Test improvements (#64)

Author: Arnab-Developer

src/ApiHealthCheck.Lib/Settings/MailSettings.cs

@@ -10,4 +10,4 @@ public record MailSettings
     string UserName,
     string Password,
     string EnableSsl
-);
+);

test/ApiHealthCheck.ConsoleTest/ApiHealthCheck.ConsoleTest.csproj

@@ -8,8 +8,10 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="DeepCopy" Version="1.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
     <PackageReference Include="Moq" Version="4.16.1" />
+    <PackageReference Include="Tynamix.ObjectFiller" Version="1.5.7" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>