Update prompts and fix typo in evaluation script

Added clarification about zero-based indexing for OutputDataFrame tests in SYSTEM_PROMPT_testing.md. Fixed a typo in the evaluation script ('create_app_ficture' to 'create_app_fixture') for app_04_custom_app_name instructions.

Author: karangattu

shiny/pytest/_generate/_data/_prompts/SYSTEM_PROMPT_testing.md

@@ -50,6 +50,10 @@ For non-Shiny Python code, respond: "This framework is for Shiny for Python only
 
 10. **Newline at End**: Always end files with a newline.
 
+**11. DataFrames:** OutputDataFrame tests use **zero-based indexing**, so
+`data_grid.expect_cell(value="Action Button", row=0, col=0)`
+verifies the cell in the first row and first column, not the headers.
+
 ## Examples
 
 ### Checkbox Group

tests/inspect-ai/scripts/evaluation.py

@@ -89,7 +89,7 @@ def get_app_specific_instructions(app_name: str) -> str:
         """,
         "app_04_custom_app_name": """
         For this app, focus on:
-        - Ensure that the create_app_ficture is called with the correct app file. In this case, it should be "app_input_checkbox_group.py"
+        - Ensure that the create_app_fixture is called with the correct app file. In this case, it should be "app_input_checkbox_group.py"
         - Ensure that the test creates an instance of the InputCheckboxGroup controller with id "colors"
         - Ensure that the checkbox group component is verified for its label, choices, selected values, inline state, and width.
         - Ensure that the test checks the checkbox group state changes and verifies the output text accordingly.