RFR: 1627: Add tests for bot factories [v4]

[Zhao Song]

> Add some tests for BotFactories.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  restore BotRunnerConfiguration

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Changes:
  - all: https://git.openjdk.org/skara/pull/1393/files
  - new: https://git.openjdk.org/skara/pull/1393/files/31efcd03..693df804

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1393&range=03
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1393&range=02-03

  Stats: 17 lines in 1 file changed: 0 ins; 9 del; 8 mod
  Patch: https://git.openjdk.org/skara/pull/1393.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1393/head:pull/1393

PR: https://git.openjdk.org/skara/pull/1393