initial commit taken from gitlab.lrz.de

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privatereese
2018-08-24 18:09:42 +02:00
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commit fc05486403
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# jest-mock
## API
### `constructor(global)`
Creates a new module mocker that generates mocks as if they were created in an
environment with the given global object.
### `generateFromMetadata(metadata)`
Generates a mock based on the given metadata (Metadata for the mock in the
schema returned by the getMetadata method of this module). Mocks treat functions
specially, and all mock functions have additional members, described in the
documentation for `fn` in this module.
One important note: function prototypes are handled specially by this mocking
framework. For functions with prototypes, when called as a constructor, the mock
will install mocked function members on the instance. This allows different
instances of the same constructor to have different values for its mocks member
and its return values.
### `getMetadata(component)`
Inspects the argument and returns its schema in the following recursive format:
```
{
type: ...
members: {}
}
```
Where type is one of `array`, `object`, `function`, or `ref`, and members is an
optional dictionary where the keys are member names and the values are metadata
objects. Function prototypes are defined simply by defining metadata for the
`member.prototype` of the function. The type of a function prototype should
always be `object`. For instance, a simple class might be defined like this:
```js
const classDef = {
type: 'function',
members: {
staticMethod: {type: 'function'},
prototype: {
type: 'object',
members: {
instanceMethod: {type: 'function'},
},
},
},
};
```
Metadata may also contain references to other objects defined within the same
metadata object. The metadata for the referent must be marked with `refID` key
and an arbitrary value. The referrer must be marked with a `ref` key that has
the same value as object with refID that it refers to. For instance, this
metadata blob:
```js
const refID = {
type: 'object',
refID: 1,
members: {
self: {ref: 1},
},
};
```
defines an object with a slot named `self` that refers back to the object.
### `fn`
Generates a stand-alone function with members that help drive unit tests or
confirm expectations. Specifically, functions returned by this method have the
following members:
##### `.mock`
An object with three members, `calls`, `instances` and `timestamps`, which are
all lists. The items in the `calls` list are the arguments with which the
function was called. The "instances" list stores the value of 'this' for each
call to the function. This is useful for retrieving instances from a
constructor. The `timestamps` list stores a number timestamp every time the mock
is called.
##### `.mockReturnValueOnce(value)`
Pushes the given value onto a FIFO queue of return values for the function.
##### `.mockReturnValue(value)`
Sets the default return value for the function.
##### `.mockImplementationOnce(function)`
Pushes the given mock implementation onto a FIFO queue of mock implementations
for the function.
##### `.mockImplementation(function)`
Sets the default mock implementation for the function.
##### `.mockReturnThis()`
Syntactic sugar for .mockImplementation(function() {return this;})
In case both `mockImplementationOnce()/mockImplementation()` and
`mockReturnValueOnce()/mockReturnValue()` are called. The priority of which to
use is based on what is the last call:
* if the last call is mockReturnValueOnce() or mockReturnValue(), use the
specific return value or default return value. If specific return values are
used up or no default return value is set, fall back to try
mockImplementation();
* if the last call is mockImplementationOnce() or mockImplementation(), run the
specific implementation and return the result or run default implementation
and return the result.

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

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{
"_args": [
[
"jest-mock@^22.4.3",
"/home/bernhard/freifunk-app/node_modules/jest-environment-jsdom"
]
],
"_from": "jest-mock@>=22.4.3 <23.0.0",
"_id": "jest-mock@22.4.3",
"_inCache": true,
"_installable": true,
"_location": "/jest-mock",
"_nodeVersion": "8.9.1",
"_npmOperationalInternal": {
"host": "s3://npm-registry-packages",
"tmp": "tmp/jest-mock_22.4.3_1521648543256_0.23116582422066223"
},
"_npmUser": {
"email": "mjesun@hotmail.com",
"name": "mjesun"
},
"_npmVersion": "5.5.1",
"_phantomChildren": {},
"_requested": {
"name": "jest-mock",
"raw": "jest-mock@^22.4.3",
"rawSpec": "^22.4.3",
"scope": null,
"spec": ">=22.4.3 <23.0.0",
"type": "range"
},
"_requiredBy": [
"/jest-environment-jsdom",
"/jest-environment-node"
],
"_resolved": "https://registry.npmjs.org/jest-mock/-/jest-mock-22.4.3.tgz",
"_shasum": "f63ba2f07a1511772cdc7979733397df770aabc7",
"_shrinkwrap": null,
"_spec": "jest-mock@^22.4.3",
"_where": "/home/bernhard/freifunk-app/node_modules/jest-environment-jsdom",
"browser": "build-es5/index.js",
"bugs": {
"url": "https://github.com/facebook/jest/issues"
},
"dependencies": {},
"description": "## API",
"devDependencies": {},
"directories": {},
"dist": {
"fileCount": 4,
"integrity": "sha512-+4R6mH5M1G4NK16CKg9N1DtCaFmuxhcIqF4lQK/Q1CIotqMs/XBemfpDPeVZBFow6iyUNu6EBT9ugdNOTT5o5Q==",
"shasum": "f63ba2f07a1511772cdc7979733397df770aabc7",
"tarball": "https://registry.npmjs.org/jest-mock/-/jest-mock-22.4.3.tgz",
"unpackedSize": 121007
},
"homepage": "https://github.com/facebook/jest#readme",
"license": "MIT",
"main": "build/index.js",
"maintainers": [
{
"name": "aaronabramov",
"email": "aaron@abramov.io"
},
{
"name": "cpojer",
"email": "christoph.pojer@gmail.com"
},
{
"name": "fb",
"email": "opensource+npm@fb.com"
},
{
"name": "jeanlauliac",
"email": "jean@lauliac.com"
},
{
"name": "mjesun",
"email": "mjesun@hotmail.com"
}
],
"name": "jest-mock",
"optionalDependencies": {},
"readme": "ERROR: No README data found!",
"repository": {
"type": "git",
"url": "git+https://github.com/facebook/jest.git"
},
"version": "22.4.3"
}