lua.tests.checkSetupHook: test lua setup hook for http package

the 'http' package is an interesting one to test because all its lua
files are in a 'http' subfolder, ie., there is no share/lua/5.1/*.lua,
only share/lua/5.1/http/*.lua files unlike most packages. This tests we
can match those subfolders.

pkgs/development/interpreters/lua-5/hooks/setup-hook.sh

@@ -25,6 +25,7 @@ addToLuaSearchPathWithCustomDelimiter() {
   # export only if the folder contains lua files
   shopt -s globstar
 
+
   for _file in ${absPattern/\?/\*\*}; do
     export "${varName}=${!varName:+${!varName};}${absPattern}"
     shopt -u globstar

pkgs/development/interpreters/lua-5/tests/default.nix

@@ -66,6 +66,21 @@ in
       touch $out
     '');
 
+  # checks that lua's setup-hook adds dependencies to LUA_PATH
+  # Prevents the following regressions
+  # $ env NIX_PATH=nixpkgs=. nix-shell --pure -Q -p luajitPackages.lua luajitPackages.http
+  # nix-shell$ luajit
+  # > require('http.request')
+  # stdin:1: module 'http.request' not found:
+  checkSetupHook = pkgs.runCommandLocal "test-${lua.name}-setup-hook" ({
+      nativeBuildInputs = [lua];
+      buildInputs = [ lua.pkgs.http ];
+      meta.platforms = lua.meta.platforms;
+    }) (''
+      ${lua}/bin/lua -e "require'http.request'"
+      touch $out
+    '');
+
   checkRelativeImports = pkgs.runCommandLocal "test-${lua.name}-relative-imports" ({
     }) (''
       source ${./assert.sh}