C# + Puppeteer

Полный текст примера

using System;
using System.IO;
using System.Threading.Tasks;
using NUnit.Framework;
using OpenQA.Selenium;
using OpenQA.Selenium.Chrome;
using OpenQA.Selenium.Chromium;
using OpenQA.Selenium.Remote;
using PuppeteerSharp;

public class RTSTest
{
    [Test]
    public async Task TestPuppeteer()
    {
        // Arrange
        var browserFetcher = new BrowserFetcher();
        await browserFetcher.DownloadAsync();
        await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false });
        await using var page = await browser.NewPageAsync();
        await page.GoToAsync("https://react-test-selector.github.io/example-application-for-docs/");
        await page.EvaluateExpressionAsync(
            await File.ReadAllTextAsync(@"<path-to-script>\react-test-selector.js")
        );

        // Act
        var inputNode = await page.EvaluateExpressionHandleAsync(
            "rts.querySelector('Input').at(0).getDomElement()"
        ) as ElementHandle;
        await inputNode.TypeAsync("Text");

        // Assert
        var textNode = await page.EvaluateExpressionHandleAsync(
            "rts.querySelector('InputValueContent').at(0).getDomElement()"
        )  as ElementHandle;
        var text = await (await textNode.GetPropertyAsync("textContent")).JsonValueAsync();
        Assert.AreEqual(text, "Input value: Text");
    }
}