
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "AddProduct sets correct quantity for new product")] 
        public void AddProduct_NewProduct_SetsQuantity() 
        {
            var manager = new InventoryManager();
            manager.AddProduct("Milk", 15);
            Assert.True(manager.inventory.ContainsKey("Milk"), "Product 'Milk' should be added to inventory.");
            Assert.Equal(15, manager.inventory["Milk"]);
        }

        [Fact(DisplayName = "AddProduct increases quantity for existing product")]
        public void AddProduct_ExistingProduct_IncreasesQuantity()
        {
            var manager = new InventoryManager();
            manager.AddProduct("Eggs", 5);
            manager.AddProduct("Eggs", 3);
            Assert.Equal(8, manager.inventory["Eggs"]);
        }

        [Fact(DisplayName = "RestockProduct increases quantity for existing product")]
        public void RestockProduct_ExistingProduct_IncreasesQuantity()
        {
            var manager = new InventoryManager();
            manager.AddProduct("Bread", 2);
            manager.RestockProduct("Bread", 4);
            Assert.Equal(6, manager.inventory["Bread"]);
        }

        [Fact(DisplayName = "RestockProduct adds new product with correct quantity")]
        public void RestockProduct_NewProduct_AddsProduct()
        {
            var manager = new InventoryManager();
            manager.RestockProduct("Butter", 7);
            Assert.True(manager.inventory.ContainsKey("Butter"), "Product 'Butter' should be added when restocked.");
            Assert.Equal(7, manager.inventory["Butter"]);
        }

        [Fact(DisplayName = "GetOutOfStockProducts returns all products with zero quantity")]
        public void GetOutOfStockProducts_ReturnsZeroQuantityProducts()
        {
            var manager = new InventoryManager();
            manager.AddProduct("Juice", 0);
            manager.AddProduct("Soda", 5);
            manager.AddProduct("Water", 0);
            var result = manager.GetOutOfStockProducts();
            Assert.Contains("Juice", result);
            Assert.Contains("Water", result);
            Assert.DoesNotContain("Soda", result);
        }
    }
}

ProgramTests.cs

Master the essential C# collections, from basic lists to advanced dictionaries and sets. This course blends engaging theory with practical, real-world challenges to help you confidently use collections in your C# projects.

Explore the foundational C# collections: arrays and lists. Learn how to create, manipulate, and apply them to solve practical problems.

Delve into C# dictionaries and related collections for efficient key-based data storage and retrieval.

Discover C# sets and useful collection utilities for advanced data manipulation and analysis.

Challenge: Inventory Management System

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