RFR: Initial section on testing [v2]

[Jesper Wilhelmsson]

> It's a start.

Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:

  Updates suggested by Phil and Igor

-------------

Changes:
  - all: https://git.openjdk.java.net/guide/pull/30/files
  - new: https://git.openjdk.java.net/guide/pull/30/files/591e08b6..f2bd4bc0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=30&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=30&range=00-01

  Stats: 27 lines in 2 files changed: 18 ins; 1 del; 8 mod
  Patch: https://git.openjdk.java.net/guide/pull/30.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/30/head:pull/30

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