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# Running Tests {#sec-running-nixos-tests}
You can run tests using `nix-build`. For example, to run the test
[`login.nix`](https://github.com/NixOS/nixpkgs/blob/master/nixos/tests/login.nix),
you do:
```ShellSession
$ cd /my/git/clone/of/nixpkgs
$ nix-build -A nixosTests.login
```
After building/downloading all required dependencies, this will perform
a build that starts a QEMU/KVM virtual machine containing a NixOS
system. The virtual machine mounts the Nix store of the host; this makes
VM creation very fast, as no disk image needs to be created. Afterwards,
you can view a log of the test:
```ShellSession
$ nix-store --read-log result
```
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