MockMaker support, tests for KNNVectorValuesTests, KNNVectorValuesFactoryTests

[WojciechKrakowiak]

Description

Part one of tests implementation for #419

KNNVectorValuesTests.java – newest version was compatible

TestVectorValues.java
Compatible version doesn’t include changes from this PR: opensearch-project/k-NN#2587

KNNVectorValuesFactoryTests.java
Migrated state: opensearch-project/k-NN@a4697f4

Mocking final classes requires inline-mock-maker. In solution from KNN, mockito was self-attaching to enable the inline-mock-maker, resulting in deprecation warning. I followed the instructions how to add mockito as an agend to the build, which solves the issue and don’t require additional byte-buddy dependencies. (https://javadoc.io/doc/org.mockito/mockito-core/latest/org.mockito/org/mockito/Mockito.html#0.3)

Original KNN solution: https://github.com/opensearch-project/k-NN/pull/759/changes#diff-49a96e7eea8a94af862798a45174e6ac43eb4f8b4bd40759b5da63ba31ec3ef7
Warning from original solution:

Mockito is currently self-attaching to enable the inline-mock-maker. This will no longer work in future releases of the JDK. Please add Mockito as an agent to your build as described in Mockito's documentation: https://javadoc.io/doc/org.mockito/mockito-core/latest/org.mockito/org/mockito/Mockito.html#0.3
WARNING: A Java agent has been loaded dynamically (/Users/wojciechkrakowiak/.gradle/caches/modules-2/files-2.1/net.bytebuddy/byte-buddy-agent/1.18.8/ed5c6c9b3a146b4aa376df3b6770d6cabed20482/byte-buddy-agent-1.18.8.jar)
WARNING: If a serviceability tool is in use, please run with -XX:+EnableDynamicAgentLoading to hide this warning
WARNING: If a serviceability tool is not in use, please run with -Djdk.instrument.traceUsage for more information
WARNING: Dynamic loading of agents will be disallowed by default in a future release

Related Issues

Part of #419

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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