mono/mcs/class/corlib/Test/System.Text/UTF8EncodingTest.cs

//
// UTF8EncodingTest.cs - NUnit Test Cases for System.Text.UTF8Encoding
//
// Authors:
//	Patrick Kalkman  [email protected]
//	Sebastien Pouliot ([email protected])
//
// (C) 2003 Patrick Kalkman
// (C) 2004 Novell (http://www.novell.com)
//

using NUnit.Framework;
using System;
using System.Text;

#if NET_2_0
using DecoderException = System.Text.DecoderFallbackException;
#else
using DecoderException = System.ArgumentException;
#endif

using AssertType = NUnit.Framework.Assert;

namespace MonoTests.System.Text {

	[TestFixture]
	public class UTF8EncodingTest : Assertion {

		private UTF8Encoding utf8;

		[SetUp]
		public void Create () 
		{
			utf8 = new UTF8Encoding (true, true);
		}

                [Test]
                public void TestEncodingGetBytes1()
                {
                        UTF8Encoding utf8Enc = new UTF8Encoding ();
                        string UniCode = "\u0041\u2262\u0391\u002E";
                        
                        // "A<NOT IDENTICAL TO><ALPHA>." may be encoded as 41 E2 89 A2 CE 91 2E 
                        // see (RFC 2044)
                        byte[] utf8Bytes = utf8Enc.GetBytes (UniCode);
                        
                        Assertion.AssertEquals ("UTF #1", 0x41, utf8Bytes [0]);
                        Assertion.AssertEquals ("UTF #2", 0xE2, utf8Bytes [1]);
                        Assertion.AssertEquals ("UTF #3", 0x89, utf8Bytes [2]);
                        Assertion.AssertEquals ("UTF #4", 0xA2, utf8Bytes [3]);
                        Assertion.AssertEquals ("UTF #5", 0xCE, utf8Bytes [4]);
                        Assertion.AssertEquals ("UTF #6", 0x91, utf8Bytes [5]);
                        Assertion.AssertEquals ("UTF #7", 0x2E, utf8Bytes [6]);
                }
        
                [Test]
                public void TestEncodingGetBytes2()
                {
                        UTF8Encoding utf8Enc = new UTF8Encoding ();
                        string UniCode = "\u0048\u0069\u0020\u004D\u006F\u006D\u0020\u263A\u0021";
                        
                        // "Hi Mom <WHITE SMILING FACE>!" may be encoded as 48 69 20 4D 6F 6D 20 E2 98 BA 21 
                        // see (RFC 2044)
                        byte[] utf8Bytes = new byte [11];
                        
                        int ByteCnt = utf8Enc.GetBytes (UniCode.ToCharArray(), 0, UniCode.Length, utf8Bytes, 0);
                        
                        Assertion.AssertEquals ("UTF #1", 11, ByteCnt);
                        Assertion.AssertEquals ("UTF #2", 0x48, utf8Bytes [0]);
                        Assertion.AssertEquals ("UTF #3", 0x69, utf8Bytes [1]);
                        Assertion.AssertEquals ("UTF #4", 0x20, utf8Bytes [2]);
                        Assertion.AssertEquals ("UTF #5", 0x4D, utf8Bytes [3]);
                        Assertion.AssertEquals ("UTF #6", 0x6F, utf8Bytes [4]);
                        Assertion.AssertEquals ("UTF #7", 0x6D, utf8Bytes [5]);
                        Assertion.AssertEquals ("UTF #8", 0x20, utf8Bytes [6]);
                        Assertion.AssertEquals ("UTF #9", 0xE2, utf8Bytes [7]);
                        Assertion.AssertEquals ("UTF #10", 0x98, utf8Bytes [8]);
                        Assertion.AssertEquals ("UTF #11", 0xBA, utf8Bytes [9]);
                        Assertion.AssertEquals ("UTF #12", 0x21, utf8Bytes [10]);
                }
        
