Added Experimental/MimeParser test for content with mixed line endings

UnitTests/ExperimentalMimeParserTests.cs

@@ -3411,6 +3411,44 @@ This is some raw data.
 			}
 		}
 
+		[Test]
+		public void TestMimePartContentWithMixedLineEndings ()
+		{
+			string text = "From: [email protected]\r\nTo: [email protected]\r\nSubject: content with mixed line endings\r\nDate: Sat, Dec 21 2024 09:12:42 -0500\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nThis is a normal line of text.\r\nThis line ends with a bare LF.\nAnd this line endds with CRLF.\r\n";
+
+			using (var stream = new MemoryStream (Encoding.ASCII.GetBytes (text), false)) {
+				var parser = new ExperimentalMimeParser (stream, MimeFormat.Entity);
+				var message = parser.ParseMessage ();
+
+				Assert.That (message.Body, Is.InstanceOf<TextPart> (), "Expected body of the message to be text/plain");
+				var body = (TextPart) message.Body;
+
+				Assert.That (body.Headers[HeaderId.ContentType], Is.EqualTo ("text/plain; charset=utf-8"));
+				Assert.That (body.ContentType.Charset, Is.EqualTo ("utf-8"));
+				Assert.That (body.Text, Is.EqualTo ("This is a normal line of text.\r\nThis line ends with a bare LF.\r\nAnd this line endds with CRLF.\r\n"));
+				Assert.That (body.Content.NewLineFormat, Is.EqualTo (NewLineFormat.Mixed));
+			}
+		}
+
+		[Test]
+		public async Task TestMimePartContentWithMixedLineEndingsAsync ()
+		{
+			string text = "From: [email protected]\r\nTo: [email protected]\r\nSubject: content with mixed line endings\r\nDate: Sat, Dec 21 2024 09:12:42 -0500\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nThis is a normal line of text.\r\nThis line ends with a bare LF.\nAnd this line endds with CRLF.\r\n";
+
+			using (var stream = new MemoryStream (Encoding.ASCII.GetBytes (text), false)) {
+				var parser = new ExperimentalMimeParser (stream, MimeFormat.Entity);
+				var message = await parser.ParseMessageAsync ();
+
+				Assert.That (message.Body, Is.InstanceOf<TextPart> (), "Expected body of the message to be text/plain");
+				var body = (TextPart) message.Body;
+
+				Assert.That (body.Headers[HeaderId.ContentType], Is.EqualTo ("text/plain; charset=utf-8"));
+				Assert.That (body.ContentType.Charset, Is.EqualTo ("utf-8"));
+				Assert.That (body.Text, Is.EqualTo ("This is a normal line of text.\r\nThis line ends with a bare LF.\r\nAnd this line endds with CRLF.\r\n"));
+				Assert.That (body.Content.NewLineFormat, Is.EqualTo (NewLineFormat.Mixed));
+			}
+		}
+
 		[Test]
 		public void TestGarbageBeforeMessageHeaders ()
 		{

UnitTests/MimeParserTests.cs

@@ -3481,6 +3481,44 @@ This is some raw data.
 			}
 		}
 
+		[Test]
+		public void TestMimePartContentWithMixedLineEndings ()
+		{
+			string text = "From: [email protected]\r\nTo: [email protected]\r\nSubject: content with mixed line endings\r\nDate: Sat, Dec 21 2024 09:12:42 -0500\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nThis is a normal line of text.\r\nThis line ends with a bare LF.\nAnd this line endds with CRLF.\r\n";
+
+			using (var stream = new MemoryStream (Encoding.ASCII.GetBytes (text), false)) {
+				var parser = new MimeParser (stream, MimeFormat.Entity);
+				var message = parser.ParseMessage ();
+
+				Assert.That (message.Body, Is.InstanceOf<TextPart> (), "Expected body of the message to be text/plain");
+				var body = (TextPart) message.Body;
+
+				Assert.That (body.Headers[HeaderId.ContentType], Is.EqualTo ("text/plain; charset=utf-8"));
+				Assert.That (body.ContentType.Charset, Is.EqualTo ("utf-8"));
+				Assert.That (body.Text, Is.EqualTo ("This is a normal line of text.\r\nThis line ends with a bare LF.\r\nAnd this line endds with CRLF.\r\n"));
+				Assert.That (body.Content.NewLineFormat, Is.EqualTo (NewLineFormat.Mixed));
+			}
+		}
+
+		[Test]
+		public async Task TestMimePartContentWithMixedLineEndingsAsync ()
+		{
+			string text = "From: [email protected]\r\nTo: [email protected]\r\nSubject: content with mixed line endings\r\nDate: Sat, Dec 21 2024 09:12:42 -0500\r\nMIME-Version: 1.0\r\nContent-Type: text/plain; charset=utf-8\r\n\r\nThis is a normal line of text.\r\nThis line ends with a bare LF.\nAnd this line endds with CRLF.\r\n";
+
+			using (var stream = new MemoryStream (Encoding.ASCII.GetBytes (text), false)) {
+				var parser = new MimeParser (stream, MimeFormat.Entity);
+				var message = await parser.ParseMessageAsync ();
+
+				Assert.That (message.Body, Is.InstanceOf<TextPart> (), "Expected body of the message to be text/plain");
+				var body = (TextPart) message.Body;
+
+				Assert.That (body.Headers[HeaderId.ContentType], Is.EqualTo ("text/plain; charset=utf-8"));
+				Assert.That (body.ContentType.Charset, Is.EqualTo ("utf-8"));
+				Assert.That (body.Text, Is.EqualTo ("This is a normal line of text.\r\nThis line ends with a bare LF.\r\nAnd this line endds with CRLF.\r\n"));
+				Assert.That (body.Content.NewLineFormat, Is.EqualTo (NewLineFormat.Mixed));
+			}
+		}
+
 		[Test]
 		public void TestGarbageBeforeMessageHeaders ()
 		{