BaseTestExecutionEngine.cs

public abstract class BaseTestExecutionEngine<TExecutionEngineAttribute> 
    : ITestExecutionEngine
    where TExecutionEngineAttribute : ExecutionEngineAttribute
{
    protected IDriver driver;      
    protected readonly IUnityContainer container;
    private bool isDisposed;

    public BaseTestExecutionEngine(IUnityContainer container)
    {
        this.container = container;
    }

    public void Dispose()
    {
        if (!this.isDisposed && this.driver != null)
        {
            this.driver.Quit();
            this.isDisposed = true;
        }
    }

    public bool IsSelected(MemberInfo memberInfo)
    {
        bool isSelectedOnMethodLevel = this.GetExecutionEngineTypeByMethodInfo(memberInfo);
        bool isSelectedOnClassLevel = this.GetExecutionEngineType(memberInfo.DeclaringType);

        return isSelectedOnMethodLevel || isSelectedOnClassLevel;
    }

    public abstract void RegisterDependencies(Browsers executionBrowserType);

    private bool GetExecutionEngineTypeByMethodInfo(MemberInfo memberInfo)
    {
        if (memberInfo == null)
        {
            throw new ArgumentNullException("The test method's info cannot be null.");
        }
        var executionEngineTypeMethodAttribute =
            memberInfo.GetCustomAttribute<ExecutionEngineAttribute>();
        if (executionEngineTypeMethodAttribute != null)
        {
            return true;
        }
        return false;
    }

    private bool GetExecutionEngineType(Type currentType)
    {
        if (currentType == null)
        {
            throw new ArgumentNullException("The test method's type cannot be null.");
        }

        var executionEngineClassAttribute = 
            currentType.GetCustomAttribute<ExecutionEngineAttribute>(true);
        if (executionEngineClassAttribute != null)
        {
            return true;
        }
        return false;
    }
}