tests/nnn: fix tests (#2746)

There seems to be some changes on how wrapped binaries are implemented
on nixpkgs. This broke the nnn tests since the tests were coupled with
the old implementation.

This commit fix the tests, and also make it less coupled by just testing
if the bookmarks/plugins/environment variables are available.

tests/modules/programs/nnn/nnn.nix

@@ -24,6 +24,8 @@
 
     test.stubs = {
       nnnDummy.buildScript = ''
+        runHook preInstall
+
         mkdir -p "$out/bin"
         touch "$out/bin/nnn"
         chmod +x "$out/bin/nnn"
@@ -40,17 +42,13 @@
       script = ''
         assertDirectoryExists home-files/.config/nnn/plugins
 
-        assertFileRegex \
-          home-path/bin/nnn \
-          "^export NNN_BMS='D:~/Downloads;d:~/Documents;p:~/Pictures;v:~/Videos'\''${NNN_BMS:+':'}\$NNN_BMS$"
-
-        assertFileRegex \
-          home-path/bin/nnn \
-          "^export NNN_PLUG='c:fzcd;f:finder;v:imgview'\''${NNN_PLUG:+':'}\$NNN_PLUG$"
+        for bookmark in 'export NNN_BMS' '~/Downloads' '~/Documents' '~/Pictures' '~/Videos'; do
+          assertFileRegex home-path/bin/nnn "$bookmark"
+        done
 
-        assertFileRegex \
-          home-path/bin/nnn \
-          "/nix/store/.*-"{foo,bar}"/bin"
+        for plugin in 'export NNN_PLUG' 'fzcd' 'finder' 'imgview'; do
+          assertFileRegex home-path/bin/nnn "$plugin"
+        done
       '';
     };
   };