Karate中能否在if判断右侧使用call(once) read？求替代方案

需求背景 #

验证mvn/runner参数与单场景选项时遇到read调用相关问题。需求如下：

• 允许测试人员在运行时定义dataRow（用户账户信息），让当前feature文件使用专属认证
• 通过runner或mvn命令执行测试时，复用配置初始化阶段的认证结果，避免每个feature文件重复认证（该配置逻辑已正常工作）

本地可正常运行的认证前置代码 #

本地运行feature文件时，以下Background认证前置代码可正常执行：

Background: Authentication PreRequisites 
    * def dataSourceRow = karate.get('karate.dsRow', 1)
    * def dataSourceEnv = karate.get('karate.env', 'dev')
    * callonce read('../../../../service-config.js') { dsRow: '#(dataSourceRow)' , env: '#(dataSourceEnv)' }
    
    * if (skipDomainFlag) {karate.logger.debug('skipDomainFlag is set to true so Domain calls cannot be ran!'); karate.abort(); }
    * callonce read('classpath:adapters/domainsession.feature')

    * configure afterFeature = function(){ karate.call('classpath:adapters/logout.feature'); }

    * url baseUrlDomain + domainPath
    * configure headers = domainHeaders
    * header host = domainHost

尝试过的错误写法及问题 #

尝试在if语句中判断karate.dsRow是否传入，并调用read时，无法像单行调用那样正常工作，以下是几种尝试及报错情况：

1. 分两行写法 #

本地运行正常，但mvn/runner执行时提示ReferenceError: "domainAuth" is not defined

* if (!(karate.properties['karate.dsRow'])) domainAuth = read('classpath:adapters/domainsession.feature')
* callonce domainAuth

2. 两次if判断写法 #

分别出现语法错误（缺失闭合引号）和方法重载不匹配错误：
写法一：

* if (!(karate.properties['karate.dsRow'])) domainAuth = read('classpath:adapters/domainsession.feature')
* if (!(karate.properties['karate.dsRow'])) karate.callonce('#(domainAuth)')

写法二：

* if (!(karate.properties['karate.dsRow'])) domainAuth = read('classpath:adapters/domainsession.feature')
* if (!(karate.properties['karate.dsRow'])) karate.callonce(domainAuth)

3. 合并为单行if块写法 #

同样出现方法重载不匹配或语法错误：
写法一：

01: if (!(karate.properties['karate.dsRow'])) { domainAuth = read('classpath:adapters/domainsession.feature'); karate.callonce(domainAuth) }

写法二：

* if (!(karate.properties['karate.dsRow'])) { karate.set('domainAuth', karate.read('classpath:adapters/domainsession.feature')); karate.callonce('#(domainAuth)'); }

诉求 #

希望call(once) read能支持在if判断的右侧作为单行语句使用；若该方案不可行，求其他未尝试的替代方案。

本地测试示例代码 #

testUrl.feature #

Feature:

Scenario:
    * def testUrl = 'http://www.google.com'

test.feature #

Feature: Test for test call and callonce after a conditional
    Background: Authentication PreRequisites 
        * def testUrl = karate.get('karate.testUrl', 'http://www.bing.com')

        #**** Calls combined for troubleshooting of the call/callonce function after a conditional
        #***** uncomment only 1 of the below statements
        # * if (!(karate.properties['karate.testUrl'])) { karate.set('testUrlFile', karate.read('testUrl.feature')); karate.call('#(testUrlFile)'); }
        # * if (!(karate.properties['karate.testUrl'])) { karate.set('testUrlFile', karate.read('testUrl.feature')); karate.call(testUrlFile); }
        # * if (!(karate.properties['karate.testUrl'])) { karate.set('testUrlFile', karate.read('testUrl.feature')); karate.callonce('#(testUrlFile)'); }
        # * if (!(karate.properties['karate.testUrl'])) { karate.set('testUrlFile', karate.read('testUrl.feature')); karate.callonce(testUrlFile); }

        #**** Calls separated for troubleshooting of the call/callonce function after a conditional
        # * if (!(karate.properties['karate.testUrl'])) { karate.set('testUrlFile', karate.read('testUrl.feature')) } 
        # * if (!(karate.properties['karate.testUrl'])) { karate.log('testUrlFile is ',testUrlFile) } 
            #***** uncomment only 1 of the below statements to accompany the above 2 lines
            # * if (testUrlFile) { karate.call('#(testUrlFile)'); }
            # * if (testUrlFile) { karate.call(testUrlFile); }
            # * if (testUrlFile) { karate.callonce('#(testUrlFile)'); }
            # * if (testUrlFile) { karate.callonce(testUrlFile); }

        * url testUrl

    Scenario:
        Given path '/'
        When method GET
        Then status 200

内容的提问来源于stack exchange，提问作者mike