Improve relibiity in tests

Author: gericdong

genai/test/textgen-with-txt.test.js

@@ -23,8 +23,6 @@ const sample = require('../text-generation/textgen-with-txt.js');
 describe('textgen-with-txt', async () => {
   it('should generate text content from a text prompt', async () => {
     const output = await sample.generateContent(projectId);
-    assert(
-      output.length > 0 && output.includes('AI') && output.includes('models')
-    );
+    assert(output.length > 0 && output.includes('AI'));
   });
 });