| add_var_to_file | Adds a variable assignment to a file and creates a backup | 
| restore_file | Restores a file from its backup created by add_var_to_file | 
| read_env | Reads .env file and evaluates variable expressions in that context | 
| format_error | Formats error messages with decorative borders and includes command output | 
| flunk | Causes a test to fail with an optional error message | 
| mktouch | Creates a file and any necessary parent directories | 
| fixture_export_codebase | Export codebase source code at the latest commit to the destination directory | 
| fixture_prepare_dir | Prepares a directory for fixture use by removing existing content | 
| random_string | Generates a random alphanumeric string of specified length | 
| trim_file | Removes the last line from a file | 
| tui_run | Runs a TUI script with predefined answers, simulating user input |