public void AlertScreen_WhenOnePurchaserCompletesTransaction()
{
// Arrange
var alertScreenForCompletedPurchaser = new Mock <IAlertScreen>();
var alertScreenForActivePurchaser = new Mock <IAlertScreen>();
var completedPurchaser = new Purchaser(alertScreenForCompletedPurchaser.Object, _mediator);
var activePurchaser = new Purchaser(alertScreenForActivePurchaser.Object, _mediator);
// Act
_mediator.AddPurchaser(completedPurchaser);
_mediator.AddPurchaser(activePurchaser);
completedPurchaser.Complete(_product);
// Assert
using (new FluentAssertions.Execution.AssertionScope("purchaser"))
{
alertScreenForActivePurchaser.Verify(sc => sc.ShowMessage(_product.Item, _product.Location));
alertScreenForCompletedPurchaser.Verify(sc => sc.ShowMessage(It.IsAny <string>(), It.IsAny <string>()), Times.Never);
}
}