Function checkActiveButton

test/jasmine/tests/range_selector_test.js:480–484

(activeIndex, msg)

    }

    function checkActiveButton(activeIndex, msg) {
        d3SelectAll('.button').each(function(d, i) {
            expect(d._isActive).toBe(activeIndex === i, msg + ': button #' + i);
        });
    }

    function checkButtonColor(bgColor, activeColor) {
        d3SelectAll('.button').each(function(d) {