refactor: added a buncha tests

allstarr.Tests/FuzzyMatcherTests.cs

@@ -0,0 +1,162 @@
+using Xunit;
+using allstarr.Services.Common;
+
+namespace allstarr.Tests;
+
+public class FuzzyMatcherTests
+{
+
+    [Theory]
+    [InlineData("Mr. Brightside", "Mr. Brightside", 100)]
+    [InlineData("Mr Brightside", "Mr. Brightside", 100)]
+    [InlineData("Mr. Brightside", "Mr Brightside", 100)]
+    [InlineData("The Killers", "Killers", 85)]
+    [InlineData("Dua Lipa", "Dua-Lipa", 100)]
+    public void CalculateSimilarity_ExactAndNearMatches_ReturnsHighScore(string str1, string str2, int expectedMin)
+    {
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= expectedMin, $"Expected score >= {expectedMin}, got {score}");
+    }
+
+    [Theory]
+    [InlineData("Mr. Brightside", "Somebody Told Me", 20)]
+    [InlineData("The Killers", "The Beatles", 40)]
+    [InlineData("Hot Fuss", "Sam's Town", 20)]
+    public void CalculateSimilarity_DifferentStrings_ReturnsLowScore(string str1, string str2, int expectedMax)
+    {
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score <= expectedMax, $"Expected score <= {expectedMax}, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_IgnoresPunctuation()
+    {
+        // Arrange
+        var str1 = "Don't Stop Believin'";
+        var str2 = "Dont Stop Believin";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 95, $"Expected high score for punctuation differences, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_IgnoresCase()
+    {
+        // Arrange
+        var str1 = "Mr. Brightside";
+        var str2 = "mr. brightside";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.Equal(100, score);
+    }
+
+    [Fact]
+    public void CalculateSimilarity_HandlesArticles()
+    {
+        // Arrange
+        var str1 = "The Killers";
+        var str2 = "Killers";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 80, $"Expected high score when 'The' is removed, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_HandlesFeaturedArtists()
+    {
+        // Arrange
+        var str1 = "Song Title (feat. Artist)";
+        var str2 = "Song Title";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 70, $"Expected decent score for featured artist variations, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_HandlesRemixes()
+    {
+        // Arrange
+        var str1 = "Song Title - Radio Edit";
+        var str2 = "Song Title";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 70, $"Expected decent score for remix/edit variations, got {score}");
+    }
+
+    [Theory]
+    [InlineData("", "", 0)]
+    [InlineData("Test", "", 0)]
+    [InlineData("", "Test", 0)]
+    public void CalculateSimilarity_EmptyStrings_ReturnsZero(string str1, string str2, int expected)
+    {
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.Equal(expected, score);
+    }
+
+    [Fact]
+    public void CalculateSimilarity_TokenOrder_DoesNotMatter()
+    {
+        // Arrange
+        var str1 = "Bright Side Mr";
+        var str2 = "Mr Bright Side";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 90, $"Expected high score regardless of token order, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_PartialTokenMatch_ReturnsModerateScore()
+    {
+        // Arrange
+        var str1 = "Mr. Brightside";
+        var str2 = "Mr. Brightside (Live)";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 70 && score < 100, $"Expected moderate score for partial match, got {score}");
+    }
+
+    [Fact]
+    public void CalculateSimilarity_SpecialCharacters_AreNormalized()
+    {
+        // Arrange
+        var str1 = "Café del Mar";
+        var str2 = "Cafe del Mar";
+
+        // Act
+        var score = FuzzyMatcher.CalculateSimilarity(str1, str2);
+
+        // Assert
+        Assert.True(score >= 90, $"Expected high score for accented characters, got {score}");
+    }
+
+}