public async Task GetOrdersByUsernameAsync_WithUsernameAndPage_ShouldReturnValidServiceModel()
{
// Arrange
FitStoreDbContext database = this.Database;
DatabaseHelper.SeedData(database);
IAdminUserService adminUserService = new AdminUserService(database);
// Act
AdminUserOrdersServiceModel result = await adminUserService.GetOrdersByUsernameAsync(firstUsername, page);
// Assert
result.Username.Should().Be(firstUsername);
result.Address.Should().Be(firstAddress);
result.Email.Should().Be(firstEmail);
result.Orders.Count().Should().Be(2);
}