Add initial snapshot testing

.gitignore

@@ -338,3 +338,6 @@ ASALocalRun/
 
 # Test Results
 /tests-results
+
+# Snapshot testing
+**/*.received.txt

src/Services/Enrolling/Enrolling.UnitTests/Domain/EnrollmentAggregateTests.cs

@@ -1,25 +1,24 @@
 using System;
+using System.Threading.Tasks;
 using Enrolling.UnitTests.Builders;
 using OpenCodeFoundation.ESchool.Services.Enrolling.Domain.AggregatesModel.EnrollmentAggregate;
+using VerifyXunit;
 using Xunit;
 
 namespace Enrolling.UnitTests.Domain
 {
+    [UsesVerify]
     public class EnrollmentAggregateTests
     {
         [Fact]
-        public void NewApplicationShouldSuccessWithValidInput()
+        public Task NewApplicationShouldSuccessWithValidInput()
         {
             var dto = new EnrollmentDtoBuilder()
                 .WithDefaults()
                 .Build();
 
             var enrollment = Enrollment.CreateNew(dto.Name!, dto.Email!, dto.Mobile!);
-
-            Assert.NotNull(enrollment);
-            Assert.Equal(dto.Name, enrollment.Name);
-            Assert.Equal(dto.Email, enrollment.EmailAddress);
-            Assert.Equal(dto.Mobile, enrollment.MobileNumber);
+            return Verifier.Verify(enrollment).UseDirectory("Snapshots");
         }
 
         [Fact]

src/Services/Enrolling/Enrolling.UnitTests/Domain/Snapshots/EnrollmentAggregateTests.NewApplicationShouldSuccessWithValidInput.verified.txt

@@ -0,0 +1,6 @@
+{
+  Id: Guid_1,
+  Name: John Doe,
+  EmailAddress: john@example.com,
+  MobileNumber: 01771999999
+}

src/Services/Enrolling/Enrolling.UnitTests/Enrolling.UnitTests.csproj

@@ -6,6 +6,7 @@
 	<ItemGroup>
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0"/>
 		<PackageReference Include="xunit" Version="2.4.1"/>
+    	<PackageReference Include="Verify.Xunit" Version="16.5.4" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
 			<PrivateAssets>all</PrivateAssets>
 			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>