Django for unit testing

how does django import tets.py data when conducting automated testing? I export the contents of the database as api.json. Then import to the unit test database, but the unit test database does not have data, what is wrong?

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where the json file of the data under the api folder

Mar.04,2021
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-64f5-1b35511-2bf6b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35511-2bf6b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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