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tests/GeneIndexerTest.cs

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+using NUnit.Framework;
+
+namespace InverseOfLife.Test;
+
+[TestFixture]
+public class GeneIndexerTests
+{
+    [Test]
+    public void Indexer_GranularityPositive_ReadWriteBytes()
+    {
+        var riboseSequence = new byte[] { 0b10101010, 0b11110000, 0b00001111, 0b11001100 };
+        var gene = new Gene(3, riboseSequence); 
+
+        byte[] expected = [0b00001111, 0b11001100];
+        Assert.That(gene[1], Is.EqualTo(expected));
+        
+        gene[1] = [0b01010101, 0b10101010];
+        Assert.That(gene[1], Is.EqualTo(new byte[] { 0b01010101, 0b10101010 }));
+    }
+
+    [Test]
+    public void Indexer_GranularityNegative_ReadWriteBits()
+    {
+        var riboseSequence = new byte[] { 0b10101010, 0b11110000 };
+        var gene = new Gene(1, riboseSequence); 
+
+        byte[] expected = [0b00000001];
+        Assert.That(gene[7], Is.EqualTo(expected));
+        
+        gene[7] = [0b00000000];
+        Assert.That(gene[7], Is.EqualTo(new byte[] { 0b00000000 }));
+    }
+
+    [Test]
+    public void Indexer_GranularityExceed_ThrowsException()
+    {
+        var riboseSequence = new byte[] { 0b10101010, 0b11110000 };
+        var gene = new Gene(3, riboseSequence);
+
+        Assert.Throws<ArgumentException>(() =>
+        {
+            gene[0] = [0b10101010, 0b11110000, 0b00001111];
+        });
+    }
+}