                [Test]
                public void TestDecodingGetChars1()
                {
                        UTF8Encoding utf8Enc = new UTF8Encoding ();
                        // 41 E2 89 A2 CE 91 2E may be decoded as "A<NOT IDENTICAL TO><ALPHA>." 
                        // see (RFC 2044)
                        byte[] utf8Bytes = new byte [] {0x41, 0xE2, 0x89, 0xA2, 0xCE, 0x91, 0x2E};
                        char[] UniCodeChars = utf8Enc.GetChars(utf8Bytes);
                             
                        Assertion.AssertEquals ("UTF #1", 0x0041, UniCodeChars [0]);
                        Assertion.AssertEquals ("UTF #2", 0x2262, UniCodeChars [1]);
                        Assertion.AssertEquals ("UTF #3", 0x0391, UniCodeChars [2]);
                        Assertion.AssertEquals ("UTF #4", 0x002E, UniCodeChars [3]);
                }
                
                [Test]
#if NET_2_0
                [Category ("NotWorking")]
#endif
                public void TestMaxCharCount()
                {
                        UTF8Encoding UTF8enc = new UTF8Encoding ();
#if NET_2_0
                        // hmm, where is this extra 1 coming from?
                        Assertion.AssertEquals ("UTF #1", 51, UTF8enc.GetMaxCharCount(50));
#else
                        Assertion.AssertEquals ("UTF #1", 50, UTF8enc.GetMaxCharCount(50));
#endif
                }
        
                [Test]
#if NET_2_0
                [Category ("NotWorking")]
#endif
                public void TestMaxByteCount()
                {
                        UTF8Encoding UTF8enc = new UTF8Encoding ();
#if NET_2_0
                        // maybe under .NET 2.0 insufficient surrogate pair is just not handled, and 3 is Preamble size.
                        Assertion.AssertEquals ("UTF #1", 153, UTF8enc.GetMaxByteCount(50));
#else
                        Assertion.AssertEquals ("UTF #1", 200, UTF8enc.GetMaxByteCount(50));
#endif
                }

		// regression for bug #59648
		[Test]
		public void TestThrowOnInvalid ()
		{
			UTF8Encoding u = new UTF8Encoding (true, false);

			byte[] data = new byte [] { 0xC0, 0xAF };
			string s = u.GetString (data);
			AssertEquals (0, s.Length);

			data = new byte [] { 0x30, 0x31, 0xC0, 0xAF, 0x30, 0x32 };
			s = u.GetString (data);
			AssertEquals (4, s.Length);
			AssertEquals (0x30, (int) s [0]);
			AssertEquals (0x31, (int) s [1]);
			AssertEquals (0x30, (int) s [2]);
			AssertEquals (0x32, (int) s [3]);
		}

		// UTF8 decoding tests from http://www.cl.cam.ac.uk/~mgk25/

		[Test]
		public void T1_Correct_GreekWord_kosme () 
		{
			byte[] data = { 0xCE, 0xBA, 0xE1, 0xBD, 0xB9, 0xCF, 0x83, 0xCE, 0xBC, 0xCE, 0xB5 };
			string s = utf8.GetString (data);
			// cute but saving source code in unicode can be problematic
			// so we just ensure we can re-encode this
			AssertEquals ("Reconverted", BitConverter.ToString (data), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		public void T2_Boundary_1_FirstPossibleSequence_Pass () 
		{
			byte[] data211 = { 0x00 };
			string s = utf8.GetString (data211);
			AssertEquals ("1 byte  (U-00000000)", "\0", s);
			AssertEquals ("Reconverted-1", BitConverter.ToString (data211), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data212 = { 0xC2, 0x80 };
			s = utf8.GetString (data212);
			AssertEquals ("2 bytes (U-00000080)", 128, s [0]);
			AssertEquals ("Reconverted-2", BitConverter.ToString (data212), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data213 = { 0xE0, 0xA0, 0x80 };
			s = utf8.GetString (data213);
			AssertEquals ("3 bytes (U-00000800)", 2048, s [0]);
			AssertEquals ("Reconverted-3", BitConverter.ToString (data213), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data214 = { 0xF0, 0x90, 0x80, 0x80 };
			s = utf8.GetString (data214);
			AssertEquals ("4 bytes (U-00010000)-0", 55296, s [0]);
			AssertEquals ("4 bytes (U-00010000)-1", 56320, s [1]);
			AssertEquals ("Reconverted-4", BitConverter.ToString (data214), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_1_FirstPossibleSequence_Fail_5 () 
		{
			byte[] data215 = { 0xF8, 0x88, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data215);
			AssertNull ("5 bytes (U-00200000)", s);
			AssertEquals ("Reconverted-5", BitConverter.ToString (data215), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_1_FirstPossibleSequence_Fail_6 () 
		{
			byte[] data216 = { 0xFC, 0x84, 0x80, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data216);
			AssertNull ("6 bytes (U-04000000)", s);
			AssertEquals ("Reconverted-6", BitConverter.ToString (data216), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		public void T2_Boundary_2_LastPossibleSequence_Pass () 
		{
			byte[] data221 = { 0x7F };
			string s = utf8.GetString (data221);
			AssertEquals ("1 byte  (U-0000007F)", 127, s [0]);
			AssertEquals ("Reconverted-1", BitConverter.ToString (data221), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data222 = { 0xDF, 0xBF };
			s = utf8.GetString (data222);
			AssertEquals ("2 bytes (U-000007FF)", 2047, s [0]);
			AssertEquals ("Reconverted-2", BitConverter.ToString (data222), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data223 = { 0xEF, 0xBF, 0xBF };
			s = utf8.GetString (data223);
			AssertEquals ("3 bytes (U-0000FFFF)", 65535, s [0]);
			AssertEquals ("Reconverted-3", BitConverter.ToString (data223), BitConverter.ToString (utf8.GetBytes (s)));

