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Testing
=======
Dotbot testing code uses [Vagrant][vagrant] to run all tests inside a virtual
machine to have tests be completely isolated from the host machine. The test
driver relies on the [Sahara][sahara] plugin to snapshot and roll back virtual
machine state. The tests are deterministic, and each test is run in a virtual
machine with fresh state, ensuring that tests that modify system state are
easily repeatable.
Installing the Test environnement
---------------------------------
### Debian-based distributions
- Install the test requirements
```bash
sudo apt install vagrant virtualbox
```
- Install the [Sahara][sahara] Vagrant plugin
```bash
vagrant plugin install sahara
```
- Install Dotbot dependencies
```bash
git submodule update --init --recursive
```
Running the Tests
-----------------
Before running the tests, the virtual machine must be running. It can be
started by running `vagrant up`.
The test suite can be run by running `./test`. Selected tests can be run by
passing paths to the tests as arguments to `./test`.
Tests can be run with a specific Python version by running `./test --version
<version>` - for example, `./test --version 3.4.3`.
When finished with testing, it is good to shut down the virtual machine by
running `vagrant halt`.
[vagrant]: https://www.vagrantup.com/
[sahara]: https://github.com/jedi4ever/sahara
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