
using Xunit;
using System;
using System.Reflection;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Contact class has private fields for name, phone, and email")]
        public void Contact_HasPrivateFields()
        {
            var type = typeof(Contact);
            var nameField = type.GetField("name", BindingFlags.NonPublic | BindingFlags.Instance);
            var phoneField = type.GetField("phone", BindingFlags.NonPublic | BindingFlags.Instance);
            var emailField = type.GetField("email", BindingFlags.NonPublic | BindingFlags.Instance);

            Assert.True(nameField != null && nameField.IsPrivate, "Field 'name' should be private");
            Assert.True(phoneField != null && phoneField.IsPrivate, "Field 'phone' should be private");
            Assert.True(emailField != null && emailField.IsPrivate, "Field 'email' should be private");
        }

        [Fact(DisplayName = "Contact constructor assigns provided values correctly")]
        public void Contact_ConstructorAssignsValues()
        {
            var contact = new Contact("Bob Smith", "123-4567", "bob@email.com");
            var type = typeof(Contact);
            var nameValue = type.GetField("name", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(contact);
            var phoneValue = type.GetField("phone", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(contact);
            var emailValue = type.GetField("email", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(contact);
            Assert.Equal("Bob Smith", nameValue);
            Assert.Equal("123-4567", phoneValue);
            Assert.Equal("bob@email.com", emailValue);
        }

        [Fact(DisplayName = "GetName returns correct name value")]
        public void GetName_ReturnsName()
        {
            var contact = new Contact("Carol King", "999-8888", "carol@abc.com");
            Assert.Equal("Carol King", contact.GetName());
        }

        [Fact(DisplayName = "GetPhone returns correct phone value")]
        public void GetPhone_ReturnsPhone()
        {
            var contact = new Contact("David Lee", "777-0000", "david@xyz.com");
            Assert.Equal("777-0000", contact.GetPhone());
        }

        [Fact(DisplayName = "GetEmail returns correct email value")]
        public void GetEmail_ReturnsEmail()
        {
            var contact = new Contact("Eva Green", "555-1111", "eva@green.com");
            Assert.Equal("eva@green.com", contact.GetEmail());
        }
    }
}

ProgramTests.cs

Master the art of building robust C# classes through hands-on drills and engaging theory. Explore constructors, encapsulation, access modifiers, static classes, and more, with real-world inspired challenges.

Dive into the world of constructors in C#. Learn how to initialize objects, use constructor overloading, and apply best practices for flexible class instantiation.

Explore the principles of class design, encapsulation, and how to protect and organize data using access modifiers.

Learn how to use static classes and members for shared data and utility functionality in C#.

Delve into advanced class construction topics: composition vs inheritance, and refactoring structs into classes for more complex scenarios.

Challenge: Design a Contact Class

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Challenge: Design a Contact Class

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