No coverage report with JSCover

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I am following this guide to generate javascript coverage report on Ubuntu 13.04:

http://tysonlloydcadenhead.com/blog/javascript-test-coverage-with-jscoverage#.UhnokxIW2Y4

I have installed PhantomJS 1.9.1. I have downloaded JSCover-1.0.3 and extracted it into the root of the workspace. The structure looks like this:

workspace
 -> src/core/core.js
 -> src/core/parser.js
 -> test/coreTest/coreTest.js
 -> test/coreTest/parserTest.js
 -> JSCover-1.0.3/target/dist/JSCover-all.jar
 -> JSCover-1.0.3/src/test/javascript/lib/PhantomJS/run-jscover-qunit.js
 -> all_tests.html

First I start the server in the root of the workspace:

workspace$ java -jar JSCover-1.0.3/target/dist/JSCover-all.jar -ws --document-root=. --report-dir=coverage

Next I run the all_tests.html

workspace$ phantomjs JSCover-1.0.3/src/test/javascript/lib/PhantomJS/run-jscover-qunit.js all_tests.htm

'waitFor()' finished in 2457ms.
Tests completed in 2300 milliseconds.
13 assertions of 13 passed, 0 failed.

But when I look in the workspace/coverage dir it only contains (both are empty):

jscover.log 
jscover.log.lck

Why is the coverage report not created?

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Try phantomjs JSCover-1.0.3/src/test/javascript/lib/PhantomJS/run-jscover-qunit.js http://localhost:8080/all_tests.htm