		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_2_LastPossibleSequence_Fail_4 () 
		{
			byte[] data224 = { 0x7F, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data224);
			AssertNull ("4 bytes (U-001FFFFF)", s);
			AssertEquals ("Reconverted-4", BitConverter.ToString (data224), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_2_LastPossibleSequence_Fail_5 () 
		{
			byte[] data225 = { 0xFB, 0xBF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data225);
			AssertNull ("5 bytes (U-03FFFFFF)", s);
			AssertEquals ("Reconverted-5", BitConverter.ToString (data225), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_2_LastPossibleSequence_Fail_6 () 
		{
			byte[] data226 = { 0xFD, 0xBF, 0xBF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data226);
			AssertNull ("6 bytes (U-7FFFFFFF)", s);
			AssertEquals ("Reconverted-6", BitConverter.ToString (data226), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		public void T2_Boundary_3_Other_Pass () 
		{
			byte[] data231 = { 0xED, 0x9F, 0xBF };
			string s = utf8.GetString (data231);
			AssertEquals ("U-0000D7FF", 55295, s [0]);
			AssertEquals ("Reconverted-1", BitConverter.ToString (data231), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data232 = { 0xEE, 0x80, 0x80 };
			s = utf8.GetString (data232);
			AssertEquals ("U-0000E000", 57344, s [0]);
			AssertEquals ("Reconverted-2", BitConverter.ToString (data232), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data233 = { 0xEF, 0xBF, 0xBD };
			s = utf8.GetString (data233);
			AssertEquals ("U-0000FFFD", 65533, s [0]);
			AssertEquals ("Reconverted-3", BitConverter.ToString (data233), BitConverter.ToString (utf8.GetBytes (s)));

