800 lines
20 KiB
JavaScript
800 lines
20 KiB
JavaScript
'use strict';
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const MOCK_CONSTRUCTOR_NAME = 'mockConstructor'; /**
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* Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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*
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*/const FUNCTION_NAME_RESERVED_PATTERN = /[\s!-\/:-@\[-`{-~]/;const FUNCTION_NAME_RESERVED_REPLACE = new RegExp(FUNCTION_NAME_RESERVED_PATTERN.source, 'g');
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const RESERVED_KEYWORDS = Object.assign(Object.create(null), {
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arguments: true,
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await: true,
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break: true,
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case: true,
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catch: true,
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class: true,
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const: true,
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continue: true,
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debugger: true,
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default: true,
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delete: true,
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do: true,
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else: true,
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enum: true,
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eval: true,
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export: true,
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extends: true,
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false: true,
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finally: true,
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for: true,
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function: true,
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if: true,
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implements: true,
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import: true,
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in: true,
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instanceof: true,
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interface: true,
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let: true,
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new: true,
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null: true,
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package: true,
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private: true,
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protected: true,
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public: true,
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return: true,
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static: true,
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super: true,
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switch: true,
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this: true,
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throw: true,
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true: true,
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try: true,
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typeof: true,
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var: true,
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void: true,
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while: true,
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with: true,
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yield: true });
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function matchArity(fn, length) {
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let mockConstructor;
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switch (length) {
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case 1:
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mockConstructor = function (a) {
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return fn.apply(this, arguments);
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};
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break;
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case 2:
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mockConstructor = function (a, b) {
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return fn.apply(this, arguments);
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};
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break;
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case 3:
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mockConstructor = function (a, b, c) {
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return fn.apply(this, arguments);
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};
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break;
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case 4:
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mockConstructor = function (a, b, c, d) {
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return fn.apply(this, arguments);
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};
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break;
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case 5:
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mockConstructor = function (a, b, c, d, e) {
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return fn.apply(this, arguments);
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};
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break;
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case 6:
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mockConstructor = function (a, b, c, d, e, f) {
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return fn.apply(this, arguments);
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};
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break;
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case 7:
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mockConstructor = function (a, b, c, d, e, f, g) {
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return fn.apply(this, arguments);
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};
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break;
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case 8:
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mockConstructor = function (a, b, c, d, e, f, g, h) {
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return fn.apply(this, arguments);
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};
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break;
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case 9:
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mockConstructor = function (a, b, c, d, e, f, g, h, i) {
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return fn.apply(this, arguments);
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};
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break;
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default:
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mockConstructor = function () {
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return fn.apply(this, arguments);
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};
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break;}
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return mockConstructor;
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}
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function isA(typeName, value) {
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return Object.prototype.toString.apply(value) === '[object ' + typeName + ']';
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}
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function getType(ref) {
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if (isA('Function', ref) || isA('AsyncFunction', ref)) {
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return 'function';
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} else if (Array.isArray(ref)) {
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return 'array';
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} else if (isA('Object', ref)) {
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return 'object';
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} else if (
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isA('Number', ref) ||
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isA('String', ref) ||
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isA('Boolean', ref) ||
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isA('Symbol', ref))
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{
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return 'constant';
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} else if (isA('Map', ref) || isA('WeakMap', ref) || isA('Set', ref)) {
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return 'collection';
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} else if (isA('RegExp', ref)) {
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return 'regexp';
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} else if (ref === undefined) {
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return 'undefined';
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} else if (ref === null) {
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return 'null';
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} else {
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return null;
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}
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}
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function isReadonlyProp(object, prop) {
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return (
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(prop === 'arguments' ||
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prop === 'caller' ||
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prop === 'callee' ||
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prop === 'name' ||
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prop === 'length') && (
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isA('Function', object) || isA('AsyncFunction', object)) ||
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(prop === 'source' ||
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prop === 'global' ||
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prop === 'ignoreCase' ||
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prop === 'multiline') &&
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isA('RegExp', object));
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}
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function getSlots(object) {
