feat: update unit tests

Author: yiyuan-he

aws-distro-opentelemetry-node-autoinstrumentation/test/patches/aws/services/bedrock.test.ts

@@ -277,8 +277,18 @@ describe('BedrockRuntime', () => {
 
   describe('InvokeModel', () => {
     it('adds modelId to span', async () => {
-      const dummyModelId: string = 'ABCDEFGH';
-      const dummyBody: string = 'HGFEDCBA';
+      const dummyModelId: string = 'amazon.titan-text-express-v1';
+      const prompt = "Complete this text. It was the best of times it was the worst...";
+      const nativeRequest = {
+        inputText: prompt,
+        textGenerationConfig: {
+          maxTokenCount: 4096,
+          stopSequences: [],
+          temperature: 0,
+          topP: 1,
+        },
+      };
+      const dummyBody: string = JSON.stringify(nativeRequest);
 
       nock(`https://bedrock-runtime.${region}.amazonaws.com`).post(`/model/${dummyModelId}/invoke`).reply(200, {
         modelId: dummyModelId,