Install ReportPortal.Serilog NuGet package into your project with tests.
PS> Install-Package ReportPortal.Serilog
Add ReportPortal sink to logger.
using ReportPortal.Serilog;
using Serilog;
...
Log.Logger = new LoggerConfiguration().WriteTo.ReportPortal().CreateLogger();
...
And use logger to write log messages.
Log.Information("My log message");