/src/Should.Fluent/Model/BeMethodCallExpression.cs

using System.Linq.Expressions;



namespace Should.Fluent.Model

{

    public static class BeMethodCallExpressionExtensions

    {

        public static MethodCallExpression Equal(this IBe<MethodCallExpression> be, MethodCallExpression expectedCall)

        {

            return be.Should.Apply(

                (t, a) =>

                {

                    if (GetMethodsAreUnEqual(expectedCall, t))

                    {

                        a.Fail("Expected method calls to be equal, but they were not.");

                    }

                },

                (t, a) =>

                {

                    if (GetMethodsAreUnEqual(expectedCall, t) == false)

                    {

                        a.Fail("Expected method calls to be equal, but they were not.");

                    }

                });

        }



        private static bool GetMethodsAreUnEqual(MethodCallExpression expectedCall, MethodCallExpression target)

        {

            var bothNull = target == null && expectedCall == null;

            return !bothNull &&

                   (target == null || expectedCall == null || !target.Method.Equals(expectedCall.Method) || !AllArgsAreEqual(expectedCall, target));

        }



        private static bool AllArgsAreEqual(MethodCallExpression expectedCall, MethodCallExpression target)

        {

            for (var i = 0; i < target.Arguments.Count; i++)

            {

                var targetArgValue = Expression.Lambda(target.Arguments[i]).Compile().DynamicInvoke();

                var expectedArgValue = Expression.Lambda(expectedCall.Arguments[i]).Compile().DynamicInvoke();

                var bothNull = targetArgValue == null && expectedArgValue == null;

                if (!bothNull && (targetArgValue == null ||  expectedArgValue == null || !targetArgValue.Equals(expectedArgValue)))

                {

                    return false;

                }

            }

            return true;

        }

    }

}