
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "AddContact adds new contact with correct number")] 
        public void AddContact_AddsContactCorrectly() {
            var phonebook = new Dictionary<string, string>();
            Program.AddContact(phonebook, "Eve", "555-0000");
            Assert.True(phonebook.ContainsKey("Eve"), "Contact 'Eve' should be added to the phonebook");
            Assert.Equal("555-0000", phonebook["Eve"]);
        }

        [Fact(DisplayName = "SearchContact returns correct number for existing contact")] 
        public void SearchContact_ReturnsCorrectNumber() {
            var phonebook = new Dictionary<string, string> { {"Frank", "555-1111"} };
            string result = Program.SearchContact(phonebook, "Frank");
            Assert.Equal("555-1111", result);
        }

        [Fact(DisplayName = "SearchContact returns 'Contact not found' for missing contact")] 
        public void SearchContact_ReturnsContactNotFound() {
            var phonebook = new Dictionary<string, string> { {"Grace", "555-2222"} };
            string result = Program.SearchContact(phonebook, "Hank");
            Assert.Equal("Contact not found", result);
        }

        [Fact(DisplayName = "DeleteContact returns true and removes contact when contact exists")] 
        public void DeleteContact_DeletesContact() {
            var phonebook = new Dictionary<string, string> { {"Ivy", "555-3333"} };
            bool deleted = Program.DeleteContact(phonebook, "Ivy");
            Assert.True(deleted, "DeleteContact should return true for existing contact");
            Assert.False(phonebook.ContainsKey("Ivy"), "Contact 'Ivy' should be removed from the phonebook");
        }

        [Fact(DisplayName = "DeleteContact returns false when contact does not exist")] 
        public void DeleteContact_ReturnsFalseForNonexistent() {
            var phonebook = new Dictionary<string, string> { {"Jack", "555-4444"} };
            bool deleted = Program.DeleteContact(phonebook, "Kate");
            Assert.False(deleted, "DeleteContact should return false for non-existent contact");
        }

        [Fact(DisplayName = "SearchContact returns 'Contact not found' after contact is deleted")] 
        public void SearchContact_AfterDelete_ReturnsContactNotFound() {
            var phonebook = new Dictionary<string, string> { {"Leo", "555-5555"} };
            Program.DeleteContact(phonebook, "Leo");
            string result = Program.SearchContact(phonebook, "Leo");
            Assert.Equal("Contact not found", 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: Phonebook Application

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Challenge: Phonebook Application

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