diff --git a/Tests/NFUnitTestStringBuilder/EncodingTests.cs b/Tests/NFUnitTestStringBuilder/EncodingTests.cs index 00f49d1..9e8dfb1 100644 --- a/Tests/NFUnitTestStringBuilder/EncodingTests.cs +++ b/Tests/NFUnitTestStringBuilder/EncodingTests.cs @@ -10,58 +10,270 @@ namespace NFUnitTestStringBuilder { - [TestClass] - public class EncodingTests - { - [TestMethod] - public void Utf8EncodingTests_Test1() - { - string str = "this is a normal string that will be used to convert to bytes then back to a string"; - - byte[] data = new byte[128]; - int len = str.Length; - int idx = 0; - - Random rand = new Random(); - - int cBytes = 0; - - while (len > 0) - { - int size = (len <= 2) ? len : rand.Next(len / 2) + 1; - len -= size; - - int cnt = Encoding.UTF8.GetBytes(str, idx, size, data, cBytes); - - Assert.AreEqual(str.Substring(idx, size), new string(Encoding.UTF8.GetChars(data, cBytes, cnt))); - - cBytes += cnt; - idx += size; - } - Assert.AreEqual(cBytes, str.Length); - string strAfter = new string(Encoding.UTF8.GetChars(data, 0, cBytes)); - Assert.AreEqual(str, strAfter); - } - - [TestMethod] - public void Utf8EncodingTests_Test2() - { - string str = "this is a normal string that will be used to convert to bytes then back to a string"; - byte[] data = Encoding.UTF8.GetBytes(str); - Assert.AreEqual(data.Length, str.Length); - string strAfter = new string(Encoding.UTF8.GetChars(data)); - Assert.AreEqual(str, strAfter); - } - - [TestMethod] - public void Utf8EncodingTests_Test3() - { - // This tests involves a string with a special character - string str = "AB\u010DAB"; - byte[] data = new byte[4]; - int count = Encoding.UTF8.GetBytes(str, 1, 3, data, 0); - Assert.AreEqual(4, count); - Assert.AreEqual("B\u010DA", new string(Encoding.UTF8.GetChars(data))); - } - } + [TestClass] + public class EncodingTests + { + [TestMethod] + public void Utf8EncodingTests_Test1() + { + string str = "this is a normal string that will be used to convert to bytes then back to a string"; + + byte[] data = new byte[128]; + int len = str.Length; + int idx = 0; + + Random rand = new Random(); + + int cBytes = 0; + + while (len > 0) + { + int size = (len <= 2) ? len : rand.Next(len / 2) + 1; + len -= size; + + int cnt = Encoding.UTF8.GetBytes(str, idx, size, data, cBytes); + + Assert.AreEqual(str.Substring(idx, size), new string(Encoding.UTF8.GetChars(data, cBytes, cnt))); + + cBytes += cnt; + idx += size; + } + Assert.AreEqual(cBytes, str.Length); + string strAfter = new string(Encoding.UTF8.GetChars(data, 0, cBytes)); + Assert.AreEqual(str, strAfter); + } + + [TestMethod] + public void Utf8EncodingTests_Test2() + { + string str = "this is a normal string that will be used to convert to bytes then back to a string"; + byte[] data = Encoding.UTF8.GetBytes(str); + Assert.AreEqual(data.Length, str.Length); + string strAfter = new string(Encoding.UTF8.GetChars(data)); + Assert.AreEqual(str, strAfter); + } + + [TestMethod] + public void Utf8EncodingTests_Test3() + { + // This tests involves a string with a special character + string str = "AB\u010DAB"; + byte[] data = new byte[4]; + int count = Encoding.UTF8.GetBytes(str, 1, 3, data, 0); + Assert.AreEqual(4, count); + Assert.AreEqual("B\u010DA", new string(Encoding.UTF8.GetChars(data))); + + } + + private void RoundtripUtf8(byte[] input, byte[] expected, int expectedStringLength) + { + string decoded = Encoding.UTF8.GetString(input,0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + Assert.AreEqual(expectedStringLength, decoded.Length); + CollectionAssert.AreEqual(expected, reencoded, $"Failed