Make the test faster, what was done:

Make the test faster, what was done:
1) replaced multiple htmlentities calls with one call to get_html_translation table since they share the same code internally
2) reduced the upper range of the "for" loop to 0x2710 (10000), according to http://www.w3.org/TR/html4/sgml/entities.html it's enough
3) placed additional check to make sure all entities from get_html_translation_table were checked in the test