source: frontend/node_modules/side-channel-list/test/index.js

'use strict';

var test = require('tape');

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

test('getSideChannelList', function (t) {
        t.test('export', function (st) {
                st.equal(typeof getSideChannelList, 'function', 'is a function');

                st.equal(getSideChannelList.length, 0, 'takes no arguments');

                var channel = getSideChannelList();
                st.ok(channel, 'is truthy');
                st.equal(typeof channel, 'object', 'is an object');
                st.end();
        });

        t.test('assert', function (st) {
                var channel = getSideChannelList();
                st['throws'](
                        function () { channel.assert({}); },
                        TypeError,
                        'nonexistent value throws'
                );

                var o = {};
                channel.set(o, 'data');
                st.doesNotThrow(function () { channel.assert(o); }, 'existent value noops');

                st.end();
        });

        t.test('has', function (st) {
                var channel = getSideChannelList();
                /** @type {unknown[]} */ var o = [];

                st.equal(channel.has(o), false, 'nonexistent value yields false');

                channel.set(o, 'foo');
                st.equal(channel.has(o), true, 'existent value yields true');

                st.equal(channel.has('abc'), false, 'non object value non existent yields false');

                channel.set('abc', 'foo');
                st.equal(channel.has('abc'), true, 'non object value that exists yields true');

                st.end();
        });

        t.test('get', function (st) {
                var channel = getSideChannelList();
                var o = {};
                st.equal(channel.get(o), undefined, 'nonexistent value yields undefined');

                var data = {};
                channel.set(o, data);
                st.equal(channel.get(o), data, '"get" yields data set by "set"');

                st.end();
        });

        t.test('set', function (st) {
                var channel = getSideChannelList();
                var o = function () {};
                st.equal(channel.get(o), undefined, 'value not set');

                channel.set(o, 42);
                st.equal(channel.get(o), 42, 'value was set');

                channel.set(o, Infinity);
                st.equal(channel.get(o), Infinity, 'value was set again');

                var o2 = {};
                channel.set(o2, 17);
                st.equal(channel.get(o), Infinity, 'o is not modified');
                st.equal(channel.get(o2), 17, 'o2 is set');

                channel.set(o, 14);
                st.equal(channel.get(o), 14, 'o is modified');
                st.equal(channel.get(o2), 17, 'o2 is not modified');

                st.end();
        });

        t.test('delete', function (st) {
                var channel = getSideChannelList();
                var o = {};
                st.equal(channel['delete']({}), false, 'nonexistent value yields false');

                channel.set(o, 42);
                st.equal(channel.has(o), true, 'value is set');

                st.equal(channel['delete']({}), false, 'nonexistent value still yields false');

                st.equal(channel['delete'](o), true, 'deleted value yields true');

                st.equal(channel.has(o), false, 'value is no longer set');

                st.end();
        });

        t.test('delete: first node in a multi-node list', function (st) {
                var channel = getSideChannelList();

                channel.set('a', 1);
                channel.set('b', 2);

                st.equal(channel['delete']('b'), true, 'deleting first data node yields true');

                st.equal(channel.has('a'), true, 'second node is still present after deleting first');
                st.equal(channel.get('a'), 1, 'second node value is intact after deleting first');
                st.equal(channel.has('b'), false, 'deleted node is gone');

                st.end();
        });

        t.test('delete: last remaining node empties the list', function (st) {
                var channel = getSideChannelList();

                channel.set('a', 1);
                channel.set('b', 2);

                st.equal(channel['delete']('b'), true, 'delete first node');
                st.equal(channel['delete']('a'), true, 'delete second (last) node');

                st.equal(channel.has('a'), false, 'a is gone');
                st.equal(channel.has('b'), false, 'b is gone');
                st.equal(channel.get('a'), undefined, 'get a yields undefined');

                channel.set('c', 3);
                st.equal(channel.get('c'), 3, 'can set new values after emptying');

                st.end();
        });

        t.test('delete: middle node in a multi-node list', function (st) {
                var channel = getSideChannelList();

                channel.set('a', 1);
                channel.set('b', 2);
                channel.set('c', 3);

                st.equal(channel['delete']('b'), true, 'deleting middle node yields true');

                st.equal(channel.get('a'), 1, 'first node still intact');
                st.equal(channel.has('b'), false, 'middle node is gone');
                st.equal(channel.get('c'), 3, 'last node still intact');

                st.end();
        });

        t.end();
});