Add project files.

TestingLib/Assert.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace TestingLib
+{
+    public class Assert
+    {
+        public static ObservableCollection<UnitTestInfo> TestResults { get; set; }
+
+        static Assert()
+        {
+            TestResults = new ObservableCollection<UnitTestInfo>();
+        }
+        public static void AreEqual(object first,
+            object second,
+            string message,
+            [CallerMemberName] string methodName = null)
+        {
+            var testInfo = new UnitTestInfo();
+            if (first.Equals(second))
+            {
+                testInfo.DidTestPass = true;
+            }
+            else
+            {
+                testInfo.DidTestPass = false;
+                testInfo.TestFailureMessage = message;
+            }
+            testInfo.MethodName = methodName;
+            TestResults.Add(testInfo);
+        }
+    }
+}

TestingLib/TestThePaymentDate.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using SUT = BrokerageLib;
+
+namespace TestingLib
+{
+    public class TestThePaymentDate
+    {
+        public UnitTestInfo DateIs30DaysInFuture()
+        {
+            var testInfo = new UnitTestInfo();
+
+            var pd = new SUT.PaymentSystem.PaymentDate();
+            var sampleDate = DateTime.Parse("2019-12-16");
+
+            var futureDate = pd.CalculateFuturePaymentDate(sampleDate);
+
+            if (futureDate.Equals(sampleDate.AddDays(30)))
+            {
+                testInfo.DidTestPass = true;
+            }
+            else
+            {
+                testInfo.DidTestPass = false;
+                testInfo.TestFailureMessage = $"Expected date is not 30 days in the future.";
+            }
+            testInfo.MethodName = "DateIs30DaysInFuture";
+            return testInfo;
+        }
+        public UnitTestInfo ReturnsMondayIfProposedIsSunday()
+        {
+            var testInfo = new UnitTestInfo();
+
+            var pd = new SUT.PaymentSystem.PaymentDate();
+            var sampleDate = DateTime.Parse("2019-12-17");
+
+            var futureDate = pd.CalculateFuturePaymentDate(sampleDate);
+
+            if (futureDate.DayOfWeek == DayOfWeek.Monday)
+            {
+                testInfo.DidTestPass = true;
+            }
+            else
+            {
+                testInfo.DidTestPass = false;
+                testInfo.TestFailureMessage = $"Expected date is not Monday.";
+            }
+
+            testInfo.MethodName = "ReturnsMondayIfProposedIsSunday";
+            return testInfo;
+        }
+        public UnitTestInfo ReturnsMondayIfProposedIsSaturday()
+        {
+            var testInfo = new UnitTestInfo();
+
+            var pd = new SUT.PaymentSystem.PaymentDate();
+            var sampleDate = DateTime.Parse("2019-12-15");
+
+            var futureDate = pd.CalculateFuturePaymentDate(sampleDate);
+
+            if (futureDate.DayOfWeek == DayOfWeek.Monday)
+            {
+                testInfo.DidTestPass = true;
+            }
+            else
+            {
+                testInfo.DidTestPass = false;
+                testInfo.TestFailureMessage = $"Expected date is not Monday.";
+            }
+
+            testInfo.MethodName = "ReturnsMondayIfProposedIsSaturday";
+            return testInfo;
+        }
+
+    }
+
+    public struct UnitTestInfo
+    {
+        public bool DidTestPass { get; set; }
+        public string TestFailureMessage { get; set; }
+        public string MethodName { get; set; }
+
+    }
+}

TestingLib/TestingLib.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\BrokerageLib\BrokerageLib.csproj" />
+  </ItemGroup>
+
+</Project>