Vue installation unit test unit-jest plug-in encountered a problem

uses the version of vue-cli 3.2.1
creates a new project via vue-cli
does not select jest unit tests when selecting preset plug-ins
while vue-cli3.0 can add plug-ins after the project is created
execute the following command on the command line

vue add @vue/cli-plugin-unit-jest

but misreported

this error message is very strange. On the one hand, you have successfully installed the plug-in, on the other hand, you are asked whether you have forgotten to install the plug-in
and the following command does not work

.
vue add @vue/unit-jest
vue invoke @vue/cli-plugin-unit-jest
vue invoke @vue/unit-jest

how exactly is this plug-in installed

Mar.11,2022

whether to solve this problem, encountered a problem similar to

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1eadc60-217f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1eadc60-217f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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