RFR: 8313612: Use JUnit in lib-test/jdk tests

[John Jiang]

On Wed, 2 Aug 2023 23:25:13 GMT, Qing Xiao <duke at openjdk.org> wrote:

> Modified all tests under lib-test/jdk to use JUnit

test/lib-test/jdk/test/lib/format/ArrayDiffTest.java line 2:

> 1: /*
> 2:  * Copyright (c) 2020, 2021, 2023, Oracle and/or its affiliates. All rights reserved.

Should it just modify the second year, here is `2021`, to `2023`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/15131#discussion_r1294304121