feat: solved day 9 part 2

09/DiskFragmenter.Tests/DiskMapTests.cs

@@ -4,6 +4,11 @@ public class DiskMapTests
 {
   private const string TestInput = "12345";
   private const string ExampleInput = "2333133121414131402";
+
+  private async Task<string> GetPuzzleInput()
+  {
+    return await File.ReadAllTextAsync(Path.Combine(AppContext.BaseDirectory, "INPUT.txt"));
+  }
   
   [Test]
   public async Task FromDenseFormat_WhenCalled_ItShouldReturnDiskMap()
@@ -59,4 +64,48 @@ public class DiskMapTests
 
     await Assert.That(result).IsEqualTo(1928);
   }
+  
+  [Test]
+  public async Task CalculateCheckSum_WhenCalledWithPuzzleInput_ItShouldReturnExpectedValue()
+  {
+    var input = await GetPuzzleInput();
+    
+    var result = DiskMap.FromDenseFormat(input)
+      .CompactDisk()
+      .CalculateCheckSum();
+
+    await Assert.That(result).IsEqualTo(6200294120911);
+  }
+  
+  [Test]
+  public async Task CalculateCheckSum_WhenCalledWhenCalledWithTestInputAndNoFragmentation_ItShouldReturnExpectedValue()
+  {
+    var result = DiskMap.FromDenseFormat(TestInput)
+      .CompactDiskWithoutFragmentation()
+      .CalculateCheckSum();
+
+    await Assert.That(result).IsEqualTo(132);
+  }
+
+  [Test]
+  public async Task CalculateCheckSum_WhenCalledWithExampleInputAndNoFragmentation_ItShouldReturnExpectedValue()
+  {
+    var result = DiskMap.FromDenseFormat(ExampleInput)
+      .CompactDiskWithoutFragmentation()
+      .CalculateCheckSum();
+
+    await Assert.That(result).IsEqualTo(2858);
+  }
+  
+  [Test]
+  public async Task CalculateCheckSum_WhenCalledWithPuzzleInputAndNoFragmentation_ItShouldReturnExpectedValue()
+  {
+    var input = await GetPuzzleInput();
+    
+    var result = DiskMap.FromDenseFormat(input)
+      .CompactDiskWithoutFragmentation()
+      .CalculateCheckSum();
+
+    await Assert.That(result).IsEqualTo(6227018762750);
+  }
 }