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Testing Web Worker Message Loop Implementation in NW.js

This test suite validates the message loop functionality in Web Workers within NW.js applications. It uses Selenium WebDriver to automate browser testing and verify proper worker communication implementation.

Test Coverage Overview

The test suite provides coverage for Web Worker message loop functionality in NW.js applications.

Key areas tested include:

Worker initialization and communication
Message passing between main thread and worker
Node.js integration with Web Workers
Success state verification

Implementation Analysis

The testing approach utilizes Selenium WebDriver with Chrome options specifically configured for NW.js testing. The implementation leverages Chrome’s WebDriver interface to automate browser interactions and validate worker behavior.

Key patterns include:

Custom Chrome options configuration
Implicit wait handling
DOM element verification
Proper resource cleanup

Technical Details

Testing tools and configuration:

Selenium WebDriver for browser automation
ChromeDriver for Chrome-specific testing
Custom NW.js arguments (–enable-node-worker)
Environment variable configuration for ChromeDriver path
Implicit wait timeout of 5 seconds

Best Practices Demonstrated

The test implementation showcases several testing best practices for automated browser testing.

Notable practices include:

Proper resource management with try/finally blocks
Explicit success criteria verification
Environment-independent path handling
Configurable driver options
Clear success/failure conditions

nwjs/nwJs

test/sanity/worker-msgloop/test.py

            
import time
import os

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
chrome_options = Options()
chrome_options.add_argument("nwapp=" + os.path.dirname(os.path.abspath(__file__)))
chrome_options.add_nw_argument("--enable-node-worker")

driver = webdriver.Chrome(executable_path=os.environ['CHROMEDRIVER'], chrome_options=chrome_options)
driver.implicitly_wait(5)
try:
    print(driver.current_url)
    result = driver.find_element_by_id('result').get_attribute('innerHTML')
    print(result)
    assert('success' in result)
finally:
    driver.quit()