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const slots = {};
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if (!object) {
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return [];
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}
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let parent = Object.getPrototypeOf(object);
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do {
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if (object === Object.getPrototypeOf(Function)) {
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break;
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}
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const ownNames = Object.getOwnPropertyNames(object);
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for (let i = 0; i < ownNames.length; i++) {
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const prop = ownNames[i];
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if (!isReadonlyProp(object, prop)) {
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const propDesc = Object.getOwnPropertyDescriptor(object, prop);
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if (!propDesc.get || object.__esModule) {
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slots[prop] = true;
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}
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}
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}
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object = parent;
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} while (object && (parent = Object.getPrototypeOf(object)) !== null);
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return Object.keys(slots);
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}
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function wrapAsyncParam(
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fn,
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asyncAction)
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{
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if (asyncAction === 'reject') {
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return value => fn(Promise.reject(value));
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}
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return value => fn(Promise.resolve(value));
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}
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class ModuleMockerClass {
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/**
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* @see README.md
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* @param global Global object of the test environment, used to create
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* mocks
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*/
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constructor(global) {
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this._environmentGlobal = global;
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this._mockState = new WeakMap();
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this._mockConfigRegistry = new WeakMap();
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this._spyState = new Set();
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this.ModuleMocker = ModuleMockerClass;
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}
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_ensureMockConfig(f) {
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let config = this._mockConfigRegistry.get(f);
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if (!config) {
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config = this._defaultMockConfig();
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this._mockConfigRegistry.set(f, config);
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}
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return config;
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}
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_ensureMockState(f) {
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let state = this._mockState.get(f);
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if (!state) {
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state = this._defaultMockState();
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this._mockState.set(f, state);
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}
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return state;
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}
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_defaultMockConfig() {
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return {
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defaultReturnValue: undefined,
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isReturnValueLastSet: false,
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mockImpl: undefined,
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mockName: 'jest.fn()',
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specificMockImpls: [],
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specificReturnValues: [] };
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}
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_defaultMockState() {
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return {
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calls: [],
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instances: [],
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timestamps: [] };
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}
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_makeComponent(metadata, restore) {
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if (metadata.type === 'object') {
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return new this._environmentGlobal.Object();
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} else if (metadata.type === 'array') {
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return new this._environmentGlobal.Array();
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} else if (metadata.type === 'regexp') {
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return new this._environmentGlobal.RegExp('');
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} else if (
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metadata.type === 'constant' ||
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metadata.type === 'collection' ||
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metadata.type === 'null' ||
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metadata.type === 'undefined')
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{
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return metadata.value;
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} else if (metadata.type === 'function') {
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/* eslint-disable prefer-const */
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let f;
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/* eslint-enable prefer-const */
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const prototype =
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metadata.members &&
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metadata.members.prototype &&
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metadata.members.prototype.members ||
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{};
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const prototypeSlots = getSlots(prototype);
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const mocker = this;
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const mockConstructor = matchArity(function () {
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const mockState = mocker._ensureMockState(f);
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const mockConfig = mocker._ensureMockConfig(f);
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mockState.instances.push(this);
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mockState.calls.push(Array.prototype.slice.call(arguments));
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mockState.timestamps.push(Date.now());
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if (this instanceof f) {
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// This is probably being called as a constructor
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prototypeSlots.forEach(slot => {
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// Copy prototype methods to the instance to make
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// it easier to interact with mock instance call and
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// return values
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if (prototype[slot].type === 'function') {
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const protoImpl = this[slot];
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this[slot] = mocker.generateFromMetadata(prototype[slot]);
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this[slot]._protoImpl = protoImpl;
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}
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});
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// Run the mock constructor implementation
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const mockImpl = mockConfig.specificMockImpls.length ?
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mockConfig.specificMockImpls.shift() :
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mockConfig.mockImpl;
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return mockImpl && mockImpl.apply(this, arguments);
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}
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const returnValue = mockConfig.defaultReturnValue;
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// If return value is last set, either specific or default, i.e.
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// mockReturnValueOnce()/mockReturnValue() is called and no
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// mockImplementationOnce()/mockImplementation() is called after that.
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// use the set return value.
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if (mockConfig.specificReturnValues.length) {
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return mockConfig.specificReturnValues.shift();
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}
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if (mockConfig.isReturnValueLastSet) {
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return mockConfig.defaultReturnValue;
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}
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// If mockImplementationOnce()/mockImplementation() is last set,
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// or specific return values are used up, use the mock implementation.
