jest spy on class method

Solutions on MaxInterview for jest spy on class method by the best coders in the world

Search
showing results for - "jest spy on class method"
Ella
05 Nov 2017
1test("es6 class", () => {
2    const SomeClass = jest.fn();
3    const mMock = jest.fn();
4
5    SomeClass.mockImplementation(() => {
6      return {
7        m: mMock
8      };
9    });
10
11    const some = new SomeClass();
12    some.m("a", "b");
13    expect(mMock.mock.calls).toEqual([["a", "b"]]);
14  });
Nayla
18 Feb 2018
1//class.js
2class MyClass {
3  methodOne() {
4    return 1;
5  }
6  methodTwo() {
7    return 2;
8  }
9}
10module.exports = MyClass;
11
12// class.test.js
13test('spy using class method', () => {
14  const result = new MyClass()
15  const spy = jest.spyOn(result, 'methodOne')
16  result.methodOne()
17
18  // check class method is call or not
19  expect(spy).toHaveBeenCalled()
20
21  // expect old value
22  expect(result.methodOne()).toBe(1)
23
24  // expect new value
25  spy.mockReturnValueOnce(12)
26  expect(result.methodOne()).toBe(12)
27})
similar questions
testing with jestjavascript troubleshooting with jestjest supertestjest mock calljest spyonjest mock instancejest manual mock node modulejest expect error typejest mock implementationwhat is jestjasmine spy return value when using create spy object angular 2it in jestexpect any function jesthow to mock a library in jest
queries leading to this page
how to mock the object of a library in jestmock class property jsjest mock es6 class functionjest declare functionhow to spyon methods in jestusing mock es6 class jestjest mock functionjest mock functionsjest mock when called withjest mpck class variablemock data jestjest mock documentationspy on class method jestjest mock new instance jest mockmock constructor parameters jestjest mock method on objectspyonjest class mock typescriptes6 modules mock jesthow to mock method from inerithed class jestjest spy objectjest style mockjest mock 3fjest spy on a functionhow to mock object in jestjest spyon with function implementationany mock constructor jestjest spy classhow to mock a class file with jestjest spy on function being calledcreate a spy with jestjest mock all methodsjest mock 28jest mock class method requirespyon function in class jestcreate mock class jestjest spyon one methodjest mock for all projecthow to mock class constructor jestjest mock object methodsjest spy on method of classas jest mockjest mock use class functionmock constructor jestjest mock functinjest mock method for classmock an entire class jestjest spyon method inside objectjest get mock implementationjest mock a functionmock method jest classsmock es6 exprt jestmock data with jestjest mock implement classjest mock 28 29 coursejest mock library with constructorjest mock entire classjest classes functionhow to mock constructor jestjest spyon all methodsjest spy on method of under test classmock object data in jestjest spy on class functionspy using jestjest mock class methodjest how to spy inside a new instance inside methodmock a class constructor jestspyon a mockhow to mock objects in jestjest spy constructorjavascript test class function examplespy on jest functionfunction need to spy on jestjest global mockjest create mock classmock function in jestjest spy on class instance methodmock class instance jestmock component method jestjest how to spy inside a new instance in functionjest mock class componentjest mock implementationmethod mock jestjest spy on component methodmock method on class jestjest create mock instance of classjest spyonmock value jestjest mock class objectjest mock class instancejest spy on object methodjest set instance class mockjest mock constructor mockimplementationmock property jestjest spy on class methodhow to test class in jestneed to spy on jestjest js how to mock member functionjest how to mock a method of a classcreate a mock function jestjest mockiinghow o mocka class in jestjest mock datajest mock constructorjest mock class function examplejest importmock mockclassjest how to mock a class memberjest mock new classjest mock function tutorialjest spy class methodhow to spy on function jestspy on this jestmock a class in jestas jest mock in javascriptmock jest es6spyon mock class jestmock class method jestjest mockjest mock importmock require jestjest mock examplejest spyon method without objectjest spy on constructorjest fake type of classusing jest mock a full classjest mock resultconstructor mock jsjest class spy on private methodmock const jestjest spy on constructor and methodsjest mock funcitonjest mock bcryptjest mock methods in classmock class constructor jestmock class call jestspy on a function jestmock jest importmock function import jestspy on jest class methodspy on function jestjest how to mock a constjest auto mockjest spyjest mocksmock class jestcreate mock from classs jestmocks jestmock class property jestjest mock packagejest mock 28 29jest mock an objectjest spy functionjest example mock class typescrip 5etjest spyon classunit testint class methods jestmock component jestjest mock class funcimock an object jestjest mock component with jest spyonimport jest mockjest mock a class examplejest spy instancejest mock data examplemock object function jestjest mock local classspy on function in function jestjest mock class methodsjest spy snapshotjest mock in it jest mock class property valuejest mock nameusing jest spyonjest fn mockmock jest examplerun mock jestjest mock method of classmock function jestjest mock class method require nodejest spy on a class methodjest spy on inner functionjest mock document mock a method in jestcreate jest spylearn mock jestjest global mocksjest mock check calledjest function spyspy example jestjest how to mock this es6 classmock class function jestjest mock object methodtesting a class in jestmock class methods jestjest mock examplesjest mock class static methodjest spy instancefunction mock constructor jestmake mock object jestclass component mock function jestjest spy on methodjest mock global classjest mock typejest to mock a classmock es6 class jestjest spyon on functionjest spyon class methodmocking new instance jesthow to mock import in jestjest spyonpropertyspyon method jestjest mocksjest spy within describemock method implementation jestjest mock componentjest mock a class filemock es6 module jestjest spyon methodsjest class method with