Semi-automated game log testing

[cxong]

Following up from #997 (comment), allow testing via a web browser automation tool (i.e. selenium), which starts the game with certain settings #1036, plays a gamelog, then checks the status of the game. For example:

1. Start normal 2v2 game
2. Play game log: spawn creatures, creature 1 attacks creature 2
3. Check conditions: creature 2 health should be x

What we get:

• Test suite to guard against regressions: run test suite, see whether abilities are broken
• TDD: write the tests first, write code second. This also helps designers/developers communicate, i.e. the developer knows exactly what the designer wants some ability to do.
• Easier reviews: no need for manual testing/verification, just run the tests; it's also easier to see if there's a test condition missing

What we need:

• Selenium
• include match settings in replayable combat log #1036 or a workaround - maybe just selenium clicking some buttons
• Some way to inspect game status, may be easy already like G.creatures.get("Gumble", "player1").stats.health === 123, I haven't checked

[DreadKnight]

Since the game has a replayable log, Selenium might not be really needed, as it's more meant for websites and apps that don't have such a feature. Instead we could add some command / hokey to the game that would start automated testing, so the whole browser thing could be avoided / optional. Results could be automatically submitted to a database. If we really want something downloadable, we could aim for #158.

[DreadKnight]

That #1036 issue was fixed a while ago, it helps out a bit :)

[DreadKnight]

Testing suite, might come in handy https://www.cypress.io