			byte[] data234 = { 0xF4, 0x8F, 0xBF, 0xBF };
			s = utf8.GetString (data234);
			AssertEquals ("U-0010FFFF-0", 56319, s [0]);
			AssertEquals ("U-0010FFFF-1", 57343, s [1]);
			AssertEquals ("Reconverted-4", BitConverter.ToString (data234), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		// Fail on MS Fx 1.1
		[ExpectedException (typeof (DecoderException))]
		public void T2_Boundary_3_Other_Fail_5 () 
		{
			byte[] data235 = { 0xF4, 0x90, 0x80, 0x80 };
			string s = utf8.GetString (data235);
			AssertNull ("U-00110000", s);
			AssertEquals ("Reconverted-5", BitConverter.ToString (data235), BitConverter.ToString (utf8.GetBytes (s)));
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_311 () 
		{
			byte[] data = { 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_312 () 
		{
			byte[] data = { 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_313 () 
		{
			byte[] data = { 0x80, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_314 () 
		{
			byte[] data = { 0x80, 0xBF, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_315 () 
		{
			byte[] data = { 0x80, 0xBF, 0x80, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_316 () 
		{
			byte[] data = { 0x80, 0xBF, 0x80, 0xBF, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_317 () 
		{
			byte[] data = { 0x80, 0xBF, 0x80, 0xBF, 0x80, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_318 () 
		{
			byte[] data = { 0x80, 0xBF, 0x80, 0xBF, 0x80, 0xBF, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_1_UnexpectedContinuation_319 () 
		{
			// 64 different continuation characters
			byte[] data = {
				0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 
				0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 
				0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 
				0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_2_LonelyStart_321 ()
		{
			byte[] data = { 
				0xC0, 0x20, 0xC1, 0x20, 0xC2, 0x20, 0xC3, 0x20, 0xC4, 0x20, 0xC5, 0x20, 0xC6, 0x20, 0xC7, 0x20, 
				0xC8, 0x20, 0xC9, 0x20, 0xCA, 0x20, 0xCB, 0x20, 0xCC, 0x20, 0xCD, 0x20, 0xCE, 0x20, 0xCF, 0x20, 
				0xD0, 0x20, 0xD1, 0x20, 0xD2, 0x20, 0xD3, 0x20, 0xD4, 0x20, 0xD5, 0x20, 0xD6, 0x20, 0xD7, 0x20, 
				0xD8, 0x20, 0xD9, 0x20, 0xDA, 0x20, 0xDB, 0x20, 0xDC, 0x20, 0xDD, 0x20, 0xDE, 0x20, 0xDF, 0x20 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_2_LonelyStart_322 () 
		{
			byte[] data = { 
				0xE0, 0x20, 0xE1, 0x20, 0xE2, 0x20, 0xE3, 0x20, 0xE4, 0x20, 0xE5, 0x20, 0xE6, 0x20, 0xE7, 0x20, 
				0xE8, 0x20, 0xE9, 0x20, 0xEA, 0x20, 0xEB, 0x20, 0xEC, 0x20, 0xED, 0x20, 0xEE, 0x20, 0xEF, 0x20 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_2_LonelyStart_323 () 
		{
			byte[] data = { 0xF0, 0x20, 0xF1, 0x20, 0xF2, 0x20, 0xF3, 0x20, 0xF4, 0x20, 0xF5, 0x20, 0xF6, 0x20, 0xF7, 0x20 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_2_LonelyStart_324 () 
		{
			byte[] data = { 0xF0, 0x20, 0xF1, 0x20, 0xF2, 0x20, 0xF3, 0x20, 0xF4, 0x20, 0xF5, 0x20, 0xF6, 0x20, 0xF7, 0x20 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_2_LonelyStart_325 () 
		{
			byte[] data = { 0xFC, 0x20, 0xFD, 0x20 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_331 () 
		{
			byte[] data = { 0xC0 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_332 () 
		{
			byte[] data = { 0xE0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_333 () 
		{
			byte[] data = { 0xF0, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_334 () 
		{
			byte[] data = { 0xF8, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_335 () 
		{
			byte[] data = { 0xFC, 0x80, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
// MS Fx 1.1 accept this
//		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_336 () 
		{
			byte[] data = { 0xDF };
			try {
				string s = utf8.GetString (data);
				// exception is "really" expected here
				AssertEquals ("MS FX 1.1 behaviour", String.Empty, s);
			}
			catch (DecoderException) {
				// but Mono doesn't - better stick to the standard
			}
		}

