NativeScript cli does not stop with Karma with singleRun: true

[edusperoni]

Issue Description

When run with singleRun: true the nativescript cli will no longer exit at the end of the process, which makes us unable to detect the exit code (success/fail on unit test run) and hangs CI

Reproduction

1. create new project
2. ns test init
3. change to singleRun: true
4. ns test android/ios
5. karma will die but the cli won't report the exit code and will hang

Relevant log output (if applicable)

14 01 2022 02:23:47.950:DEBUG [NativeScript / 28 (9; AOSP on IA Emulator)]: EXECUTING -> CONNECTED

Finished in 8.803 secs / 7.01 secs @ 02:23:47 GMT-0300 (Brasilia Standard Time)

SUMMARY:
✔ 11 tests completed
14 01 2022 02:23:47.953:DEBUG [karma-server]: Run complete, exiting.
14 01 2022 02:23:47.954:DEBUG [launcher]: Disconnecting all browsers
14 01 2022 02:23:47.954:DEBUG [launcher]: null -> BEING_KILLED
14 01 2022 02:23:47.954:DEBUG [launcher]: BEING_KILLED -> BEING_FORCE_KILLED
14 01 2022 02:23:47.955:DEBUG [proxy]: Destroying proxy agents
14 01 2022 02:23:47.955:DEBUG [launcher]: BEING_FORCE_KILLED -> FINISHED
14 01 2022 02:23:47.956:WARN [NativeScript / 28 (9; AOSP on IA Emulator)]: Disconnected (0 times) Client disconnected from CONNECTED state (server shutting down)
NativeScript / 28 (9; AOSP on IA Emulator) ERROR
  Disconnected Client disconnected from CONNECTED state (server shutting down)
14 01 2022 02:23:47.957:DEBUG [NativeScript / 28 (9; AOSP on IA Emulator)]: CONNECTED -> DISCONNECTED
JS: NSUTR-socket.io: transport error
JS: NSUTR: completeAck

Environment

No response

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• I have searched the existing issues as well as StackOverflow and this has not been posted before
• This is a bug report
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[edusperoni]

this is probably the best starting point to debug this:

https://github.com/NativeScript/nativescript-cli/blob/master/lib/services/karma-execution.ts#L13

it does call that function with the exit code, but the cli process doesn't exit

Edit:

The issue only happens on successful runs. It seems it just never completes from:

nativescript-cli/lib/commands/test.ts

Lines 87 to 91 in 3150049

	await this.$testExecutionService.startKarmaServer(
	this.platform,
	liveSyncInfo,
	deviceDescriptors
	);

That promise either resolves (cli hangs) or rejects (cli exits with error code 1)