Web test code coverage without AQTime

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Retrieving window.__coverage__ in TestComplete (JavaScript)

TestComplete provides the ability to interact with browser content using Page and Eval methods. You can use this to fetch the coverage object.

Solution: Use Eval() to Retrieve window.__coverage__

Try the following JavaScript code in TestComplete:

function getCoverageData() {
    var page = Sys.Browser("chrome").Page("*");
    
    // Execute JavaScript in the browser context
    var coverageData = page.Eval("JSON.stringify(window.__coverage__)");
    
    if (coverageData) {
        Log.Message("Coverage Data Retrieved");
        Log.Message(coverageData); // Display the coverage JSON in the TestComplete log
        
        // Save to a file
        var fso = new ActiveXObject("Scripting.FileSystemObject");
        var file = fso.CreateTextFile("C:\\temp\\coverage.json", true);
        file.Write(coverageData);
        file.Close();
        
        Log.Message("Coverage data saved to C:\\temp\\coverage.json");
    } else {
        Log.Warning("No coverage data found. Ensure Istanbul is properly instrumented.");
    }
}

How This Works

1. Access the Browser Session
   • Sys.Browser("chrome").Page("*") gets the active page.
2. Extract window.__coverage__
   • Using Eval("JSON.stringify(window.__coverage__)") runs JavaScript in the browser.
3. Log & Save Coverage Data
   • Displays the JSON data in the TestComplete log.
   • Saves it to C:\temp\coverage.json for further analysis.

Next Steps

• Verify that your app is properly instrumented and window.__coverage__ is available.
• If using a different browser, replace "chrome" with "firefox" or "edge".
• Analyze the saved coverage.json using Istanbul's reporting tools:

npx nyc report --reporter=html

Then open coverage/index.html in your browser.