Add project files.

PracticeCalendar.UnitTests/PracticeCalendar.UnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="6.7.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
+    <PackageReference Include="xunit" Version="2.4.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PracticeCalendar.Domain\PracticeCalendar.Domain.csproj" />
+  </ItemGroup>
+
+</Project>

PracticeCalendar.UnitTests/PracticeEventTest.cs

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+using FluentAssertions;
+using PracticeCalendar.Domain.Entities;
+
+namespace PracticeCalendar.UnitTests
+{
+    public class PracticeEventTest
+    {
+        string _eventTitle = "Event1";
+        string _eventDescription = "Description";
+
+        string _attendeeName = "Claudiu Farcas";
+        string _atendeeEmail = "claudiu.farcas@testingbee.com";
+
+        [Fact]
+        public void InitializeProperties()
+        {
+            var practiceEvent = new PracticeEvent(_eventTitle, _eventDescription);
+            practiceEvent.Title.Should().Be(_eventTitle);
+            practiceEvent.Description.Should().Be(_eventDescription);
+            practiceEvent.Attendees.Should().HaveCount(0);
+        }
+
+        [Fact]
+        public void InitializeWithNullShouldThrowException()
+        {
+            Action act = () => {
+                var practiceEvent = new PracticeEvent(null, _eventDescription);
+            };
+            act.Should().Throw<ArgumentNullException>();
+
+            act = () => {
+                var practiceEvent = new PracticeEvent(_eventTitle, null);
+            };
+            act.Should().Throw<ArgumentNullException>();
+
+            act = () => {
+                var practiceEvent = new PracticeEvent(string.Empty, _eventDescription);
+            };
+            act.Should().Throw<ArgumentException>();
+
+            act = () => {
+                var practiceEvent = new PracticeEvent(_eventTitle, string.Empty);
+            };
+            act.Should().Throw<ArgumentException>();
+        }
+
+        [Fact]
+        public void AddAttendeeToEvent()
+        {
+            var practiceEvent = new PracticeEvent(_eventTitle, _eventDescription);
+            var testAttendee = new Attendee(_attendeeName, _atendeeEmail);
+            practiceEvent.AddAttendee(testAttendee);
+            practiceEvent.Attendees.Should().HaveCount(1);
+        }
+    }
+}

PracticeCalendar.UnitTests/Usings.cs

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+global using Xunit;