: 'https://registry.npmjs.org'
+      - id: shared
+        name: Shared CI Steps
+        uses: ./actions/ci
+        with:
+          workspace_name: '@launchdarkly/server-sdk-ai-langchain'
+          workspace_path: packages/ai-providers/server-ai-langchain

packages/ai-providers/server-ai-langchain/__tests__/LangChainProvider.test.ts

@@ -141,10 +141,7 @@ describe('LangChainProvider', () => {
 
       expect(result.metrics.success).toBe(false);
       expect(result.message.content).toBe('');
-      expect(mockLogger.warn).toHaveBeenCalledWith(
-        'Multimodal response not supported, expecting a string. Content type: object, Content:',
-        JSON.stringify({ type: 'image', data: 'base64data' }, null, 2),
-      );
+      expect(mockLogger.warn).toHaveBeenCalledTimes(1);
     });
 
     it('returns success=false for array content and logs warning', async () => {
@@ -156,10 +153,7 @@ describe('LangChainProvider', () => {
 
       expect(result.metrics.success).toBe(false);
       expect(result.message.content).toBe('');
-      expect(mockLogger.warn).toHaveBeenCalledWith(
-        'Multimodal response not supported, expecting a string. Content type: object, Content:',
-        JSON.stringify(['text', { type: 'image', data: 'base64data' }], null, 2),
-      );
+      expect(mockLogger.warn).toHaveBeenCalledTimes(1);
     });
   });