Fail with full description for XML diff in XmlExpectationsHelper

[Boiarshinov]

Only first difference is printed in assertion error when xml comparison is failed.
For example comparison of two xmls:

<root><a>a</a><b>b</b></root>

and

<root><b>b</b><c>c</c></root>

fails with message Body content Expected child 'a' but was 'null' - comparing <a...> at /root[1]/a[1] to <NULL>. There is nothing about child c in this message.

That is a strange behaviour of a xml-unit and it was updated with xmlunit/xmlunit#232

To fail with full diff description we should use fullDescription() method instead of toString() on Diff class.

With the full description fail message would be:

Body content Expected child 'a' but was 'null' - comparing <a...> at /root[1]/a[1] to <NULL>
Expected child 'null' but was 'c' - comparing <NULL> to <c...> at /root[1]/c[1]

Full description is better for bug fixing.

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[sbrannen]

This has been merged into 6.2.x and main, for inclusion in Spring Framework 6.2.1.

Thanks 👍