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using System.Xml;
using System.Xml.Linq;
using VersOne.Epub.Internal;
using VersOne.Epub.Options;
using VersOne.Epub.Test.Unit.TestUtils;
namespace VersOne.Epub.Test.Unit.Utils
{
public class XmlUtilsTests
{
private const string XML_1_0_HEADER = "<?xml version='1.0' encoding='utf-8'?>";
private const string XML_1_1_HEADER = "<?xml version='1.1' encoding='utf-8'?>";
private const string XML_1_0_FILE = XML_1_0_HEADER + "\r\n" + XML_BODY;
private const string XML_1_1_FILE = XML_1_1_HEADER + "\r\n" + XML_BODY;
private const string XML_BODY = $"""
<parent>
<child />
</parent>
""";
private static XDocument ExpectedXDocument =>
new(
new XElement("parent",
new XElement("child")
)
);
[Fact(DisplayName = "Loading a regular XML 1.0 file should succeed")]
public async Task TestXml10File()
{
XDocument actualXDocument = await XmlUtils.LoadDocumentAsync(StreamUtils.CreateMemoryStreamForString(XML_1_0_FILE), new XmlReaderOptions());
CompareXDocuments(ExpectedXDocument, actualXDocument);
}
[Fact(DisplayName = "Loading an XML 1.1 file with XmlReaderOptions.SkipXmlHeaders = false should throw XmlException")]
public async Task TestXml11FileThrowsException()
{
await Assert.ThrowsAsync<XmlException>(() => XmlUtils.LoadDocumentAsync(StreamUtils.CreateMemoryStreamForString(XML_1_1_FILE), new XmlReaderOptions()));
}
[Fact(DisplayName = "Loading an XML 1.1 file with null XmlReaderOptions should throw XmlException")]
public async Task TestXml11FileWithNullXmlReaderOptionsThrowsException()
{
await Assert.ThrowsAsync<XmlException>(() => XmlUtils.LoadDocumentAsync(StreamUtils.CreateMemoryStreamForString(XML_1_1_FILE), null));
}
[Theory(DisplayName = "Loading either an XML 1.1 file or an XML file without a header with XmlReaderOptions.SkipXmlHeaders = true should succeed")]
[InlineData(XML_1_1_FILE)]
[InlineData(XML_BODY)]
public async Task TestXml11FileWorkaround(string xmlFileContent)
{
XmlReaderOptions xmlReaderOptions = new()
{
SkipXmlHeaders = true
};
XDocument actualXDocument = await XmlUtils.LoadDocumentAsync(StreamUtils.CreateMemoryStreamForString(xmlFileContent), xmlReaderOptions);
CompareXDocuments(ExpectedXDocument, actualXDocument);
}
[Fact(DisplayName = "Loading a file with just XML 1.1 header and no other content with XmlReaderOptions.SkipXmlHeaders = true should throw XmlException")]
public async Task TestXml11EmptyFileThrowsException()
{
XmlReaderOptions xmlReaderOptions = new()
{
SkipXmlHeaders = true
};
await Assert.ThrowsAsync<XmlException>(() => XmlUtils.LoadDocumentAsync(StreamUtils.CreateMemoryStreamForString(XML_1_1_HEADER), xmlReaderOptions));
}
private static void CompareXDocuments(XDocument expected, XDocument actual)
{
Assert.NotNull(actual);
CompareXElements(expected.Root, actual.Root);
}
private static void CompareXElements(XElement? expected, XElement? actual)
{
if (expected == null)
{
Assert.Null(actual);
}
else
{
Assert.NotNull(actual);
Assert.Equal(expected.Name, actual.Name);
foreach (XElement expectedDescendant in expected.Descendants())
{
XElement? actualDescendant = actual.Element(expectedDescendant.Name);
Assert.NotNull(actualDescendant);
CompareXElements(expectedDescendant, actualDescendant);
}
}
}
}
}
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