Sometimes in order to test one logical concern you need to use multiple asserts. This class helps with that.

MultiAssert.cs

    /// <summary>
    /// The multi assert.
    /// </summary>
    /// <remarks>
    /// Sometimes in order to test one logical concern you need to use 
    /// multiple asserts. This class helps with that.
    /// </remarks>
    public static class MultiAssert
    {
        /// <summary>
        /// The aggregate.
        /// </summary>
        /// <param name="actions">The actions.</param>
        /// <exception cref="Microsoft.VisualStudio.TestTools.UnitTesting.AssertFailedException">exception</exception>
        /// <exception cref="AssertFailedException">exception </exception>
        [DebuggerStepThrough]
        public static void Aggregate(params Action[] actions)
        {
            var exceptions = new List<AssertFailedException>();

            foreach (Action action in actions)
            {
                try
                {
                    action();
                }
                catch (AssertFailedException ex)
                {
                    exceptions.Add(ex);
                }
            }

            IEnumerable<string> assertionTexts =
                exceptions.Select(assertFailedException => assertFailedException.Message);
            IList<string> assertionTextsList = assertionTexts as IList<string> ?? assertionTexts.ToList();
            if (0 != assertionTextsList.Count())
            {
                throw new AssertFailedException(
                    assertionTextsList.Aggregate(
                        (aggregatedMessage, next) => aggregatedMessage + Environment.NewLine + next));
            }
        }
    }