Attempt to reproduce #40

Author: Jericho

Source/HttpMultipartParser.UnitTests/ParserScenarios/FileLineSpansAccrossTwoChunks.cs

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+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using Xunit;
+
+namespace HttpMultipartParser.UnitTests.ParserScenarios
+{
+	// This test attempts to reproduce the bug discussed here:
+	// https://github.com/Http-Multipart-Data-Parser/Http-Multipart-Data-Parser/issues/40
+	public class FileLineSpansAccrossTwoChunks
+	{
+		private static readonly string part1 = "--boundary\r\nContent-Disposition: form-data; name=\"param1\"\r\n\r\nFirst value\r\n";
+		private static readonly string part2 = "--boundary\r\nContent-Disposition: form-data; name=\"param2\"\r\n\r\nSecond value\r\n--boundary--";
+
+		// Buffer size is calculated to split the '\r' and '\n' after "First value"
+		private static readonly int _binaryBufferSize = part1.Length - 1;
+		private static readonly string _testData = TestUtil.TrimAllLines($"{part1}{part2}");
+
+		private static readonly TestData _testCase = new TestData(
+			_testData,
+			new List<ParameterPart>
+			{
+				new ParameterPart("param1", "First value"),
+				new ParameterPart("param2", "Second value"),
+			},
+			Enumerable.Empty<FilePart>().ToList()
+		);
+
+		/// <summary>
+		///     Initializes the test data before each run, this primarily
+		///     consists of resetting data stream positions.
+		/// </summary>
+		public FileLineSpansAccrossTwoChunks()
+		{
+			foreach (var filePart in _testCase.ExpectedFileData)
+			{
+				filePart.Data.Position = 0;
+			}
+		}
+
+		[Fact]
+		public void CanHandleNewLineAccrossTwoChunks()
+		{
+			var options = new ParserOptions
+			{
+				Boundary = "boundary",
+				BinaryBufferSize = _binaryBufferSize,
+				Encoding = Encoding.UTF8
+			};
+
+			using (Stream stream = TestUtil.StringToStream(_testCase.Request, options.Encoding))
+			{
+				var parser = MultipartFormDataParser.Parse(stream, options);
+				Assert.True(_testCase.Validate(parser));
+			}
+		}
+	}
+}