Java: Add integration test for failure to download a particular Maven version

[smowton]

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PR Overview

This pull request adds an integration test to simulate a failure when downloading an incorrect Maven version and verifies that the application exits with an error.

• Added a basic unit test in AppTest.java as a placeholder integration test.
• Implemented Maven version and command line validation in App.java with error messages and exit conditions.
• Included a Python helper script (test.py) to create a CodeQL database using a custom environment.

Reviewed Changes

File	Description
java/ql/integration-tests/java/maven-download-failure/src/test/java/com/example/AppTest.java	Added a simple test case.
java/ql/integration-tests/java/maven-download-failure/src/main/java/com/example/App.java	Added validation logic for Maven version and command line arguments with error messages on failure.
java/ql/integration-tests/java/maven-download-failure/test.py	Introduced a Python script to set up the test environment.

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

java/ql/integration-tests/java/maven-download-failure/src/main/java/com/example/App.java:20

• [nitpick] Consider revising the error message formatting to clearly separate the observed Maven version from the mavenHome path, for example by adding a separator or explicit label for the home directory.

System.err.println("Wrong maven version, expected '" + expectedVersion + "' but got '" + observedVersion + "'" + mavenHome);

java/ql/integration-tests/java/maven-download-failure/src/test/java/com/example/AppTest.java:16

• [nitpick] The test method name 'shouldAnswerWithTrue' is generic; consider renaming it to reflect the integration test's intent, for instance 'testMavenVersionMismatch'.

public void shouldAnswerWithTrue()

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