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let specificMockImpl;
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if (returnValue === undefined) {
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specificMockImpl = mockConfig.specificMockImpls.shift();
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if (specificMockImpl === undefined) {
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specificMockImpl = mockConfig.mockImpl;
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}
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if (specificMockImpl) {
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return specificMockImpl.apply(this, arguments);
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}
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}
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// Otherwise use prototype implementation
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if (returnValue === undefined && f._protoImpl) {
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return f._protoImpl.apply(this, arguments);
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}
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return returnValue;
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}, metadata.length || 0);
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f = this._createMockFunction(metadata, mockConstructor);
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f._isMockFunction = true;
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f.getMockImplementation = () => this._ensureMockConfig(f).mockImpl;
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if (typeof restore === 'function') {
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this._spyState.add(restore);
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}
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this._mockState.set(f, this._defaultMockState());
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this._mockConfigRegistry.set(f, this._defaultMockConfig());
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// $FlowFixMe - defineProperty getters not supported
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Object.defineProperty(f, 'mock', {
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configurable: false,
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enumerable: true,
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get: () => this._ensureMockState(f),
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set: val => this._mockState.set(f, val) });
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f.mockClear = () => {
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this._mockState.delete(f);
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return f;
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};
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f.mockReset = () => {
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this._mockState.delete(f);
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this._mockConfigRegistry.delete(f);
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return f;
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};
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f.mockReturnValueOnce = value => {
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// next function call will return this value or default return value
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const mockConfig = this._ensureMockConfig(f);
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mockConfig.specificReturnValues.push(value);
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return f;
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};
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f.mockResolvedValueOnce = wrapAsyncParam(
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f.mockReturnValueOnce,
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'resolve');
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f.mockRejectedValueOnce = wrapAsyncParam(f.mockReturnValueOnce, 'reject');
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f.mockReturnValue = value => {
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// next function call will return specified return value or this one
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const mockConfig = this._ensureMockConfig(f);
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mockConfig.isReturnValueLastSet = true;
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mockConfig.defaultReturnValue = value;
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return f;
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};
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f.mockResolvedValue = wrapAsyncParam(f.mockReturnValue, 'resolve');
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f.mockRejectedValue = wrapAsyncParam(f.mockReturnValue, 'reject');
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f.mockImplementationOnce = fn => {
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// next function call will use this mock implementation return value
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// or default mock implementation return value
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const mockConfig = this._ensureMockConfig(f);
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mockConfig.isReturnValueLastSet = false;
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mockConfig.specificMockImpls.push(fn);
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return f;
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};
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f.mockImplementation = fn => {
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// next function call will use mock implementation return value
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const mockConfig = this._ensureMockConfig(f);
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mockConfig.isReturnValueLastSet = false;
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mockConfig.defaultReturnValue = undefined;
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mockConfig.mockImpl = fn;
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return f;
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};
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f.mockReturnThis = () =>
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f.mockImplementation(function () {
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return this;
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});
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f.mockName = name => {
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if (name) {
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const mockConfig = this._ensureMockConfig(f);
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mockConfig.mockName = name;
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}
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return f;
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};
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f.getMockName = () => {
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const mockConfig = this._ensureMockConfig(f);
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return mockConfig.mockName || 'jest.fn()';
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};
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if (metadata.mockImpl) {
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f.mockImplementation(metadata.mockImpl);
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}
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f.mockRestore = restore ? restore : () => {};
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return f;
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} else {
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const unknownType = metadata.type || 'undefined type';
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throw new Error('Unrecognized type ' + unknownType);
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}
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}
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_createMockFunction(
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metadata,
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mockConstructor)
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{
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let name = metadata.name;
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if (!name) {
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return mockConstructor;
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}
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// Preserve `name` property of mocked function.
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const boundFunctionPrefix = 'bound ';
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let bindCall = '';
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// if-do-while for perf reasons. The common case is for the if to fail.
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if (name && name.startsWith(boundFunctionPrefix)) {
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do {
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name = name.substring(boundFunctionPrefix.length);
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// Call bind() just to alter the function name.
