Переписаны модули, тесты, обработка ошибок

Dockerfile

@@ -1,10 +1,11 @@
-# Build stage
+# Build stage
 FROM mcr.microsoft.com/dotnet/sdk:10.0-preview AS build
 WORKDIR /src
 
 # Copy solution and project files
 COPY ["Nashel.sln", "./"]
 COPY ["src/", "src/"]
+COPY ["tests/", "tests/"]
 
 # Restore dependencies
 RUN dotnet restore "Nashel.sln"