請考慮下面的類:單元測試XML編碼問題
public class SampleXmlGenerator
{
public byte[] GenerateDocumentBytes()
{
byte[] fileBytes;
using (var xmlStream = new MemoryStream())
{
using (var myWriter = new XmlTextWriter(xmlStream, Encoding.GetEncoding("UTF-8")))
{
myWriter.Formatting = Formatting.Indented;
myWriter.Indentation = 4;
myWriter.IndentChar = ' ';
myWriter.WriteStartDocument();
myWriter.WriteStartElement("foo");
myWriter.WriteString("bar");
myWriter.WriteEndElement(); // end foo
myWriter.Flush();
fileBytes = xmlStream.ToArray();
}
}
return fileBytes;
}
}
有了以下的單元測試:
[TestClass]
public class TestSampleXmlGenerator
{
[TestMethod]
public void TextEmptyDocument()
{
var actualBytes = new SampleXmlGenerator().GenerateDocumentBytes();
var actualUtf8String = Encoding.UTF8.GetString(actualBytes);
Console.Out.WriteLine("// actualUtf8String");
Console.Out.WriteLine(actualUtf8String);
var actualDefaultString = Encoding.Default.GetString(actualBytes);
Console.Out.WriteLine("// actualDefaultString");
Console.Out.WriteLine(actualDefaultString);
var expectedString = @"<?xml version=""1.0"" encoding=""utf-8""?>
<foo>bar</foo>";
var expectedBytes = Encoding.UTF8.GetBytes(expectedString);
// var expectedBytes = Encoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(@"<?xml version=""1.0"" encoding=""utf-8""?>
//<foo>bar</foo>"));
// var expectedString = Encoding.UTF8.GetString(expectedBytes);
Console.Out.WriteLine("// expectedString");
Console.Out.WriteLine(expectedString);
Assert.AreEqual(expectedBytes.Length, actualBytes.Length);
//Assert.AreEqual(expectedString, actualUtf8String);
}
}
最後輸出:
Assert.AreEqual failed. Expected:<54>. Actual:<57>.
// actualUtf8String
<?xml version="1.0" encoding="utf-8"?>
<foo>bar</foo>
// actualDefaultString
<?xml version="1.0" encoding="utf-8"?>
<foo>bar</foo>
// expectedString
<?xml version="1.0" encoding="utf-8"?>
<foo>bar</foo>
expectedString
和actualUtf8String
看起來是一樣的,但不是。
actualDefaultString
顯示開頭的3個額外字符。
那麼是什麼給?我如何去測試/比較生成的XML?我應該做什麼不同?
有一個構造函數https://msdn.microsoft.com/en-us/library/s064f8w2(v=vs.110).aspx消除字節順序標記。 –
感謝Martin,但我不想從文檔中刪除BOM,只是在測試期間忽略它。但是,您的鏈接確實指向了正確的方向,尋找什麼。 – CrnaStena
爲什麼不創建一個測試函數來檢查BOM並將其餘字符串作爲字符串返回? –