add basic test case for multiextent files

Author: 13xforever

Tests/LibraryTests/Iso9660/Data/multiextent.iso_header.gz

@@ -1,5 +1,6 @@
 using System.IO;
 using System.Linq;
+using System.Threading.Tasks;
 using DiscUtils.Iso9660;
 using LibraryTests.Utilities;
 using Xunit;
@@ -11,17 +12,40 @@ public class SampleDataTests
     [Fact]
     public void AppleTestZip()
     {
-        using var iso = Helpers.Helpers.LoadTestDataFileFromGZipFile("Iso9660", "apple-test.iso.gz");
+        using var iso = Helpers.Helpers.LoadTestDataFileFromGZipFile(nameof(Iso9660), "apple-test.iso.gz");
         using var cr = new CDReader(iso, false);
 
         var dir = cr.GetDirectoryInfo("sub-directory");
         Assert.NotNull(dir);
         Assert.Equal("sub-directory", dir.Name);
 
-        var file = dir.GetFiles("apple-test.txt");
-        Assert.Single(file);
-        Assert.Equal(21, file.First().Length);
-        Assert.Equal("apple-test.txt", file.First().Name);
-        Assert.Equal(dir, file.First().Directory);
+        var files = dir.GetFiles("apple-test.txt").ToList();
+        Assert.Single(files);
+        Assert.Equal(21, files.First().Length);
+        Assert.Equal("apple-test.txt", files.First().Name);
+        Assert.Equal(dir, files.First().Directory);
+    }
+
+    [Fact]
+    public void MultiExtentFiles()
+    {
+        using var iso = Helpers.Helpers.LoadTestDataFileFromGZipFile(nameof(Iso9660), "multiextent.iso_header.gz");
+        using var cr = new CDReader(iso, joliet: true, true);
+
+        var pathToMultiextentFiles = @"PS3_GAME\USRDIR\Resource\Common";
+        var fsEntries = cr.GetFileSystemEntries(pathToMultiextentFiles).ToList();
+        Assert.Equal(11, fsEntries.Count);
+
+        var dir = cr.GetDirectoryInfo(pathToMultiextentFiles);
+        var files = dir.GetFiles().ToList();
+        Assert.Equal(10, files.Count);
+
+        var misc0 = files.First(f => f.Name is "Misc0.FPK");
+        var misc1 = files.First(f => f.Name is "Misc1.FPK");
+        Assert.Equal(1464404972, misc0.Length);
+        Assert.Equal(1585521232, misc1.Length);
+        
+        var meClusters = cr.PathToClusters(misc0.FullName).ToList();
+        Assert.Equal(2, meClusters.Count);
     }
 }