		[Test]
// MS Fx 1.1 accept this
//		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_337 () 
		{
			byte[] data = { 0xEF, 0xBF };
			try {
				string s = utf8.GetString (data);
				// exception is "really" expected here
				AssertEquals ("MS FX 1.1 behaviour", String.Empty, s);
			}
			catch (DecoderException) {
				// but Mono doesn't - better stick to the standard
			}
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_338 () 
		{
			byte[] data = { 0xF7, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_339 () 
		{
			byte[] data = { 0xF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_3_LastContinuationMissing_3310 () 
		{
			byte[] data = { 0xFD, 0xBF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_4_ConcatenationImcomplete () 
		{
			byte[] data = {
				0xC0, 0xE0, 0x80, 0xF0, 0x80, 0x80, 0xF8, 0x80, 0x80, 0x80, 0xFC, 0x80, 0x80, 0x80, 0x80, 0xDF, 
				0xEF, 0xBF, 0xF7, 0xBF, 0xBF, 0xFB, 0xBF, 0xBF, 0xBF, 0xFD, 0xBF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_5_ImpossibleBytes_351 () 
		{
			byte[] data = { 0xFE };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_5_ImpossibleBytes_352 () 
		{
			byte[] data = { 0xFF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T3_Malformed_5_ImpossibleBytes_353 () 
		{
			byte[] data = { 0xFE, 0xFE, 0xFF, 0xFF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		// Overlong == dangereous -> "safe" decoder should reject them

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_1_ASCII_Slash_411 () 
		{
			byte[] data = { 0xC0, 0xAF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_1_ASCII_Slash_412 () 
		{
			byte[] data = { 0xE0, 0x80, 0xAF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_1_ASCII_Slash_413 () 
		{
			byte[] data = { 0xF0, 0x80, 0x80, 0xAF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_1_ASCII_Slash_414 () 
		{
			byte[] data = { 0xF8, 0x80, 0x80, 0x80, 0xAF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_1_ASCII_Slash_415 () 
		{
			byte[] data = { 0xFC, 0x80, 0x80, 0x80, 0x80, 0xAF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_2_MaximumBoundary_421 () 
		{
			byte[] data = { 0xC1, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_2_MaximumBoundary_422 () 
		{
			byte[] data = { 0xE0, 0x9F, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_2_MaximumBoundary_423 () 
		{
			byte[] data = { 0xF0, 0x8F, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_2_MaximumBoundary_424 () 
		{
			byte[] data = { 0xF8, 0x87, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_2_MaximumBoundary_425 () 
		{
			byte[] data = { 0xFC, 0x83, 0xBF, 0xBF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_3_NUL_431 () 
		{
			byte[] data = { 0xC0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_3_NUL_432 () 
		{
			byte[] data = { 0xE0, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_3_NUL_433 () 
		{
			byte[] data = { 0xF0, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_3_NUL_434 () 
		{
			byte[] data = { 0xF8, 0x80, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
		[ExpectedException (typeof (DecoderException))]
		public void T4_Overlong_3_NUL_435 () 
		{
			byte[] data = { 0xFC, 0x80, 0x80, 0x80, 0x80, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
			public void T5_IllegalCodePosition_1_UTF16Surrogates_511 () 
		{
			byte[] data = { 0xED, 0xA0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 55296, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_512 () 
		{
			byte[] data = { 0xED, 0xAD, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56191, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_513 ()
		{
			byte[] data = { 0xED, 0xAE, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56192, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_514 () 
		{
			byte[] data = { 0xED, 0xAF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56319, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_515 ()
		{
			byte[] data = { 0xED, 0xB0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56320, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_516 () 
		{
			byte[] data = { 0xED, 0xBE, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 57216, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_1_UTF16Surrogates_517 () 
		{
			byte[] data = { 0xED, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 57343, s [0]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_521 () 
		{
			byte[] data = { 0xED, 0xA0, 0x80, 0xED, 0xB0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 55296, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 56320, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_522 () 
		{
			byte[] data = { 0xED, 0xA0, 0x80, 0xED, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 55296, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 57343, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_523 () 
		{
			byte[] data = { 0xED, 0xAD, 0xBF, 0xED, 0xB0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56191, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 56320, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_524 () 
		{
			byte[] data = { 0xED, 0xAD, 0xBF, 0xED, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56191, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 57343, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_525 () 
		{
			byte[] data = { 0xED, 0xAE, 0x80, 0xED, 0xB0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56192, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 56320, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_526 () 
		{
			byte[] data = { 0xED, 0xAE, 0x80, 0xED, 0xBF, 0x8F };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56192, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 57295, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_527 () 
		{
			byte[] data = { 0xED, 0xAF, 0xBF, 0xED, 0xB0, 0x80 };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56319, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 56320, s [1]);
		}

