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# Testing
The primary purpose of a backup is to have the data available for later. As such, it's critical that zbackup is able to restore data. This is a test driver aimed at running zbackup through its paces and stress testing it.
**This is not aimed at being a simple to use tool (yet)**
## Basic tests
The system includes some hardcoded tests where is creates some pseudo-ramdom files and checks that the data is deduplicated, that garbage collection reclaims the data, and that data is recovered exactly as it was stored.
## Stress Test
This is a more random test, aimed at throwing a variety of situations at zbackup to try and break it.
- The idea is that the program is given a sample data set
- The system will loop a specific number of times
- Each loop, the system will:
- Randomly pick some files and backup each file
- Check all backups restore identically to the original data
- Randomly pick a smaller number files backed up previously and delete them
- Check all backups
- Garbage collect
- Check all backups
- Compact the backups
- Check all backups
#### Example Test
```
mkdir /tmp/zbackuptest/
rm -rfv /tmp/zbackuptest/*
python3 tests/regression/regression.py \
--zbackup /my/copy/of/zbackup \
--tmp /tmp/zbackuptest
--samples /sample/data/
--seed 123
--loops 80
--add-per-loop 60
--delete-per-loop 50
--log-level 3
--key /tmp/zkey
```
#### Arguments
The arguments you supply are:
- `--zbackup`: The zbackup binary to run.
- `--tmp`: Where to create the temporary zbackup store
- `--samples`: The files to randomly select and backup
- `--seed`: Used to generate the random numbers. If you have a failure, using the same seed should reproduce it.
- `--loops`: How many times to run the loop sequence
- `--add-per-loop`: How many files to add from samples on each loop
- `--delete-per-loop`: Hoe many files to delete from the backup per loop. These could be from a previous cycle.
- `--log-level`: 0 - 3. 1 is quite useful, but 2 or 3 might be informative to see how zbackup is being called.
- `--key`: The key for zbackup encryption. Can be omitted, implying no encryption.
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