source: frontend/node_modules/stop-iteration-iterator/test/index.js

'use strict';

var test = require('tape');

var stopIterationIterator = require('../');

test('stopIterationIterator', function (t) {
        t.equal(typeof stopIterationIterator, 'function', 'stopIterationIterator is a function');

        t.test('no StopIteration support', { skip: typeof StopIteration === 'object' }, function (st) {
                st['throws'](
                        // @ts-expect-error
                        function () { stopIterationIterator(); },
                        SyntaxError,
                        'throws a SyntaxError when StopIteration is not supported'
                );

                st.end();
        });

        t.test('StopIteration support', { skip: typeof StopIteration !== 'object' }, function (st) {
                // eslint-disable-next-line no-extra-parens
                var s = /** @type {Set<number> & { iterator(): SetIterator<number>}} */ (new Set([1, 2]));

                var i = s.iterator();
                st.equal(i.next(), 1, 'first item is 1');
                st.equal(i.next(), 2, 'second item is 2');
                try {
                        i.next();
                        st.fail();
                } catch (e) {
                        st.equal(e, StopIteration, 'StopIteration thrown');
                }

                // eslint-disable-next-line no-extra-parens
                var m = /** @type {Map<number, string> & { iterator(): MapIterator<[string, number]>}} */ (new Map([[1, 'a'], [2, 'b']]));
                var mi = m.iterator();
                st.deepEqual(mi.next(), [1, 'a'], 'first item is 1 and a');
                st.deepEqual(mi.next(), [2, 'b'], 'second item is 2 and b');
                try {
                        mi.next();
                        st.fail();
                } catch (e) {
                        st.equal(e, StopIteration, 'StopIteration thrown');
                }

                st.end();
        });

        t.end();
});