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
// MS Fx 1.1 accept this
		[Category ("NotDotNet")]
		[ExpectedException (typeof (DecoderException))]
#endif
		public void T5_IllegalCodePosition_2_PairedUTF16Surrogates_528 () 
		{
			byte[] data = { 0xED, 0xAF, 0xBF, 0xED, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 56319, s [0]);
			AssertEquals ("MS FX 1.1 behaviour", 57343, s [1]);
		}

		[Test]
// MS Fx 1.1 accept this
//		[ExpectedException (typeof (DecoderException))]
		public void T5_IllegalCodePosition_3_Other_531 () 
		{
			byte[] data = { 0xEF, 0xBF, 0xBE };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 65534, s [0]);
		}

		[Test]
// MS Fx 1.1 accept this
//		[ExpectedException (typeof (DecoderException))]
		public void T5_IllegalCodePosition_3_Other_532 () 
		{
			byte[] data = { 0xEF, 0xBF, 0xBF };
			string s = utf8.GetString (data);
			// exception is "really" expected here
			AssertEquals ("MS FX 1.1 behaviour", 65535, s [0]);
		}

		[Test]
		// bug #75065 and #73086.
		public void GetCharsFEFF ()
		{
			byte [] data = new byte [] {0xEF, 0xBB, 0xBF};
			Encoding enc = new UTF8Encoding (false, true);
			string s = enc.GetString (data);
			AssertEquals ("\uFEFF", s);

			Encoding utf = Encoding.UTF8;
			char[] testChars = {'\uFEFF','A'};

			byte[] bytes = utf.GetBytes(testChars);
			char[] chars = utf.GetChars(bytes);
			AssertEquals ("#1", '\uFEFF', chars [0]);
			AssertEquals ("#2", 'A', chars [1]);
		}

#if NET_2_0
		[Test]
		public void CloneNotReadOnly ()
		{
			Encoding e = Encoding.GetEncoding (65001).Clone ()
				as Encoding;
			AssertEquals (false, e.IsReadOnly);
			e.EncoderFallback = new EncoderExceptionFallback ();
		}
#endif

		[Test]
#if NET_2_0
		[ExpectedException (typeof (DecoderFallbackException))]
#else
		[ExpectedException (typeof (ArgumentException))]
		[Category ("NotDotNet")] // MS Bug
#endif
		public void Bug77315 ()
		{
			new UTF8Encoding (false, true).GetString (
				new byte [] {0xED, 0xA2, 0x8C});
		}

		[Test]
		public void SufficientByteArray ()
		{
			Encoder e = Encoding.UTF8.GetEncoder ();
			byte [] bytes = new byte [0];

			char [] chars = new char [] {'\uD800'};
			e.GetBytes (chars, 0, 1, bytes, 0, false);
			try {
				int ret = e.GetBytes (chars, 1, 0, bytes, 0, true);
#if NET_2_0
				AssertEquals ("drop insufficient char in 2.0: char[]", 0, ret);
#else
				Fail ("ArgumentException is expected: char[]");
#endif
			} catch (ArgumentException) {
			}

			string s = "\uD800";
			try {
				int ret = Encoding.UTF8.GetBytes (s, 0, 1, bytes, 0);
#if NET_2_0
				AssertEquals ("drop insufficient char in 2.0: string", 0, ret);
#else
				Fail ("ArgumentException is expected: string");
#endif
			} catch (ArgumentException) {
			}
		}

#if NET_2_0
		[Test] // bug #77550
		public void DecoderFallbackSimple ()
		{
			UTF8Encoding e = new UTF8Encoding (false, false);
			AssertType.AreEqual (0, e.GetDecoder ().GetCharCount (
					new byte [] {(byte) 183}, 0, 1),
					"#1");
			AssertType.AreEqual (0, e.GetDecoder().GetChars (
					new byte [] {(byte) 183}, 0, 1,
					new char [100], 0),
					"#2");
			AssertType.AreEqual (0, e.GetString (new byte [] {(byte) 183}).Length,
					"#3");
		}
#endif
	}
}