This tests that visibleCharacterRange returns expected visible ranges while modifying obscured content.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Visible range: {0, 3900}
Visible range (500, 200): {0, 270}
Visible range, offset: 200 (200, 500): {0, 735}
PASS successfullyParsed is true

TEST COMPLETE