public void GetCostumersAsync_Test()
{
Mock <IOptions <DatabaseConfig> > optionsMock = new Mock <IOptions <DatabaseConfig> >();
optionsMock.SetupGet(o => o.Value).Returns(new DatabaseConfig()
{
ConnectionString = "conString"
});
ICustomerQueries queries = new CustomerQueries(optionsMock.Object);
Task queryTask = Task.Run(() => queries.GetCostumersAsync(0, 10));
}