public void TestCheckBom()
{
Assert.Throws <ArgumentNullException>(() => UnicodeCharsetDetector.CheckBom(null, 0));
Assert.Throws <ArgumentException>(() => UnicodeCharsetDetector.CheckBom(new byte[0], 1));
// UTF-7
Assert.AreEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0x38 }, 4));
Assert.AreEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0x39 }, 4));
Assert.AreEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0x2B }, 4));
Assert.AreEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0x2F }, 4));
// UTF-7 BAD
Assert.AreNotEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0x2F }, 3));
Assert.AreNotEqual(Charset.Utf7Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0x2B, 0x2F, 0x76, 0 }, 4));
// UTF-8
Assert.AreEqual(Charset.Utf8Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xEF, 0xBB, 0xBF }, 3));
Assert.AreEqual(Charset.Utf8Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xEF, 0xBB, 0xBF, 0 }, 4));
Assert.AreEqual(Charset.Utf8Bom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xEF, 0xBB, 0xBF, 1 }, 4));
// UTF-16 LE
Assert.AreEqual(Charset.Utf16LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE }, 2));
Assert.AreEqual(Charset.Utf16LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE, 0 }, 3));
Assert.AreEqual(Charset.Utf16LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE, 1 }, 3));
Assert.AreEqual(Charset.Utf16LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE, 1, 0 }, 4));
Assert.AreEqual(Charset.Utf16LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE, 0, 1 }, 4));
// UTF-16 BE
Assert.AreEqual(Charset.Utf16BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFE, 0xFF }, 2));
Assert.AreEqual(Charset.Utf16BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFE, 0xFF, 0 }, 3));
Assert.AreEqual(Charset.Utf16BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFE, 0xFF, 1 }, 3));
Assert.AreEqual(Charset.Utf16BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFE, 0xFF, 1, 0 }, 4));
Assert.AreEqual(Charset.Utf16BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFE, 0xFF, 0, 1 }, 4));
// UTF-32 LE/BE
Assert.AreEqual(Charset.Utf32LeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0xFF, 0xFE, 0, 0 }, 4));
Assert.AreEqual(Charset.Utf32BeBom, UnicodeCharsetDetector.CheckBom(new byte[] { 0, 0, 0xFE, 0xFF }, 4));
}
