I have created an extension for unit-testing my own equality implementations.Is it a good approach in general to have such extensions for unit testing?What unit-testing extensions do you use?public static class EqualityExtensions    {        /// <summary>        /// Checks that all variations Equals method conforms to equality by properties        /// </summary>        /// <typeparam name=T></typeparam>        /// <param name=variations></param>        /// <param name=propertyAccessors>Property accessors specifying which properties contribute to equality</param>        /// <returns>True, if all instances from a set conform to property equality</returns>        /// <example>        /// Assert.IsTrue(from name in new[] {foo,bar} from count in new[] {1,2} select new MyClass{Name=name,Count=count}).ConformToPropertyEquality(x=>x.Name,x=>x.Count))        /// </example>        public static bool ConformToPropertyEquality<T>(this IEnumerable<T> variations, params Func<T, object>[] propertyAccessors)        {            var propertyComparisions =                from lhs in variations                from rhs in variations                select                    Equals(                        (from comparator in propertyAccessors select Equals(comparator(lhs), comparator(rhs))).All(c => c),                        Equals(lhs, rhs)                    );            return propertyComparisions.All(p => p);        }    }
Unit testing extension for equality testing
c#;unit testing
It's perfectly OK. As an example SharpTestEx is a whole library with such an extensions.