See comment inline
================
   private static TestSuite open0(File root, Map tsInfo) throws Fault {
        String[] classPath = StringArray.split((String) (tsInfo.get("classpath")));

        ClassLoader cl;
        if (classPath.length == 0)
            cl = null;
        else {
            try {
                File rootDir = (root.isDirectory() ? root : root.getParentFile());
                URL[] p = new URL[classPath.length];
                for (int i = 0; i < classPath.length; i++) {
                    String cpi = classPath[i];
                    if (cpi.toLowerCase().startsWith("http:"))
                        p[i] = new URL(cpi);
                    else {
                        File f = new File(cpi);
                        if (!f.isAbsolute())
                            f = new File(rootDir, cpi);
// The right conversion would be to call toURI().toURL, not just toURL()
                        p[i] = f.toURL();
                    }
                }
                cl = new URLClassLoader(p, TestSuite.class.getClassLoader());
            }
            catch (MalformedURLException e) {
                throw new Fault(i18n, "ts.badClassPath",
                                new Object[] {root, e.getMessage()});
            }
        }