"vue-cli-service test:unit " runs succesfully; but npm exits err code 1 ELIFECYCLE - vue.js

Question

I'm trying to run npm run test:unit and the true error seems to be test:unit: Failed to exec test:unit script from the npm debug.log. Yet the script DOES run and execute without issue.
I'm a little new to NPM + Node so I'm struggling with this behavior. When I run npm run test:unit ( "test:unit": "vue-cli-service test:unit" in Package.json) I get this output:
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 1 file obsolete, 0 total
Time: 1.208s
Ran all test suites.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! cheatsheet#0.1.0 test:unit: `vue-cli-service test:unit`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the cheatsheet#0.1.0 test:unit script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /home/max/.npm/_logs/2020-03-26T18_16_36_155Z-debug.log
Expected Result
The tests should just pass, I shouldn't see NPM/Node crash.
Running ./node_modules/.bin/vue-cli-service test:unit I get just the test and Jest output. Everything works as expected. So what is going wrong with my setup?
Attempted Resolution
reinstalled node_modules
updated npm
updated to node:stable
reinstall nvm (node version manager) and updated
attempted to add extra debug flags to vue-cli-service
npm_debug.log
0 info it worked if it ends with ok
1 verbose cli [
1 verbose cli '/home/max/.nvm/versions/node/v13.11.0/bin/node',
1 verbose cli '/home/max/.nvm/versions/node/v13.11.0/bin/npm',
1 verbose cli 'run',
1 verbose cli 'test:unit'
1 verbose cli ]
2 info using npm#6.14.4
3 info using node#v13.11.0
4 verbose run-script [ 'pretest:unit', 'test:unit', 'posttest:unit' ]
5 info lifecycle cheatsheet#0.1.0~pretest:unit: cheatsheet#0.1.0
6 info lifecycle cheatsheet#0.1.0~test:unit: cheatsheet#0.1.0
7 verbose lifecycle cheatsheet#0.1.0~test:unit: unsafe-perm in lifecycle true
8 verbose lifecycle cheatsheet#0.1.0~test:unit: PATH: /home/max/.nvm/versions/node/v13.11.0/lib/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:/home/max/cheatsheet_project/cheatsheet/node_modules/.bin:/home/max/.pyenv/plugins/pyenv-virtualenv/shims:/home/max/.pyenv/shims:~/.pyenv/bin:/home/max/Maven/apache-maven-3.5.2/bin:/home/max/.nvm/versions/node/v13.11.0/bin:/home/max/.rbenv/shims:/home/max/.rbenv/bin:/home/max/workspace/go/bin:/home/max/.cargo/bin:/home/max/.cargo/bin:/home/max/bin:/home/max/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/lib/jvm/java-9-oracle/bin:/usr/lib/jvm/java-9-oracle/db/bin:/usr/lib/jvm/java-9-oracle/bin:/usr/lib/jvm/java-9-oracle/db/bin:/usr/local/go/bin
9 verbose lifecycle cheatsheet#0.1.0~test:unit: CWD: /home/max/cheatsheet_project/cheatsheet
10 silly lifecycle cheatsheet#0.1.0~test:unit: Args: [ '-c', 'vue-cli-service test:unit' ]
11 silly lifecycle cheatsheet#0.1.0~test:unit: Returned: code: 1 signal: null
12 info lifecycle cheatsheet#0.1.0~test:unit: Failed to exec test:unit script
13 verbose stack Error: cheatsheet#0.1.0 test:unit: `vue-cli-service test:unit`
13 verbose stack Exit status 1
13 verbose stack at EventEmitter.<anonymous> (/home/max/.nvm/versions/node/v13.11.0/lib/node_modules/npm/node_modules/npm-lifecycle/index.js:332:16)
13 verbose stack at EventEmitter.emit (events.js:315:20)
13 verbose stack at ChildProcess.<anonymous> (/home/max/.nvm/versions/node/v13.11.0/lib/node_modules/npm/node_modules/npm-lifecycle/lib/spawn.js:55:14)
13 verbose stack at ChildProcess.emit (events.js:315:20)
13 verbose stack at maybeClose (internal/child_process.js:1026:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:286:5)
14 verbose pkgid cheatsheet#0.1.0
15 verbose cwd /home/max/cheatsheet_project/cheatsheet
16 verbose Linux 4.15.0-91-generic
17 verbose argv "/home/max/.nvm/versions/node/v13.11.0/bin/node" "/home/max/.nvm/versions/node/v13.11.0/bin/npm" "run" "test:unit"
18 verbose node v13.11.0
19 verbose npm v6.14.4
20 error code ELIFECYCLE
21 error errno 1
22 error cheatsheet#0.1.0 test:unit: `vue-cli-service test:unit`
22 error Exit status 1
23 error Failed at the cheatsheet#0.1.0 test:unit script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]

Answer 1

./node_modules/.bin/vue-cli-service test:unit -u fixed this. This is the shorthand command for jest --updatesnapshot.
Since we just updated our component to point to a different address, it's reasonable to expect changes in the snapshot for this component. Our snapshot test case is failing because the snapshot for our updated component no longer matches the snapshot artifact for this test case.
To resolve this, we will need to update our snapshot artifacts. You can run Jest with a flag that will tell it to re-generate snapshots...
- From Snapshot Testing.
Observed the error about snapshots:
Snapshots: 1 file obsolete, 0 total
Unsure why this caused the NPM error but -u cleared it and I haven't seen it again.