dotnet/test/firefox/FirefoxDriverServiceTest.cs

// <copyright file="FirefoxDriverServiceTest.cs" company="Selenium Committers">
// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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using NUnit.Framework;
using System.IO;

namespace OpenQA.Selenium.Firefox;

[TestFixture]
public class FirefoxDriverServiceTest : DriverTestFixture
{
    [Test]
    public void ShouldRedirectGeckoDriverLogsToFile()
    {
        FirefoxOptions options = new FirefoxOptions();
        string logPath = Path.GetTempFileName();
        options.LogLevel = FirefoxDriverLogLevel.Trace;

        FirefoxDriverService service = FirefoxDriverService.CreateDefaultService();
        service.LogPath = logPath;

        IWebDriver driver2 = new FirefoxDriver(service, options);

        try
        {
            Assert.That(File.Exists(logPath), Is.True);
            string logContent = File.ReadAllText(logPath);
            Assert.That(logContent, Does.Contain("geckodriver"));
        }
        finally
        {
            driver2.Quit();
            File.Delete(logPath);
        }
    }

}