/// <summary>
        /// Asserts that the specification is met.
        /// </summary>
        /// <param name="builder">The specification builder.</param>
        /// <param name="comparer">The result comparer.</param>
        public static void Assert(this IResultCentricAggregateQueryTestSpecificationBuilder builder,
            IResultComparer comparer)
        {
            if (builder == null) throw new ArgumentNullException("builder");
            if (comparer == null) throw new ArgumentNullException("comparer");
            var specification = builder.Build();
            var runner = new ResultCentricAggregateQueryTestRunner(comparer);
            var result = runner.Run(specification);
            if (result.Failed)
            {
                if (result.ButException.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0}", result.ButException.Value);

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.AssertException(writer.ToString());
#endif
                    }
                }

                if (result.ButResult.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0}", result.ButResult.Value);

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.AssertException(writer.ToString());
#endif
                    }
                }

                if (result.ButEvents.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0} event(s) ({1})",
                            result.ButEvents.Value.Length,
                            String.Join(",", result.ButEvents.Value.Select(_ => _.GetType().Name).ToArray()));

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.AssertException(writer.ToString());
#endif
                    }
                }
            }
        }
        /// <summary>
        /// Asserts that the specification is met.
        /// </summary>
        /// <param name="builder">The specification builder.</param>
        /// <param name="comparer">The result comparer.</param>
        public static void Assert(this IResultCentricAggregateQueryTestSpecificationBuilder builder,
                                  IResultComparer comparer)
        {
            if (builder == null)
            {
                throw new ArgumentNullException("builder");
            }
            if (comparer == null)
            {
                throw new ArgumentNullException("comparer");
            }
            var specification = builder.Build();
            var runner        = new ResultCentricAggregateQueryTestRunner(comparer);
            var result        = runner.Run(specification);

            if (result.Failed)
            {
                if (result.ButException.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0}", result.ButException.Value);

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.XunitException(writer.ToString());
#endif
                    }
                }

                if (result.ButResult.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0}", result.ButResult.Value);

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.XunitException(writer.ToString());
#endif
                    }
                }

                if (result.ButEvents.HasValue)
                {
                    using (var writer = new StringWriter())
                    {
                        writer.WriteLine("  Expected: {0},", result.Specification.Then);
                        writer.WriteLine("  But was:  {0} event(s) ({1})",
                                         result.ButEvents.Value.Length,
                                         String.Join(",", result.ButEvents.Value.Select(_ => _.GetType().Name).ToArray()));

#if NUNIT
                        throw new NUnit.Framework.AssertionException(writer.ToString());
#elif XUNIT
                        throw new Xunit.Sdk.XunitException(writer.ToString());
#endif
                    }
                }
            }
        }
 public void SetUp()
 {
     _comparer = new EqualsResultComparer();
     _sut      = new ResultCentricAggregateQueryTestRunner(_comparer);
 }
 public void SetUp()
 {
     _comparer = new EqualsResultComparer();
     _sut = new ResultCentricAggregateQueryTestRunner(_comparer);
 }