Describe the bug

The test org.apache.helix.rest.server.TestResourceAssignmentOptimizerAccessor#testComputePartitionAssignment is flaky. The JSON strings in the assertion can change and sometime not pass the assertions.
JSON may change the order of the elements in arrays as well as elements on the same level – this leads to the flaky test.

To Reproduce

mvn -pl helix-rest edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dtest=org.apache.helix.rest.server.TestResourceAssignmentOptimizerAccessor#testComputePartitionAssignment

Expected behavior

Test should not be flaky – it should pass or fail (in the current case it should pass)

Additional context

Change the assertions from JUNIT-Assertions to JSONAssertions.