function checkFont(opt, expectedLabel) {
        const expected = testFonts[expectedLabel];

        util.forEach(expected, (item, key) => {
          assert.equal(opt[key], item);
        });
      }
Check that setting options for multi-font works as expected

- using multi-font 'bold' for test, the rest should work analogously
- using multi-font option 'color' for test, the rest should work analogously
- edges have no groups