on input: {BitConverter.ToString(input)}"); + } + + [TestMethod] + public void Utf8EncodingTests_TestValid2ByteSequence() + { + byte[] input = new byte[] { 0xC2, 0xA9 }; // U+00A9 © + byte[] expected = new byte[] { 0xC2, 0xA9 }; + RoundtripUtf8(input, expected, 1); + } + + [TestMethod] + public void Utf8EncodingTests_TestValid3ByteSequence() + { + byte[] input = new byte[] { 0xE2, 0x82, 0xAC }; // U+20AC € + byte[] expected = new byte[] { 0xE2, 0x82, 0xAC }; + RoundtripUtf8(input, expected, 1); + } + + [TestMethod] + public void Utf8EncodingTests_TestValid4ByteSequence() + { + byte[] input = new byte[] { 0xF0, 0x9F, 0x98, 0x80 }; // U+1F600 😀 + byte[] expected = new byte[] { 0xF0, 0x9F, 0x98, 0x80 }; + RoundtripUtf8(input, expected, 2); + } + + + [TestMethod] + public void Utf8EncodingTests_TestOverlongEncoding1() + { + // Should produce � (U+FFFD) for each bad byte pair + byte[] input = new byte[] { 0xC0, 0xAF }; // Overlong '/' + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 2); + } + + [TestMethod] + public void Utf8EncodingTests_TestOverlongEncoding2() + { + byte[] input = new byte[] { 0xE0, 0x80, 0xAF }; // Overlong '/' + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 3); + } + + [TestMethod] + public void Utf8EncodingTests_TestInvalid3ByteLastByteInvalid() + { + byte[] input = new byte[] { 0xE2, 0x82, 0xFE }; // UTF-8 3 bytes, 0xFE is the invalid character + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 2); + } + + [TestMethod] + public void Utf8EncodingTests_TestInvalid3ByteMiddleByteInvalid() + { + byte[] input = new byte[] { 0xE2, 0xFE, 0xAC }; // UTF-8 3 bytes, 0xFE is the invalid character + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 3); + } + + [TestMethod] + public void Utf8EncodingTests_TestInvalid4ByteLastByteInvalid() + { + byte[] input = new byte[] { 0xF0, 0x9F, 0x98, 0xFE }; // UTF-8 4 bytes, 0xFE is the invalid character + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 2); + } + + // 0xF0, 0x9F, 0x98, 0x80 + [TestMethod] + public void Utf8EncodingTests_TestInvalid4ByteThirdByteInvalid() + { + byte[] input = new byte[] { 0xF0, 0x9F, 0xFE, 0x80 }; // UTF-8 4 bytes, 0xFE is the invalid character + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 3); + } + + [TestMethod] + public void Utf8EncodingTests_TestInvalid4ByteSecondByteInvalid() + { + byte[] input = new byte[] { 0xF0, 0xFE, 0x98, 0x80 }; // UTF-8 4 bytes, 0xFE is the invalid character + byte[] expected = new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 4); + } + + [TestMethod] + public void Utf8EncodingTests_TestIsolatedContinuationByte() + { + byte[] input = new byte[] { 0x80 }; // Invalid lone continuation byte + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + CollectionAssert.AreEqual(new byte[] { 0xEF, 0xBF, 0xBD }, reencoded); + } + + [TestMethod] + public void Utf8EncodingTests_TestIllegalCodePositionSurrogate() + { + byte[] input = new byte[] { 0xED, 0xA0, 0x80 }; // U+D800 high surrogate + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + CollectionAssert.AreEqual(new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }, reencoded); + } + + [TestMethod] + public void Utf8EncodingTests_TestMaximumValidCodepoint() + { + byte[] input = new byte[] { 0xF4, 0x8F, 0xBF, 0xBF }; // U+10FFFF + byte[] expected = new byte[] { 0xF4, 0x8F, 0xBF, 0xBF }; + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + RoundtripUtf8(input, expected, 2); + } + + [TestMethod] + public void Utf8EncodingTests_TestCodepointBeyondUPlus10FFFF() + { + byte[] input = new byte[] { 0xF4, 0x90, 