Remove extra instruction from system prompt generation

Eliminated the explicit instruction to use documented parameter names and keyword arguments from the system prompt in ShinyTestGenerator. The prompt now only includes the system prompt file and function reference documentation.

Author: karangattu

shiny/pytest/_generate/_main.py

@@ -146,17 +146,7 @@ def _read_system_prompt(self) -> str:
                 "System prompt file not found for app type: testing"
             )
 
-        # Add an explicit instruction to the system prompt to prefer documented
-        # parameter names and to always pass arguments as keyword arguments.
-        extra_instruction = (
-            "\n\nIMPORTANT: When generating test code, use the exact parameter names shown in the provided function reference documentation and pass all arguments as keyword arguments using those documented names. "
-            "Do not invent, rename, or reorder parameter names."
-        )
-
-        return (
-            f"{system_prompt_file}\n\nHere is the function reference documentation for Shiny for Python: {self.documentation}"
-            + extra_instruction
-        )
+        return f"{system_prompt_file}\n\nHere is the function reference documentation for Shiny for Python: {self.documentation}"
 
     def _resolve_model(self, model: str) -> str:
         """Resolve model alias to actual model name"""
@@ -324,6 +314,8 @@ def _create_test_prompt(self, app_text: str, app_file_name: str) -> str:
             "- If test is in 'tests/subdir/test_app.py' and app is in 'apps/subdir/app.py', use: '../../apps/subdir/app.py'\n"
             "- Always compute the correct relative path from the test file to the app file\n"
             "- NEVER use absolute paths or paths that aren't relative from the test location\n\n"
+            "CRITICAL: Generate only ONE comprehensive test function (e.g., 'test_app_functionality') that tests ALL components sequentially within the same test. "
+            "Do NOT create multiple separate test functions. Exercise all inputs and outputs in a single test flow.\n\n"
             "IMPORTANT: Only output the Python test code in a single code block. Do not include any explanation, justification, or extra text."
         )