Replace Deprecated MockitoAnnotations.initMocks

[zjdaniels1985]

Replace the deprecated MockitoAnnotations.initMocks() method with the recommended Mockito.Annotations.openMocks() method

Motivation

• initMocks was used to initialize mocks annotated with @mock, @SPY, etc., in your test class
• openMocks is the recommended replacement since Mockito 3. It provides the same functionality but with better resource management
• openMocks returns an AutoCloseable object, which ensures that resources are properly closed after the test execution

Changes

Old:

import org.mockito.MockitoAnnotations;

@Before
public void setUp() {
    MockitoAnnotations.initMocks(this);
}

New:

import org.mockito.MockitoAnnotations;

public class <TEST-CLASS-NAME> {

private AutoCloseable closeable;

@Before
public void setUp() {
    closeable = MockitoAnnotations.openMocks(this)) {
        ...
    }
}

@After
public void releaseMocks() throws Exception {
        closeable. close();
    }
...

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[cla-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @zjdaniels1985 on file. In order for us to review and merge your code, please sign our Contributor License Agreement to get yourself added. You'll find the CLA and more information here: https://github.com/hivemq/hivemq-community/blob/master/CONTRIBUTING.adoc#contributor-license-agreement