make alternating frontend/src to tests/frontend and back working

Author: Norman Köhring

plugin/angular.vim

@@ -153,7 +153,9 @@ function! s:Alternate(cmd) abort
   elseif l:currentpath =~ "public/js"
     let l:newpaths = [substitute(l:currentpath, "public/js", "test/karma/unit", ""), substitute(substitute(l:currentpath, "public/js", "test/karma/unit", ""), ".js", ".spec.js", "")]
   elseif l:currentpath =~ "frontend/src"
-    let l:newpaths = [substitute(l:currentpath, "frontend/src", "test/frontend", "")]
+    let l:newpaths = [substitute(substitute(l:currentpath, "frontend/src", "tests/frontend", ""), ".js", ".spec.js", "")]
+  elseif l:currentpath =~ "tests/frontend"
+    let l:newpaths = [substitute(substitute(l:currentpath, "tests/frontend", "frontend/src", ""), ".spec.js", ".js", "")]
   endif
 
   if l:newpaths != []