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bindCall = '.bind(null)';
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} while (name && name.startsWith(boundFunctionPrefix));
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}
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// Special case functions named `mockConstructor` to guard for infinite
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// loops.
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if (name === MOCK_CONSTRUCTOR_NAME) {
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return mockConstructor;
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}
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// It's a syntax error to define functions with a reserved keyword
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// as name.
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if (RESERVED_KEYWORDS[name]) {
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name = '$' + name;
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}
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// It's also a syntax error to define a function with a reserved character
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// as part of it's name.
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if (FUNCTION_NAME_RESERVED_PATTERN.test(name)) {
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name = name.replace(FUNCTION_NAME_RESERVED_REPLACE, '$');
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}
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const body =
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'return function ' +
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name +
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'() {' +
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'return ' +
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MOCK_CONSTRUCTOR_NAME +
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'.apply(this,arguments);' +
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'}' +
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bindCall;
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const createConstructor = new this._environmentGlobal.Function(
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MOCK_CONSTRUCTOR_NAME,
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body);
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return createConstructor(mockConstructor);
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}
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_generateMock(
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metadata,
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callbacks,
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refs)
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{
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const mock = this._makeComponent(metadata);
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if (metadata.refID != null) {
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refs[metadata.refID] = mock;
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}
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getSlots(metadata.members).forEach(slot => {
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const slotMetadata = metadata.members && metadata.members[slot] || {};
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if (slotMetadata.ref != null) {
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callbacks.push(() => mock[slot] = refs[slotMetadata.ref]);
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} else {
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mock[slot] = this._generateMock(slotMetadata, callbacks, refs);
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}
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});
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if (
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metadata.type !== 'undefined' &&
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metadata.type !== 'null' &&
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mock.prototype)
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{
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mock.prototype.constructor = mock;
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}
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return mock;
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}
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/**
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* @see README.md
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* @param metadata Metadata for the mock in the schema returned by the
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* getMetadata method of this module.
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*/
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generateFromMetadata(_metadata) {
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const callbacks = [];
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const refs = {};
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const mock = this._generateMock(_metadata, callbacks, refs);
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callbacks.forEach(setter => setter());
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return mock;
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}
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/**
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* @see README.md
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* @param component The component for which to retrieve metadata.
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*/
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getMetadata(component, _refs) {
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const refs = _refs || new Map();
