RFR: 1627: Add tests for bot factories [v2]

[Zhao Song]

> Add some tests for BotFactories.

Zhao Song has updated the pull request incrementally with two additional commits since the last revision:

 - Use TestBotFactory
 - delete json file

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Changes:
  - all: https://git.openjdk.org/skara/pull/1393/files
  - new: https://git.openjdk.org/skara/pull/1393/files/dd99070a..5cd729bd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1393&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1393&range=00-01

  Stats: 258 lines in 3 files changed: 201 ins; 53 del; 4 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