I’m working on a test in Karate where I need to upload an Excel file to an API. The challenge is that each test run should generate a unique file name to avoid conflicts (e.g., to prevent 409 Conflict errors).

My Scenario:
Original Setup:

The original Excel file is located in src/test/resources/testdata/sample.xlsx.
I need to generate a unique file name (e.g., sample_<UUID>.xlsx) and copy the original file to a temporary directory with this new name.
After copying, I need to upload this newly named file via an API endpoint and then clean up the file.

Problems Encountered:
It will create the file in the desired location with the new name, yet it gives me file not found exception most likely at the below line is what I guess
And multipart file file = { read: '#(newFilePath)', filename: '#(newFileName)', contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }

Karate Test:

Feature: File Upload Endpoint with Dynamic File Name

Background:
* def UUID = Java.type('java.util.UUID')
* def Files = Java.type('java.nio.file.Files')
* def Paths = Java.type('java.nio.file.Paths')
* def StandardCopyOption = Java.type('java.nio.file.StandardCopyOption')
* def System = Java.type('java.lang.System')

# Function to generate a unique file name
* def generateUniqueFileName =
  """
  function() {
    var uuid = UUID.randomUUID().toString();
    return 'sample_' + uuid + '.xlsx';
  }
  """

# Function to copy file with a new name to a specific directory
* def copyFileWithNewName =
  """
  function(sourcePath, targetDir, newFileName) {
    var sourceFile = Paths.get(sourcePath);
    var targetPath = Paths.get(targetDir, newFileName);
    Files.createDirectories(targetPath.getParent());
    Files.copy(sourceFile, targetPath, StandardCopyOption.REPLACE_EXISTING);
    return targetPath.toString();
  }
  """

# Set up paths
* def projectDir = System.getProperty('user.dir')
* def originalFilePath = projectDir + '/src/test/resources/testdata/sample.xlsx'
* def targetDir = projectDir + '/src/test/resources/testdata/temp'

# Generate a new file name and copy the file
* def newFileName = generateUniqueFileName()
* def newFilePath = copyFileWithNewName(originalFilePath, targetDir, newFileName)
* print 'New file created at:', newFilePath

Scenario: Upload an Excel file
Given url 'http://localhost:8080/upload/file'
And multipart file file = { read: '#(newFilePath)', filename: '#(newFileName)', contentType: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' }
When method post
Then status 202
And match response == 'File uploaded successfully'

# Clean up: delete the temporary file
* eval Files.deleteIfExists(Paths.get(newFilePath))
* print 'Temporary file deleted:', newFilePath