
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "MergeAttendees returns all unique names from both lists")]
        public void MergeAttendees_ReturnsUniqueNames()
        {
            var event1 = new List<string> { "Alice", "Bob", "Charlie" };
            var event2 = new List<string> { "Dana", "Eve", "Frank" };
            var result = Program.MergeAttendees(event1, event2);
            var expected = new HashSet<string> { "Alice", "Bob", "Charlie", "Dana", "Eve", "Frank" };
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "MergeAttendees does not include duplicate names")]
        public void MergeAttendees_NoDuplicates()
        {
            var event1 = new List<string> { "Alice", "Bob", "Charlie" };
            var event2 = new List<string> { "Bob", "Charlie", "Dana" };
            var result = Program.MergeAttendees(event1, event2);
            var expected = new HashSet<string> { "Alice", "Bob", "Charlie", "Dana" };
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "MergeAttendees handles empty lists correctly")]
        public void MergeAttendees_HandlesEmptyLists()
        {
            var event1 = new List<string>();
            var event2 = new List<string> { "Alice", "Bob" };
            var result = Program.MergeAttendees(event1, event2);
            var expected = new HashSet<string> { "Alice", "Bob" };
            Assert.Equal(expected, result);

            event1 = new List<string> { "Charlie", "Dana" };
            event2 = new List<string>();
            result = Program.MergeAttendees(event1, event2);
            expected = new HashSet<string> { "Charlie", "Dana" };
            Assert.Equal(expected, result);
        }

        [Fact(DisplayName = "MergeAttendees returns empty set when both lists are empty")]
        public void MergeAttendees_BothListsEmpty()
        {
            var event1 = new List<string>();
            var event2 = new List<string>();
            var result = Program.MergeAttendees(event1, event2);
            Assert.Empty(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: Event Attendees Merger

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Challenge: Event Attendees Merger

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