robotframework 4中的标头

*** Settings ***
Documentation    This is a sample test suite.
Library          SeleniumLibrary
Library          RequestsLibrary
Variables        variables.py
Suite Setup      Setup Test Environment
Suite Teardown   Tear Down Test Environment

*** Variables ***
${USERNAME}      admin
${PASSWORD}      123456

*** Test Cases ***
Login Test
    Open Browser    https://example.com    chrome
    Input Text      id=username            ${USERNAME}
    Input Text      id=password            ${PASSWORD}
    Click Button    xpath=//button[@id='login-button']
    Close Browser

*** Keywords ***
Setup Test Environment
    [Documentation]    This keyword sets up the test environment.
    Log    Test environment is being set up.

Tear Down Test Environment
    [Documentation]    This keyword tears down the test environment.
    Log    Test environment is being torn down.