 goog.graphics.ext.coordinates.isSpecial('50px'));
    assert('50% is special', goog.graphics.ext.coordinates.isSpecial('50%'));
    assert('50 is not special', !goog.graphics.ext.coordinates.isSpecial('50'));
  }

  function testComputeValue() {
    assertEquals('50% of 100 is 50', 50,
        goog.graphics.ext.coordinates.computeValue('50%', 100, null));
    assertEquals('50.5% of 200 is 101', 101,
        goog.graphics.ext.coordinates.computeValue('50.5%', 200, null));
    assertEquals('50px = 25 units w