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const ref = refs.get(component);
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if (ref != null) {
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return { ref };
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}
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const type = getType(component);
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|
if (!type) {
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return null;
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}
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const metadata = { type };
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|
if (
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type === 'constant' ||
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|
type === 'collection' ||
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type === 'undefined' ||
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type === 'null')
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|
{
|
|
metadata.value = component;
|
|
return metadata;
|
|
} else if (type === 'function') {
|
|
metadata.name = component.name;
|
|
if (component._isMockFunction) {
|
|
metadata.mockImpl = component.getMockImplementation();
|
|
}
|
|
}
|
|
|
|
metadata.refID = refs.size;
|
|
refs.set(component, metadata.refID);
|
|
|
|
let members = null;
|
|
// Leave arrays alone
|
|
if (type !== 'array') {
|
|
if (type !== 'undefined') {
|
|
getSlots(component).forEach(slot => {
|
|
if (
|
|
type === 'function' &&
|
|
component._isMockFunction &&
|
|
slot.match(/^mock/))
|
|
{
|
|
return;
|
|
}
|
|
|
|
if (
|
|
!component.hasOwnProperty && component[slot] !== undefined ||
|
|
component.hasOwnProperty && component.hasOwnProperty(slot) ||
|
|
type === 'object' && component[slot] != Object.prototype[slot])
|
|
{
|
|
const slotMetadata = this.getMetadata(component[slot], refs);
|
|
if (slotMetadata) {
|
|
if (!members) {
|
|
members = {};
|
|
}
|
|
members[slot] = slotMetadata;
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
// If component is native code function, prototype might be undefined
|
|
if (type === 'function' && component.prototype) {
|
|
const prototype = this.getMetadata(component.prototype, refs);
|
|
if (prototype && prototype.members) {
|
|
if (!members) {
|
|
members = {};
|
|
}
|
|
members.prototype = prototype;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (members) {
|
|
metadata.members = members;
|
|
}
|
|
|
|
return metadata;
|
|
}
|
|
|
|
isMockFunction(fn) {
|
|
return !!(fn && fn._isMockFunction);
|
|
}
|
|
|
|
fn(implementation) {
|
|
const length = implementation ? implementation.length : 0;
|
|
const fn = this._makeComponent({ length, type: 'function' });
|
|
if (implementation) {
|
|
fn.mockImplementation(implementation);
|
|
}
|
|
return fn;
|
|
}
|
|
|
|
spyOn(object, methodName, accessType) {
|
|
if (accessType) {
|
|
return this._spyOnProperty(object, methodName, accessType);
|
|
}
|
|
|
|
if (typeof object !== 'object' && typeof object !== 'function') {
|
|
throw new Error(
|
|
'Cannot spyOn on a primitive value; ' + this._typeOf(object) + ' given');
|
|
|
|
}
|
|
|
|
const original = object[methodName];
|
|
|
|
if (!this.isMockFunction(original)) {
|
|
if (typeof original !== 'function') {
|
|
throw new Error(
|
|
'Cannot spy the ' +
|
|
methodName +
|
|
' property because it is not a function; ' +
|
|
this._typeOf(original) +
|
|
' given instead');
|
|
|
|
}
|
|
|
|
object[methodName] = this._makeComponent({ type: 'function' }, () => {
|
|
object[methodName] = original;
|
|
});
|
|
|
|
object[methodName].mockImplementation(function () {
|
|
return original.apply(this, arguments);
|
|
});
|
|
}
|
|
|
|
return object[methodName];
|
|
}
|
|
|
|
_spyOnProperty(obj, propertyName) {let accessType = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'get';
|
|
if (typeof obj !== 'object' && typeof obj !== 'function') {
|
|
throw new Error(
|
|
'Cannot spyOn on a primitive value; ' + this._typeOf(obj) + ' given');
|
|
|
|
}
|
|
|
|
if (!obj) {
|
|
throw new Error(
|
|
'spyOn could not find an object to spy upon for ' + propertyName + '');
|
|
|
|
}
|
|
|
|
if (!propertyName) {
|
|
throw new Error('No property name supplied');
|
|
}
|
|
|
|
const descriptor = Object.getOwnPropertyDescriptor(obj, propertyName);
|
|
|
|
if (!descriptor) {
|
|
throw new Error(propertyName + ' property does not exist');
|
|
}
|
|
|
|
if (!descriptor.configurable) {
|
|
throw new Error(propertyName + ' is not declared configurable');
|
|
}
|
|
|
|
if (!descriptor[accessType]) {
|
|
throw new Error(
|
|
'Property ' + propertyName + ' does not have access type ' + accessType);
|
|
|
|
}
|
|
|
|
const original = descriptor[accessType];
|
|
|
|
if (!this.isMockFunction(original)) {
|
|
if (typeof original !== 'function') {
|
|
throw new Error(
|
|
'Cannot spy the ' +
|
|
propertyName +
|
|
' property because it is not a function; ' +
|
|
this._typeOf(original) +
|
|
' given instead');
|
|
|
|
}
|
|
|
|
descriptor[accessType] = this._makeComponent({ type: 'function' }, () => {
|
|
descriptor[accessType] = original;
|
|
Object.defineProperty(obj, propertyName, descriptor);
|
|
});
|
|
|
|
descriptor[accessType].mockImplementation(function () {
|
|
return original.apply(this, arguments);
|
|
});
|
|
}
|
|
|
|
Object.defineProperty(obj, propertyName, descriptor);
|
|
return descriptor[accessType];
|
|
}
|
|
|
|
clearAllMocks() {
|
|
this._mockState = new WeakMap();
|
|
}
|
|
|
|
resetAllMocks() {
|
|
this._mockConfigRegistry = new WeakMap();
|
|
this._mockState = new WeakMap();
|
|
}
|
|
|
|
restoreAllMocks() {
|
|
this._spyState.forEach(restore => restore());
|
|
this._spyState = new Set();
|
|
}
|
|
|
|
_typeOf(value) {
|
|
return value == null ? '' + value : typeof value;
|
|
}}
|
|
|
|
|
|
|
|
module.exports = new ModuleMockerClass(global); |