My office has roughly ~300 webpages that should be tested on a fairly regular basis. I'm working with Nunit, Selenium, and C# in Visual Studio 2010. I used this framework as a basis, and I do have a few working tests.

The problem I'm running into is is that when I run the entire suite. In each run, a random test(s) will fail. If they're run individually, they will all pass. My guess is that Nunit is trying to run all 7 tests at the same time and the browser can't support this for obvious reasons. Watching the browser visually, this does seem to be the case.

Looking at the screenshot below, I need to figure out a way in which the tests under Index_Tests are run sequentially, not in parallel.

errors:

Selenium2.OfficeClass.Tests.Index_Tests.index_4:
OpenQA.Selenium.NoSuchElementException : Unable to locate element: "method":"id","selector":"textSelectorName"}

Selenium2.OfficeClass.Tests.Index_Tests.index_7:
OpenQA.Selenium.NoSuchElementException : Unable to locate element: "method":"id","selector":"textSelectorName"}

example with one test:

using OpenQA.Selenium;
using NUnit.Framework;

namespace Selenium2.OfficeClass.Tests
{
    [TestFixture]
    public class Index_Tests : TestBase
    {
        public IWebDriver driver;

        [TestFixtureSetUp]
        public void TestFixtureSetUp()
        {
            driver = StartBrowser();
        }

        [TestFixtureTearDown]
        public void TestFixtureTearDown()
        {
            driver.Quit();
        }

        [Test]
        public void index_1()
        {
            OfficeClass index = new OfficeClass(driver);
            index.Navigate("http://url_goeshere");
            index.SendKeyID("txtFiscalYear", "input");
            index.SendKeyID("txtIndex", "");
            index.SendKeyID("txtActivity", "input");
            index.ClickID("btnDisplay");
        }
    }
}