Refactor tests to TS.

[Nerivec]

Targeting current 2.0.0 since it builds onto the already cleaned up tests (otherwise would have to refactor again 😛)

[djurny]

Hi @Nerivec @Koenkk,
Someone had an issue with z2m not starting up, which was apparently caused by an empty groups.yaml file being used in configuration.yaml:

#...
groups: groups.yaml # <-- this file does not contain anything
#...

Output:

[21:05:01] INFO: �[32mPreparing to start...�[0m
[21:05:01] INFO: �[32mSocat not enabled�[0m
[21:05:01] INFO: �[32mStarting Zigbee2MQTT...�[0m
Starting Zigbee2MQTT without watchdog.
AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:

  (0, node_assert_1.default)(result instanceof Object)

    at read (/app/lib/util/yaml.ts:24:15)
    at Object.readIfExists (/app/lib/util/yaml.ts:36:34)
    at readDevicesOrGroups (/app/lib/util/settings.ts:317:38)
    at read (/app/lib/util/settings.ts:325:5)
    at getPersistedSettings (/app/lib/util/settings.ts:393:21)
    at Object.reRead (/app/lib/util/settings.ts:640:5)
    at start (/app/index.js:130:14)

Is using empty files not supported? Or can the assert(result instanceof Object); in yaml.ts be rewritten to allow empty input?

Groetjes,

[Nerivec]

Not sure why this is reported here, but I'd say better to leave the assert, since it would otherwise allow empty configuration.yaml, which would cause other (more common) troubles. Probably need to revisit the splitting logic instead (at least a better error message).