Integrated: Initial section on testing

[Jesper Wilhelmsson]

On Fri, 16 Oct 2020 15:58:52 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> It's a start.

This pull request has now been integrated.

Changeset: 70306058
Author:    Jesper Wilhelmsson <jwilhelm at openjdk.org>
URL:       https://git.openjdk.java.net/guide/commit/70306058
Stats:     155 lines in 3 files changed: 137 ins; 16 del; 2 mod

Initial section on testing

Reviewed-by: iignatyev, darcy, lancea, iris

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PR: https://git.openjdk.java.net/guide/pull/30