
using Xunit;
namespace ConsoleApp {
    public class ProgramTests {
        [Fact(DisplayName = "AnalyzeWordFrequencies returns correct frequencies for mixed case and punctuation")]
        public void AnalyzeWordFrequencies_CorrectlyCountsWords()
        {
            string paragraph = "Hello, world! Hello. HELLO? world; world";
            var result = Program.AnalyzeWordFrequencies(paragraph);
            Assert.Equal(3, result["hello"]);
            Assert.Equal(3, result["world"]);
            Assert.Equal(2, result.Count);
        }

        [Fact(DisplayName = "AnalyzeWordFrequencies returns empty dictionary for empty string")]
        public void AnalyzeWordFrequencies_EmptyString_ReturnsEmptyDictionary()
        {
            string paragraph = "";
            var result = Program.AnalyzeWordFrequencies(paragraph);
            Assert.Empty(result);
        }

        [Fact(DisplayName = "AnalyzeWordFrequencies ignores punctuation between and at end of words")]
        public void AnalyzeWordFrequencies_IgnoresPunctuation()
        {
            string paragraph = "cat, cat! dog? dog. dog;";
            var result = Program.AnalyzeWordFrequencies(paragraph);
            Assert.Equal(2, result["cat"]);
            Assert.Equal(3, result["dog"]);
            Assert.Equal(2, result.Count);
        }

        [Fact(DisplayName = "AnalyzeWordFrequencies treats words with different cases as the same word")]
        public void AnalyzeWordFrequencies_CaseInsensitive()
        {
            string paragraph = "Apple apple APPLE";
            var result = Program.AnalyzeWordFrequencies(paragraph);
            Assert.True(result.ContainsKey("apple"), "The dictionary should contain the key 'apple'.");
            Assert.Equal(3, result["apple"]);
            Assert.Equal(1, result.Count);
        }
    }
}

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: Word Frequency Analyzer

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