C# Mocking Database.ExecuteSqlRaw

I am trying to mock the Database.ExecuteSqlCommand but it prompted me Unsupported expression Is there anyway that I can mock the repository to mock dBContext.Database.ExecuteSqlCommand

Repository.cs

    private readonly Mock<DBContext> _dbContextMock;

    public ShippingBulkRepositoryTest()
    {
        _dbContextMock = new Mock<DBContext>(new DbContextOptionsBuilder<DBContext>().Options);
        _repository = new Repository(_dbContextMock.Object);
    }

public async Task deleteAllRecords(CancellationToken cancellationToken)
{
     try
     {
         dBContext.Database.ExecuteSqlCommand("DELETE FROM bulk");
         dBContext.SaveChanges();
     } catch (Exception ex)
     {
         Console.WriteLine(ex);
     }
}

RepositoryTest

 [Fact]
 public async Task deleteAllRecords_should_call_GetAllSortedByPlateAsync_onto_service()
 {
     //given
     var bulk = _fixture.Build<bulk>()
         .With(x => x.id, 1)
         .With(x => x.type, "bulk")
         .CreateMany(1);
     //_dbContextMock.Setup(x => x.Database.ExecuteSqlRaw(It.IsAny<string>()));

     //when
     await _repository.deleteAllRecords(default);

     //then
     _dbContextMock.Verify(x => x.SaveChanges(), Times.Once);
 }

Error

Message: 
Value cannot be null. (Parameter 'databaseFacade')