public async Task GetAsync()
{
// Arrange
var controller = new AdministrationController(service);
controller.Request = new HttpRequestMessage();
controller.Configuration = new HttpConfiguration();
// Act
var result = await controller.GetCustomers();
// Assert
var value = default(IComposedModelResponse <Region>);
result.TryGetContentValue(out value);
Assert.IsNotNull(value.Model);
}