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diff --git a/A nice way to test flake output.md b/A nice way to test flake output.md
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+---
+tags:
+  - nix
+---
+Flakes are described in [[Basic building blocks of Nix]].
+
+A way to test flake outputs is by loading the flake in nix-repl and then using `:b` which builds a derivation. I learnt about `:b` from [this Nix Pill](https://nixos.org/guides/nix-pills/06-our-first-derivation.html).
+
+```
+box main 7s
+❯ nix repl
+Nix 2.24.14
+Type :? for help.
+nix-repl> :lf .
+Added 13 variables.
+
+nix-repl> outputs.packages.x86_64-linux.default
+«derivation /nix/store/g8y3gdd2rr2j5awx8p75ih0k072571yr-box.drv»
+
+nix-repl> :b outputs.packages.x86_64-linux.default
+error: builder for '/nix/store/g8y3gdd2rr2j5awx8p75ih0k072571yr-box.drv' failed with exit code 1;
+       last 9 log lines:
+       > Running phase: unpackPhase
+       > unpacking source archive /nix/store/gli7ljgsva1wchy3h4n2lmvs1rfssl40-source
+       > source root is source
+       > Running phase: patchPhase
+       > Running phase: updateAutotoolsGnuConfigScriptsPhase
+       > Running phase: configurePhase
+       > no configure script, doing nothing
+       > Running phase: buildPhase
+       > failed to initialize build cache at /homeless-shelter/.cache/go-build: mkdir /homeless-shelter: permission denied
+       For full logs, run 'nix log /nix/store/g8y3gdd2rr2j5awx8p75ih0k072571yr-box.drv'.
+[0 built (1 failed)]
+nix-repl>
+
+```
+