More buffer boundary tests

tests/SharpCompress.Test/Arc/ArcReaderTests.cs

@@ -27,5 +27,12 @@ namespace SharpCompress.Test.Arc
 
         [Fact]
         public void Arc_Crunched_Read() => Read("Arc.crunched.arc");
+
+        [Theory]
+        [InlineData("Arc.uncompressed.largefile.arc", CompressionType.None)]
+        public void Arc_LargeFileTest_Read(string fileName, CompressionType compressionType)
+        {
+            ReadForBufferBoundaryCheck(fileName, compressionType);
+        }
     }
 }

tests/SharpCompress.Test/Arj/ArjReaderTests.cs

@@ -65,7 +65,7 @@ namespace SharpCompress.Test.Arj
         public void Arj_LargeFile_ShouldThrow(string fileName, CompressionType compressionType)
         {
             var exception = Assert.Throws<NotSupportedException>(() =>
-                Arj_LargeFileTest_Read(fileName, compressionType)
+                ReadForBufferBoundaryCheck(fileName, compressionType)
             );
         }
 
@@ -74,24 +74,7 @@ namespace SharpCompress.Test.Arj
         [InlineData("Arj.method4.largefile.arj", CompressionType.ArjLZ77)]
         public void Arj_LargeFileTest_Read(string fileName, CompressionType compressionType)
         {
-            using (var stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, fileName)))
-            using (
-                var reader = ReaderFactory.Open(stream, new ReaderOptions { LookForHeader = true })
-            )
-            {
-                while (reader.MoveToNextEntry())
-                {
-                    Assert.Equal(compressionType, reader.Entry.CompressionType);
-                    reader.WriteEntryToDirectory(
-                        SCRATCH_FILES_PATH,
-                        new ExtractionOptions { ExtractFullPath = true, Overwrite = true }
-                    );
-                }
-            }
-            CompareFilesByPath(
-                Path.Combine(SCRATCH_FILES_PATH, "news.txt"),
-                Path.Combine(MISC_TEST_FILES_PATH, "news.txt")
-            );
+            ReadForBufferBoundaryCheck(fileName, compressionType);
         }
 
         private void DoArj_Multi_Reader(string[] archives)

tests/SharpCompress.Test/ReaderTests.cs

@@ -176,6 +176,27 @@ public abstract class ReaderTests : TestBase
         }
     }
 
+    protected void ReadForBufferBoundaryCheck(string fileName, CompressionType compressionType)
+    {
+        using var stream = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, fileName));
+        using var reader = ReaderFactory.Open(stream, new ReaderOptions { LookForHeader = true });
+
+        while (reader.MoveToNextEntry())
+        {
+            Assert.Equal(compressionType, reader.Entry.CompressionType);
+
+            reader.WriteEntryToDirectory(
+                SCRATCH_FILES_PATH,
+                new ExtractionOptions { ExtractFullPath = true, Overwrite = true }
+            );
+        }
+
+        CompareFilesByPath(
+            Path.Combine(SCRATCH_FILES_PATH, "news.txt"),
+            Path.Combine(MISC_TEST_FILES_PATH, "news.txt")
+        );
+    }
+
     protected void Iterate(
         string testArchive,
         string fileOrder,