
using Xunit;
using System;
using System.IO;

namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "Splits input string at each comma and prints each value on a new line")]
        public void PrintCsvValues_SplitsAndPrintsEachValueOnNewLine()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.PrintCsvValues("a, b, c");
            string output = sw.ToString().Trim();
            string[] lines = output.Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal(3, lines.Length);
            Assert.Contains("a", lines);
            Assert.Contains("b", lines);
            Assert.Contains("c", lines);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "Trims leading and trailing spaces from each value")]
        public void PrintCsvValues_TrimsSpaces()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.PrintCsvValues("  apple  , banana ,  cherry ");
            string output = sw.ToString().Trim();
            string[] lines = output.Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal("apple", lines[0]);
            Assert.Equal("banana", lines[1]);
            Assert.Equal("cherry", lines[2]);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "Handles input with no spaces between values")]
        public void PrintCsvValues_NoSpaces()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.PrintCsvValues("one,two,three");
            string output = sw.ToString().Trim();
            string[] lines = output.Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal("one", lines[0]);
            Assert.Equal("two", lines[1]);
            Assert.Equal("three", lines[2]);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }

        [Fact(DisplayName = "Handles input with extra spaces before or after values")]
        public void PrintCsvValues_ExtraSpaces()
        {
            var sw = new StringWriter();
            Console.SetOut(sw);

            Program.PrintCsvValues("  first , second,third ");
            string output = sw.ToString().Trim();
            string[] lines = output.Split(new[] { '\\n', '\\r' }, StringSplitOptions.RemoveEmptyEntries);
            Assert.Equal("first", lines[0]);
            Assert.Equal("second", lines[1]);
            Assert.Equal("third", lines[2]);
            Console.SetOut(new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = true });
        }
    }
}

ProgramTests.cs

Master the essentials of string manipulation, text parsing, and efficient text processing in C#. This course guides you from the basics of working with strings to advanced text analysis and formatting, using engaging real-world examples and hands-on challenges.

Explore the basics of strings in C#, including creation, concatenation, and essential properties. Practice manipulating and analyzing text with beginner-friendly challenges.

Advance your skills with string formatting, splitting, trimming, and replacing text. Tackle real-world parsing and formatting tasks.

Apply your string skills to analyze text, check for palindromes, perform frequency analysis, and implement basic ciphers.

Challenge: CSV Parser

Solution