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Testing JavaScript Injection Lifecycle Management in NW.js

This test suite validates the JavaScript injection functionality in NW.js, specifically focusing on the injection start and end behaviors using Selenium WebDriver for automation. The test ensures proper execution of injected scripts at different stages of the page load cycle.

Test Coverage Overview

The test coverage focuses on verifying the successful injection of JavaScript code at both the start and end of page loading processes.

Key areas tested include:

Window handle management and switching
JavaScript injection timing verification
Assertion of successful injection results
Browser automation integration points

Implementation Analysis

The testing approach utilizes Selenium WebDriver with Chrome options to automate browser interactions and verify JavaScript injection outcomes. The implementation employs a wait-and-verify pattern, using implicit waits and explicit element checks to ensure reliable test execution.

Technical patterns include:

Chrome WebDriver configuration with custom NW.js parameters
Window handle management utilities
Element presence verification with timeouts
Automated assertion checking

Technical Details

Testing tools and configuration:

Selenium WebDriver for browser automation
Chrome Options for NW.js app configuration
Custom utility functions for window management
Environment-based ChromeDriver path configuration
Python test runner with system path configuration

Best Practices Demonstrated

The test implementation showcases several testing best practices for browser automation and injection testing. Notable practices include:

Proper test cleanup with driver quit in finally block
Implicit wait implementation for improved stability
Modular utility function usage
Clear assertion messages and error handling
Structured window handle management

nwjs/nwJs

test/sanity/issue4286-inject-start-end/test.py

            
import time
import os
import sys
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from nw_util import *

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__)))

driver = webdriver.Chrome(executable_path=os.environ['CHROMEDRIVER'], chrome_options=chrome_options)
driver.implicitly_wait(5)
try:
    wait_window_handles(driver, 2)
    wait_switch_window_name(driver, 'index')
    print(driver.current_url)
    result = wait_for_element_id(driver, 'inject_start')
    print('inject_js_start: %s' % result)
    assert('success' in result)
    result = wait_for_element_id(driver, 'inject_end')
    print('inject_js_end: %s' % result)
    assert('success' in result)
finally:
    driver.quit()