add regression test for nix edit

tests/functional/flakes/edit.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+source ./common.sh
+
+requireGit
+
+flake1Dir=$TEST_ROOT/flake1
+
+createGitRepo "$flake1Dir"
+createSimpleGitFlake "$flake1Dir"
+
+export EDITOR=cat
+nix edit "$flake1Dir#" | grepQuiet simple.builder.sh

tests/functional/local.mk

@@ -2,6 +2,7 @@ nix_tests = \
   test-infra.sh \
   flakes/flakes.sh \
   flakes/develop.sh \
+  flakes/edit.sh \
   flakes/run.sh \
   flakes/mercurial.sh \
   flakes/circular.sh \

tests/functional/simple.nix

@@ -5,4 +5,5 @@ mkDerivation {
   builder = ./simple.builder.sh;
   PATH = "";
   goodPath = path;
+  meta.position = "${__curPos.file}:${toString __curPos.line}";
 }