The XMLUnit library not only compares complete XML documents but also can perform a lot of useful activities related to XPath e.g. They provide a comparison engine for comparing XML.
Instead, you will use Diff and DetailedDiff the two important classes for XML comparison. The heart and soul of XMLUnit are the DifferenceEngine class but we won't use it directly. Also while comparing XML files, it's very important to know exactly which content or part is different and XMLUnit not only shows the content which is different but also the XPath of elements which is getting compared. Btw, comparing XML is completely different than comparing String in Java or comparing objects using equals(), as two XML which contains different comments and whitespace can be equals, which is not true for String or character comparison. It is a rich library and provides a detailed comparison of XML files. Similar to JUnit, XMLUnit can also be used to test XML files for comparison by extending the XMLTestcase class.
The XMLUnit library can be used to compare two XML files in Java.
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