basic local test for js

tests/pass_through_tests/test_local_gemini.js

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+const { GoogleGenerativeAI, ModelParams, RequestOptions } = require("@google/generative-ai");
+
+const modelParams = {
+    model: 'gemini-pro',
+};
+  
+const requestOptions = {
+    baseUrl: 'http://127.0.0.1:4000/gemini'
+};
+  
+const genAI = new GoogleGenerativeAI("sk-1234"); // litellm proxy API key
+const model = genAI.getGenerativeModel(modelParams, requestOptions);
+
+const testPrompt = "Explain how AI works";
+
+async function main() {
+  console.log("making request")
+  try {
+    const result = await model.generateContent(testPrompt);
+    console.log(result.response.text());
+  } catch (error) {
+    console.error('Error details:', {
+      name: error.name,
+      message: error.message,
+      cause: error.cause,
+      // Check if there's a network error
+      isNetworkError: error instanceof TypeError && error.message === 'fetch failed'
+    });
+    
+    // Check if the server is running
+    if (error instanceof TypeError && error.message === 'fetch failed') {
+      console.error('Make sure your local server is running at http://localhost:4000');
+    }
+  }
+}
+
+
+async function main_streaming() {
+    try {
+        const streamingResult = await model.generateContentStream(testPrompt);
+        for await (const item of streamingResult.stream) {
+            console.log('stream chunk: ', JSON.stringify(item));
+        }
+        const aggregatedResponse = await streamingResult.response;
+        console.log('aggregated response: ', JSON.stringify(aggregatedResponse));
+    } catch (error) {
+        console.error('Error details:', error);
+    }
+}
+
+// main();
+main_streaming();