Fix tests

Author: lennartdohmann

dotnet/Vaas/test/Vaas.Test/Authentication/AuthenticatorTest.cs

@@ -224,6 +224,6 @@ await Assert.ThrowsAsync<AuthenticationException>(
         await Assert.ThrowsAsync<AuthenticationException>(
             () => _authenticator.GetTokenAsync(CancellationToken.None)
         );
-        sw.Elapsed.Should().BeGreaterOrEqualTo(TimeSpan.FromSeconds(1));
+        sw.Elapsed.Should().BeGreaterThanOrEqualTo(TimeSpan.FromSeconds(1));
     }
 }

dotnet/Vaas/test/Vaas.Test/Vaas.Test.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="DotNetEnv" Version="3.1.1" />
+    <PackageReference Include="FluentAssertions" Version="8.0.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.13.0" />
     <PackageReference Include="Moq.Contrib.HttpClient" Version="1.4.0" />
     <PackageReference Include="Snapshooter.Xunit" Version="1.0.1" />

dotnet/Vaas/test/Vaas.Test/VaasTest.cs

@@ -8,7 +8,6 @@
 using System.Net.Http.Json;
 using System.Reflection;
 using System.Security.Authentication;
-using System.Security.Cryptography;
 using System.Text;
 using System.Text.Json;
 using System.Threading;