0x80, 0x80 }; // > U+10FFFF + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + // All 4 bytes become one or two � depending on how it was handled + CollectionAssert.AreEqual( + new byte[] { 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }, reencoded); + } + + [TestMethod] + public void Utf8EncodingTests_TestUnexpectedContinuationSequence() + { + byte[] input = new byte[] { 0xC2, 0x41 }; // Valid 0xC2 (start of 2-byte), but 0x41 (A) not valid continuation + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + // Expect: �A + CollectionAssert.AreEqual(new byte[] { 0xEF, 0xBF, 0xBD, 0x41 }, reencoded); + } + + [TestMethod] + public void Utf8EncodingTests_TestASCII() + { + byte[] input = new byte[] { 0x47, 0x6F, 0x6F, 0x64 }; // "Good" + byte[] expected = new byte[] { 0x47, 0x6F, 0x6F, 0x64 }; + RoundtripUtf8(input, expected, 4); + } + + [TestMethod] + public void Utf8EncodingTests_TestASCIIWithInvalidByte() + { + byte[] input = new byte[] { 0x42, 0x41, 0x44, 0xEF, 0xFF }; // BAD�� + byte[] expected = new byte[] { 0x42, 0x41, 0x44, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD }; + RoundtripUtf8(input, expected, 5); + } + + [TestMethod] + public void Utf8EncodingTests_TestASCIIWithInvalidByteInBetween() + { + byte[] input = new byte[] { 0x42, 0x41, 0x44, 0xEF, 0xFF, 0x42, 0x41, 0x44 }; // BAD��BAD + byte[] expected = new byte[] { 0x42, 0x41, 0x44, 0xEF, 0xBF, 0xBD, 0xEF, 0xBF, 0xBD, 0x42, 0x41, 0x44 }; + RoundtripUtf8(input, expected, 8); + } + + [TestMethod] + public void Utf8EncodingTests_TestASCIIWithNull() + { + // All characters will be dropped after the null character in nanoFramework + byte[] input = new byte[] { 0x54, 0x65, 0x73, 0x74, 0x20, 0x6E, 0x75, 0x6C, 0x6C, 0x00, + 0x61, 0x66, 0x74, 0x65, 0x72, 0x20, 0x6E, 0x75, 0x6C, 0x6C }; // Test null\0after null + byte[] expected = new byte[] { 0x54, 0x65, 0x73, 0x74, 0x20, 0x6E, 0x75, 0x6C, 0x6C }; + RoundtripUtf8(input, expected, 9); + } + + [TestMethod] + public void Utf8EncodingTests_TestStringWithEmoji() + { + string strInput = "nanoFramework is fantastic 🚀"; + var input = Encoding.UTF8.GetBytes(strInput); + byte[] expected = new byte[] { 0x6E, 0x61, 0x6E, 0x6F, 0x46, 0x72, 0x61, 0x6D, 0x65, 0x77, 0x6F, 0x72, 0x6B, 0x20, 0x69, + 0x73, 0x20, 0x66, 0x61, 0x6E, 0x74, 0x61, 0x73, 0x74, 0x69, 0x63, 0x20, 0xF0, 0x9F, 0x9A, 0x80 }; + RoundtripUtf8(input, expected, 29); + } + + [TestMethod] + public void Utf8EncodingTests_TestFullASCIIRange() + { + // Full ASCII Range except the null character + byte[] input = new byte[] + { + 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, + 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, + 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, + 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, + 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, + 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, + 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, + 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, + 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, + 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, + 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, + 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, + 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, + 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, + 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F + }; + string decoded = Encoding.UTF8.GetString(input, 0, input.Length); + byte[] reencoded = Encoding.UTF8.GetBytes(decoded); + RoundtripUtf8(reencoded, input, 127); + } + } }