review: test: Fixed nondeterministic failures in ProcessingTest.testInitPropertiesWithWrongType()

[yonghanlin]

What does this PR do?

This PR draws inspiration from the earlier PR #6084, which has not seen recent activity. The fix has been re-implemented on the current codebase and updated accordingly. In particular, this PR fixes a nondeterministic test failure in ProcessingTest.testInitPropertiesWithWrongType() when running with NonDex.

Problem

The failures occur when the test applies multiple processor properties within a single ProcessorProperties initialization. In the test, aString, anObject, and anInt were set within the same ProcessorProperties instance. Depending on iteration order, the anInt property could be processed before the valid aString and anObject, causing initProperties() to throw before they were set.

Reproduce Test

To reproduce the failure, run NonDex on . module using the following commands:

mvn -pl . edu.illinois:nondex-maven-plugin:2.1.7:nondex -Dtest=spoon.test.processing.ProcessingTest#testInitPropertiesWithWrongType

The Fix

The test is restructured into two initialization phases:

1. Apply valid properties (aString, anObject) and verify they are correctly set.
2. Apply the invalid property (anInt="foo") separately and verify that it triggers SpoonException while leaving other properties unchanged.

[monperrus]

Thanks a lot @yonghanlin

We like short PRs to improve tests.

Tip: avoid opening many PRs at once, it's easily overwhelming for maintainers. Prefer opening them one by one, one after the other, once the previous one has been merged.