fix README_maintainers, provide debug output for invalid invocations

README_maintainers.md

@@ -284,16 +284,16 @@ valgrind could look like this. Options are passed as regular long values in the
 syntax --option value --sub:option value. Using Valgrind could look like this:
 
     ./scripts/unittest single_server --test js/server/tests/aql/aql-escaping.js \
-      --extraargs:server.threads 1 \
-      --extraargs:scheduler.threads 1 \
-      --extraargs:javascript.gc-frequency 1000000 \
-      --extraargs:javascript.gc-interval 65536 \
+      --extraArgs:server.threads 1 \
+      --extraArgs:scheduler.threads 1 \
+      --extraArgs:javascript.gc-frequency 1000000 \
+      --extraArgs:javascript.gc-interval 65536 \
       --javascript.v8-contexts 2 \
       --valgrind /usr/bin/valgrind \
       --valgrindargs:log-file /tmp/valgrindlog.%p
 
  - we specify the test to execute
- - we specify some arangod arguments via --extraargs which increase the server performance
+ - we specify some arangod arguments via --extraArgs which increase the server performance
  - we specify to run using valgrind (this is supported by all facilities)
  - we specify some valgrind commandline arguments
 

UnitTests/unittest.js

@@ -178,7 +178,8 @@ function main(argv) {
         options = internal.parseArgv(argv, 0); // parse option with parseArgv function
       }
     } catch (x) {
-      print("failed to parse the json options: " + x.message);
+      print("failed to parse the json options: " + x.message + "\n" + String(x.stack));
+      print("argv: ", argv);
       return -1;
     }
   }