it('should handle every item being in one group', () => {
var items = ['hello', 'world', 'foo', 'bar'];
var groupFn = item => 'lol';
var result = groupArray(items, groupFn);
expect(Object.keys(result).length).toBe(1);
expect(result.lol).toEqual(items);
});
it('should handle two items in the same group', () => {
var items = ['hello', 'world', 'test'];
var groupFn = item => item.length;
var result = groupArray(items, groupFn);
expect(Object.keys(result).length).toBe(2);
expect(result[5]).toEqual(['hello', 'world']);
expect(result[4]).toEqual(['test']);
});
it('should handle every item being in a different group', () => {
var items = ['hello', 'world', 'foo', 'bar'];
var groupFn = item => 'group_' + item;
var result = groupArray(items, groupFn);
expect(Object.keys(result).length).toBe(items.length);
expect(result.group_hello).toEqual(['hello']);
expect(result.group_world).toEqual(['world']);
expect(result.group_foo).toEqual(['foo']);
expect(result.group_bar).toEqual(['bar']);
});
it('should handle empty arrays', () => {
var result = groupArray([], item => 'lol');
expect(Object.keys(result).length).toBe(0);
});