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Diffstat (limited to 'node_modules/object.assign/test/tests.js')
-rw-r--r-- | node_modules/object.assign/test/tests.js | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/node_modules/object.assign/test/tests.js b/node_modules/object.assign/test/tests.js new file mode 100644 index 000000000..34f6f2c19 --- /dev/null +++ b/node_modules/object.assign/test/tests.js @@ -0,0 +1,224 @@ +'use strict'; + +var hasSymbols = require('has-symbols/shams')(); +var forEach = require('for-each'); + +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'); + st.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(); + }); + + 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', function (st) { + var getSyms; + if (hasSymbols) { + getSyms = Object.getOwnPropertySymbols; + delete Object.getOwnPropertySymbols; + } + + 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); + + Object.getOwnPropertySymbols = getSyms; + } + 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(); + }); +}; |