source: imaps-frontend/node_modules/object.assign/test/tests.js@ 0c6b92a

'use strict';

var hasSymbols = require('has-symbols/shams')();
var forEach = require('for-each');
var hasOwn = require('hasown');
var mockProperty = require('mock-property');

module.exports = function (assign, t) {
        t.test('error cases', function (st) {
                st['throws'](function () { assign(null); }, TypeError, 'target must be an object');
                st['throws'](function () { assign(undefined); }, TypeError, 'target must be an object');
                st['throws'](function () { assign(null, {}); }, TypeError, 'target must be an object');
                st['throws'](function () { assign(undefined, {}); }, TypeError, 'target must be an object');
                st.end();
        });

        t.test('non-object target, no sources', function (st) {
                var bool = assign(true);
                st.equal(typeof bool, 'object', 'bool is object');
                st.equal(Boolean.prototype.valueOf.call(bool), true, 'bool coerces to `true`');

                var number = assign(1);
                st.equal(typeof number, 'object', 'number is object');
                st.equal(Number.prototype.valueOf.call(number), 1, 'number coerces to `1`');

                var string = assign('1');
                st.equal(typeof string, 'object', 'number is object');
                st.equal(String.prototype.valueOf.call(string), '1', 'number coerces to `"1"`');

                st.end();
        });

        t.test('non-object target, with sources', function (st) {
                var signal = {};

                st.test('boolean', function (st2) {
                        var bool = assign(true, { a: signal });
                        st2.equal(typeof bool, 'object', 'bool is object');
                        st2.equal(Boolean.prototype.valueOf.call(bool), true, 'bool coerces to `true`');
                        st2.equal(bool.a, signal, 'source properties copied');
                        st2.end();
                });

                st.test('number', function (st2) {
                        var number = assign(1, { a: signal });
                        st2.equal(typeof number, 'object', 'number is object');
                        st2.equal(Number.prototype.valueOf.call(number), 1, 'number coerces to `1`');
                        st2.equal(number.a, signal, 'source properties copied');
                        st2.end();
                });

                st.test('string', function (st2) {
                        var string = assign('1', { a: signal });
                        st2.equal(typeof string, 'object', 'number is object');
                        st2.equal(String.prototype.valueOf.call(string), '1', 'number coerces to `"1"`');
                        st2.equal(string.a, signal, 'source properties copied');
                        st2.end();
                });

                st.end();
        });

        t.test('non-object sources', function (st) {
                st.deepEqual(assign({ a: 1 }, null, { b: 2 }), { a: 1, b: 2 }, 'ignores null source');
                st.deepEqual(assign({ a: 1 }, { b: 2 }, undefined), { a: 1, b: 2 }, 'ignores undefined source');
                st.end();
        });

        t.test('returns the modified target object', function (st) {
                var target = {};
                var returned = assign(target, { a: 1 });
                st.equal(returned, target, 'returned object is the same reference as the target object');
                st.end();
        });

        t.test('has the right length', function (st) {
                st.equal(assign.length, 2, 'length is 2 => 2 required arguments');
                st.end();
        });

        t.test('merge two objects', function (st) {
                var target = { a: 1 };
                var returned = assign(target, { b: 2 });
                st.deepEqual(returned, { a: 1, b: 2 }, 'returned object has properties from both');
                st.end();
        });

        t.test('works with functions', function (st) {
                var target = function () {};
                target.a = 1;
                var returned = assign(target, { b: 2 });
                st.equal(target, returned, 'returned object is target');
                st.equal(returned.a, 1);
                st.equal(returned.b, 2);
                st.end();
        });

        t.test('works with primitives', function (st) {
                var target = 2;
                var source = { b: 42 };
                var returned = assign(target, source);
                st.equal(Object.prototype.toString.call(returned), '[object Number]', 'returned is object form of number primitive');
                st.equal(Number(returned), target, 'returned and target have same valueOf');
                st.equal(returned.b, source.b);
                st.end();
        });

