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