[jira] [Created] (AXIOM-520) Truth-XML: support XML comparison, ignoring element order

["Marco Bungart (Jira)" <ji...@apache.org>]

Marco Bungart created AXIOM-520:
-----------------------------------

             Summary: Truth-XML: support XML comparison, ignoring element order
                 Key: AXIOM-520
                 URL: https://issues.apache.org/jira/browse/AXIOM-520
             Project: Axiom
          Issue Type: New Feature
            Reporter: Marco Bungart


XMLUnit allows a similarity comparison, ignoring element order:

{code:java}
class XmlTest {
  @Test
  void test() {
    final String expected = """
        <struct>
          <int>3</int>
          <boolean>true</boolean>
        </struct>
        """;
    final String actual = """
        <struct>
          <boolean>true</boolean>
          <int>3</int>
        </struct>
        """;
    assertThat(
        actual,
        isSimilarTo(expected)
            .withNodeMatcher(new DefaultNodeMatcher(ElementSelectors.byName)));
  }
}
{code}

It would b enice to have a similar behaviour in {{truth-xml}}.

---

Story:
*As* a user of {{truth-xml}}
*When* I want to compare XML documents
*Then* I want a way to compare them ignoring the order

---

Idea for implementation:
A new method {{ignoringElementOrder()}} (and corresponding {{ignoringElementOrder(boolean)}}) could be implemented.
A corresponding acceptance test would then look like this:

{code:java}
class XmlTest {
  @Test
  void positiveTest() {
    final String expected = """
        <struct>
          <int>3</int>
          <boolean>true</boolean>
        </struct>
        """;
    final String actual = """
        <struct>
          <boolean>true</boolean>
          <int>3</int>
        </struct>
        """;
    assertAbout(xml())
        .that(actual)
        .ignoringElementOrder()
        .hasSameContentAs(expected);
  }
}
{code}



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