BrowserLaunchTestBehaviorObserver.cs

public class BrowserLaunchTestBehaviorObserver : BaseTestBehaviorObserver
{
    protected override void PreTestInit(object sender, TestExecutionEventArgs e)
    {
        var browserType = this.GetExecutionBrowser(e.MemberInfo);
        Driver.StartBrowser(browserType);
    }

    protected override void PostTestCleanup(object sender, TestExecutionEventArgs e)
    {
        Driver.StopBrowser();
    }

    private BrowserTypes GetExecutionBrowser(MemberInfo memberInfo)
    {
        BrowserTypes result = BrowserTypes.Firefox;
        BrowserTypes classBrowserType = this.GetExecutionBrowserClassLevel(memberInfo.DeclaringType);
        BrowserTypes methodBrowserType = this.GetExecutionBrowserMethodLevel(memberInfo);
        if (methodBrowserType != BrowserTypes.NotSet)
        {
            result = methodBrowserType;
        }
        else if (classBrowserType != BrowserTypes.NotSet)
        {
            result = classBrowserType;
        }
        return result;
    }

    private BrowserTypes GetExecutionBrowserMethodLevel(MemberInfo memberInfo)
    {
        var executionBrowserAttribute = memberInfo.GetCustomAttribute<ExecutionBrowserAttribute>(true);
        if (executionBrowserAttribute != null)
        {
            return executionBrowserAttribute.BrowserType;
        }
        return BrowserTypes.NotSet;
    }

    private BrowserTypes GetExecutionBrowserClassLevel(Type type)
    {
        var executionBrowserAttribute = type.GetCustomAttribute<ExecutionBrowserAttribute>(true);
        if (executionBrowserAttribute != null)
        {
            return executionBrowserAttribute.BrowserType;
        }
        return BrowserTypes.NotSet;
    }
}