CarServiceContextInitTests_ctor.cs

  [TestClass]
  public class CarServiceContextInitTests
  {
      // to have the same Configuration object as in Startup
      private IConfigurationRoot _configuration;

      // represents database's configuration
      private DbContextOptions<CarServiceContext> _options;

      public CarServiceContextInitTests()
      {
          var builder = new ConfigurationBuilder()
              .SetBasePath(Directory.GetCurrentDirectory())
              .AddJsonFile("appsettings.json");

          _configuration = builder.Build();
          _options = new DbContextOptionsBuilder<CarServiceContext>()
              .UseSqlServer(_configuration.GetConnectionString("DefaultConnection"))
              .Options;
      }
   }