Require exact generated certificate DER bytes

tests/Capi2Probe.Tests.ps1

@@ -17,6 +17,7 @@ try{
  $operation=[pscustomobject]@{Nonce=$nonce;CertificateDerBase64=[Convert]::ToBase64String($cert.Export([Security.Cryptography.X509Certificates.X509ContentType]::Cert));Subject=$cert.Subject;Thumbprint=$cert.Thumbprint;KeyEphemeral=$true;ProcessId=5678;ProcessName='pwsh.exe';StartedUtc=$now.AddSeconds(-1).ToString('o');CompletedUtc=$now.AddSeconds(1).ToString('o');Clock='GetSystemTimePreciseAsFileTime';RecordIdBefore=10;BeforeToken=$token;AfterToken=$token;Chain=[pscustomobject]@{Flags=2147492100;ErrorStatus=32;Chains=1;Elements=1}}
  $der=Assert-WelaCapi2ProbeCertificate $operation $nonce;Assert ($der.Length -gt 128) 'Generated test DER is validated.'
 }finally{if($cert){$cert.Dispose()};$rsa.Dispose()}
+$bad=Clone $operation;$bad.CertificateDerBase64=[Convert]::ToBase64String(([byte[]]([Convert]::FromBase64String($operation.CertificateDerBase64)+[byte[]]@(0))));Reject {Assert-WelaCapi2ProbeCertificate $bad $nonce} 'Reject trailing data after the actual certificate DER.'
 foreach($field in @('Nonce','Subject','Thumbprint','CertificateDerBase64')){$bad=Clone $operation;$bad.$field='wrong';Reject {Assert-WelaCapi2ProbeCertificate $bad $nonce} "Reject certificate $field mismatch"}
 foreach($value in @($false,'true',$null)){$bad=Clone $operation;$bad.KeyEphemeral=$value;Reject {Assert-WelaCapi2ProbeCertificate $bad $nonce} 'Ephemeral key evidence must be true Boolean.'}
 foreach($field in @('Flags','ErrorStatus','Chains','Elements')){$bad=Clone $operation;$bad.Chain.$field=0;Reject {Assert-WelaCapi2ProbeCertificate $bad $nonce} "Reject unexpected native chain $field"}