Groovy（SoapUI）中file.append写入CSV为何重复输出'hello world'？

Let me break down why you're seeing hello world hello world instead of a single entry in your CSV file:

Common Causes #

• Your script is running twice
  This is the most likely culprit. SoapUI can trigger script execution more than once in a few scenarios:
  • You’ve set your TestCase/TestSuite to run multiple times (check the execution settings in the top toolbar when you launch your tests).
  • The Groovy Script test step is duplicated in your TestCase, or you’ve placed the same file-writing code in both a Setup Script (for the TestCase/Suite) and a regular Test Step.
  • In rare cases, custom listeners or SoapUI plugins might be triggering extra executions, though this is far less common.
• Accidental duplicate triggers
  If you’re running tests manually, you might have clicked the run button twice without noticing, or the test runner is re-running failed steps automatically (double-check settings like "Run failed tests only").

How to Diagnose & Fix #

1. Add a log statement to confirm execution count
   Modify your script to log when it runs—this will show you exactly how many times it executes:

   log.info "Starting CSV write operation"
   def f = new File(project.rootPath + "/outputTest1.csv")
   f.append("hello world" + '\n')
   

   Check the Log tab in SoapUI; if you see two "Starting CSV write operation" entries, that confirms the script is running twice.

2. Audit your test structure

   • Walk through your TestCase steps: make sure you only have one Groovy Script step with this code.
   • Check the Setup Script and TearDown Script tabs for your TestCase/TestSuite—ensure the same file-writing code isn’t present there too.
   • Verify your run configuration: when you click "Run", check if the "Repeat Test" option is set to a number greater than 1.

3. Prevent duplicate writes if needed
   If you intentionally run the test multiple times but don’t want duplicate lines, you have two quick options:

   • Clear the file before writing (only do this if you don’t need to keep existing content):

     def f = new File(project.rootPath + "/outputTest1.csv")
     f.text = "hello world" + '\n' // Overwrites existing content instead of appending
     

   • Or add a check to only write if the line doesn’t already exist (great for preserving existing data):

     def f = new File(project.rootPath + "/outputTest1.csv")
     def content = f.text
     if (!content.contains("hello world")) {
         f.append("hello world" + '\n')
     }
     

内容的提问来源于stack exchange，提问作者Shaun Cromie