Create tests for sample JUnit files

[jozefizso]

Two unit tests for parsing sample junit-basic.xml and junit-complete.xml samples from https://github.com/testmoapp/junitxml/

This PR exercise existing implementation which does not support nested <testsuite> reports.

Nested testsuite tests are not reported

In junit-basic.xml, there's a nested testsuite:

<testsuite name="Tests.Authentication" time="9.076816">
    <testsuite name="Tests.Authentication.Login" time="4.356">
        <testcase name="testCase4" .../>
        <testcase name="testCase5" .../>
        <testcase name="testCase6" .../>
    </testsuite>
    ...
</testsuite>

The parser at src/parsers/java-junit/java-junit-parser.ts:79-82 only processes direct <testcase> children of a <testsuite>, not nested <testsuite> elements. As a result:

• 3 test cases (testCase4, testCase5, testCase6) are silently dropped
• The expected output shows "5 passed, 1 failed" (6 total), but the XML has 9 test cases

[jozefizso]

JUnit 4 itself doesn’t emit XML, and the standard JUnit XML reporters used with it (Ant’s XMLJUnitResultFormatter, Maven Surefire) produce a flat list of <testsuite> elements under <testsuites>.
They don't produce nested <testsuite> elements.

[jozefizso]

The PHPUnit has a JunitXmlLogger logger which builds a <testsuite> tree based on the suite hierarchy, so nested suites are emitted when you have nested suites in the run (for example, suites that include other suites from phpunit.xml).
You can see it in src/Logging/JUnit/JunitXmlLogger.php, where a suite started inside another suite is appended as a child instead of to the root.