        /* globals window */
        t.test('works with window.location', { skip: typeof window === 'undefined' }, function (st) {
                var target = {};
                assign(target, window.location);
                for (var prop in window.location) {
                        if (hasOwn(window.location, prop)) {
                                st.deepEqual(target[prop], window.location[prop], prop + ' is copied');
                        }
                }
                st.end();
        });

        t.test('merge N objects', function (st) {
                var target = { a: 1 };
                var source1 = { b: 2 };
                var source2 = { c: 3 };
                var returned = assign(target, source1, source2);
                st.deepEqual(returned, { a: 1, b: 2, c: 3 }, 'returned object has properties from all sources');
                st.end();
        });

        t.test('only iterates over own keys', function (st) {
                var Foo = function () {};
                Foo.prototype.bar = true;
                var foo = new Foo();
                foo.baz = true;
                var target = { a: 1 };
                var returned = assign(target, foo);
                st.equal(returned, target, 'returned object is the same reference as the target object');
                st.deepEqual(target, { a: 1, baz: true }, 'returned object has only own properties from both');
                st.end();
        });

        t.test('includes enumerable symbols, after keys', { skip: !hasSymbols }, function (st) {
                var visited = [];
                var obj = {};
                Object.defineProperty(obj, 'a', { enumerable: true, get: function () { visited.push('a'); return 42; } });
                var symbol = Symbol('enumerable');
                Object.defineProperty(obj, symbol, {
                        enumerable: true,
                        get: function () { visited.push(symbol); return Infinity; }
                });
                var nonEnumSymbol = Symbol('non-enumerable');
                Object.defineProperty(obj, nonEnumSymbol, {
                        enumerable: false,
                        get: function () { visited.push(nonEnumSymbol); return -Infinity; }
                });
                var target = assign({}, obj);
                st.deepEqual(visited, ['a', symbol], 'key is visited first, then symbol');
                st.equal(target.a, 42, 'target.a is 42');
                st.equal(target[symbol], Infinity, 'target[symbol] is Infinity');
                st.notEqual(target[nonEnumSymbol], -Infinity, 'target[nonEnumSymbol] is not -Infinity');
                st.end();
        });

        t.test('does not fail when symbols are not present', { skip: !Object.isFrozen || Object.isFrozen(Object) }, function (st) {
                st.teardown(mockProperty(Object, 'getOwnPropertySymbols', { 'delete': true }));

                var visited = [];
                var obj = {};
                Object.defineProperty(obj, 'a', { enumerable: true, get: function () { visited.push('a'); return 42; } });
                var keys = ['a'];
                if (hasSymbols) {
                        var symbol = Symbol('sym');
                        Object.defineProperty(obj, symbol, {
                                enumerable: true,
                                get: function () { visited.push(symbol); return Infinity; }
                        });
                        keys.push(symbol);
                }
                var target = assign({}, obj);
                st.deepEqual(visited, keys, 'assign visits expected keys');
                st.equal(target.a, 42, 'target.a is 42');

                if (hasSymbols) {
                        st.equal(target[symbol], Infinity);
                }
                st.end();
        });

        t.test('preserves correct property enumeration order', function (st) {
                var str = 'abcdefghijklmnopqrst';
                var letters = {};
                forEach(str.split(''), function (letter) {
                        letters[letter] = letter;
                });

                var n = 5;
                st.comment('run the next test ' + n + ' times');
                var object = assign({}, letters);
                var actual = '';
                for (var k in object) {
                        actual += k;
                }
                for (var i = 0; i < n; ++i) {
                        st.equal(actual, str, 'property enumeration order should be followed');
                }
                st.end();
        });

        t.test('checks enumerability and existence, in case of modification during [[Get]]', { skip: !Object.defineProperty }, function (st) {
                var targetBvalue = {};
                var targetCvalue = {};
                var target = { b: targetBvalue, c: targetCvalue };
                var source = {};
                Object.defineProperty(source, 'a', {
                        enumerable: true,
                        get: function () {
                                delete this.b;
                                Object.defineProperty(this, 'c', { enumerable: false });
                                return 'a';
                        }
                });
                var sourceBvalue = {};
                var sourceCvalue = {};
                source.b = sourceBvalue;
                source.c = sourceCvalue;
                var result = assign(target, source);
                st.equal(result, target, 'sanity check: result is === target');
                st.equal(result.b, targetBvalue, 'target key not overwritten by deleted source key');
                st.equal(result.c, targetCvalue, 'target key not overwritten by non-enumerable source key');

                st.end();
        });
};