Using element.find() by class in Angular Unit testing

When running this test, I keep getting the error Expected undefined to be true.

it('should have the right classes', function() {
   // this doesnt work
   expect(element.find('.exampleClass').hasClass('ng-hide')).toBe(true);

   // but this works
   expect(element.find('span').hasClass('ng-hide')).toBe(true);
});

How can I use jqlite to find an element by id and class?