Bills.Tests/Core/SeleneCollectionExtensions.cs

SeleneCollectionExtensions.cs

using OpenQA.Selenium;
using static NSelene.Selene;
using NSelene;
using OpenQA.Selenium.Interactions;
using System;
using NSelene.Conditions;
using System.Linq;
using System.Collections.Generic;

namespace Bills.Tests.Core
{
    public static class SeleneCollectionExtensions 
    {
        public static int IndexOfElementBy(this SeleneCollection collection, Condition<SeleneElement> condition, int amongExpectedOfNumber=-1)
        {
            if (amongExpectedOfNumber>0) 
            {
                collection.Should(Have.Count(amongExpectedOfNumber));
            }

            collection.FindBy(condition).Should(Be.InDom);

            return ((IEnumerable<SeleneElement>)collection)
                .Select((Value, Index) => new {Value, Index})
                .Single(its => condition.Apply(its.Value))
                .Index;
        }
    }
}