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Testing JavaScript Binary Compilation and Buffer Handling in NW.js

This test suite validates the NW.js binary compilation and buffer handling functionality using Selenium WebDriver. It tests the compilation of JavaScript files to binary format and verifies their execution in a NW.js environment through automated browser interactions.

Test Coverage Overview

The test suite provides comprehensive coverage of NW.js JavaScript compilation (nwjc) and buffer handling capabilities.

Tests compilation of multiple script types: path, buffer, arraybuffer, and ajax
Validates binary file generation and execution
Verifies successful evaluation of compiled scripts in NW.js runtime
Ensures proper buffer handling across different data types

Implementation Analysis

The testing approach utilizes Selenium WebDriver to automate browser interactions and validate compiled script execution. The implementation follows a systematic pattern of compiling JavaScript files to binary format using nwjc, then evaluating them in a controlled NW.js environment.

Uses Chrome WebDriver for browser automation
Implements script compilation verification
Employs dynamic element selection for result validation
Handles process management for compilation tasks

Technical Details

Python testing framework with Selenium WebDriver
Chrome Options configuration for NW.js app testing
Subprocess management for nwjc compilation
Environment variable integration for ChromeDriver path
Dynamic test execution across multiple script types
Automated result verification through DOM manipulation

Best Practices Demonstrated

The test implementation showcases several testing best practices for NW.js application validation.

Proper resource cleanup with driver.quit()
Robust error handling with try-finally blocks
Systematic script compilation verification
Clear separation of compilation and execution phases
Efficient test organization with reusable script lists
Automated assertion of success conditions

nwjs/nwJs

test/sanity/issue5220-nwjc-buffer/test.py

            
import time
import os
import subprocess

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

testdir = os.path.dirname(os.path.abspath(__file__))
# nwdist = os.path.dirname(os.environ['CHROMEDRIVER'])
nwdist = os.path.join(os.path.dirname(os.environ['CHROMEDRIVER']), 'nwdist')

script_list = ['path', 'buffer', 'arraybuffer', 'ajax']

for script in script_list:
  script_path = os.path.join(testdir, script)
  child = subprocess.Popen([os.path.join(nwdist, 'nwjc'), script_path + '.js', script_path + '.bin'])
  child.wait()

chrome_options = Options()
chrome_options.add_argument("nwapp=" + testdir)

driver = webdriver.Chrome(executable_path=os.environ['CHROMEDRIVER'], chrome_options=chrome_options)
driver.implicitly_wait(2)
try:
    print(driver.current_url)
    for script in script_list:
      driver.find_element_by_id('eval-%s' % script).click()
      result = driver.find_element_by_id('%s-result' % script).get_attribute('innerHTML')
      print(result)
      assert("success" in result)
finally:
    driver.quit()