parameterjest spyon classjest spyon mock return value for creating new object and constructorjest spy method to be calledmock class instance function jestjest spyon on a function in a modulejest mock modulehow to mock functions in jestjest mock imported functionjest spyon object classjest mock examplejest spy on method of class to be calledjest mock class react componentmock a whole module jestjest mock class and methodsjest mock class validatorjest mock class commonjsjest mock class propertyjest spy onjest mock class with constructorjest mocke a classspy on class component method jesthow to mock a class function in jestunit test for class in jestmock classes jestjest mock calljest mockmjest mock importsmocks with jestjest mocking an objectjest spy on class constructorjest mock originaljest mock whole class and its methodjest mock object instancefunction mockconstructor jesthow to use jest spyon to mock function in js calssmock jest functionjest mock es6 functionsjest mock objectes6 class mock constspy methods inside constructor jestjest spy on variablenodejs jest testing classjest spy on class methodsjest mock sharpjest mock es6 classmock interface jestjest auto mock modulejest mock exmaplesjest spyon methodjest mock requirejest constructor importhow to write jest spyon on an objectmock jest objectjest spy on method of instance of classmock class method in jestmock one method in class jestspy on a method in jestmocking function in object jestjest mock specific methods of classhow to mock a get jestjest when should we mock a classmanual mock jestdifferent mocks jestjest mockstorejest import mockjest testing nodejs classeshow to mock an object jestjest mock package with class instantiationmock function of a module jestjest mock constructotrmock method from class jesthow to write test cases for a class with jest jsmock a function of class jestjest spyon method of object classjest spy on called withmock object in jestjest spy on function inside functionjest creating a class mock objectjest mock an imported classjest class methodjest basics mockjest es6 test variablesfunction jest mockjest mock module class functionjest spy on new class jestjest mock class functionmock class new function jestclasses javascript and jestimport jest fnmock a class jest jsjest spyon how unspymock result jestjest create mocksjest mock globalmock all class methods with jestjest mock default classjest spy on examplejest mock style jsjest test function calls in constructorjest 2bmock examplejest spyjest unit test a classjest mock functions of classjest mocks returnspy a funciton jestjest mock import function jsjest mock class add methodjest mock class return valuejest mock class modulejest expect to be a mockconstructor functionmock functions jestjest mocked class 3cjest expect constructor to be calledhow to mock a class in jest and test its methodspy in the jestjest mock s6classjest spy on mathjest mock ckassmock with jestmockconstructor jestjest mock functionjest mock stylemock class import jestjest mocks cssjest mock calledjest mock imported classjest mock a classjest spy on objectmock function jest tutorialjest manual mocksjest how to spy an instance methodjest mock valuesjest class method mockhow to spy in jestjest spy expectedtohavebeencalledjest mock testshow to mock function in jesthow to mock the class object in jestjest mock instancespyon jestmock instance of class jesthow to mock class methods jestjest spyon react componentjest spy method calledjest with mockspy on instance method jestjest mock a model classjest mock componentinject mock jestjest spyon on an objecthow mock components jestjest spyon class instance methoduse object in jest mockjest testing a classspy jest functionjest spyon funcctionjest mock propertyjest fn implementation example with classjest mock const class property jest mocksjest spyon on a classjest mock all methods of classhow to add a mock class with jesthow jest mock workwhat does spyon do in jesthow to spy on a function in jestspy function jestjest spyon functionmock another class jestmock other class jestmock function of a class in jestdoes jest spy on call methodhow to mock a class in jestjest spy on functionhow to mock an object in jestmock jestjest mock class instance methodjest mocking constructorsmock jest componentcreate spy function jestmock testing with jestjest called with spy on calljest mock whenjest spyonsypon mock class implementation jestjest mock class funcitonjest spy on function and return valuejest class mockupjest spy implementationjest class mocksmock class in jestjest spy on component methodsjest mock class new instancecreate mock function jesthow to jest mock a class with methodsjest how to spy on functionjavascript how to test class functionsjest spy on funtionmock jest es6 classjest mock without jestjest mock es6 class getjest tests mock functionsjest mock cllassjest spyon function without objectjest mock explainedmock a class jesttest js class with jestjest class mockjest spy mock methodjest spy on method calljest mock constructor and methodsjest mock es6 jest constructorhow to mock classes in jestmock function spyon jestjest spyon explainedjest class testjest mock best practicesjest mock class instance with constructorjest mockedclass instant offjest use mock for some testsjest mock a class methodjest spy on propertyjest spy class constructorjest webpack mockjest spyon return valuejest test js classclass function call in jestwhat is spyon in jestjest spy using class methodtest classes with jestjest mock use objects functionjest mock 28 27mock implementation jest examplejest mock constructirhow to mock data in jestspy on jestjest mock objecjest mock objecthow to mock with jestjest mock objectsspy on class constructor jestmocking import jestjest test if a hof was calledmock import jestmock instance jestmock object jestjest mockjest mock a functionjest check if class constructor calledwhen use jest spyontest a class jestjest spy on calss functionjest spyon a functionjest mock 28 27 27 29jest mock class typescriptsinon spy on class methodjest mock methodjest where to place mocksjest mock elementjest mock classjest mock function within a classimporting class jest jest mock all method on objectjest create spy functionjest how to spy an instance inside methodjest spy on object propertyes5 class mocksjest spy on function without objectjest mock includeexample of mock function in jestjest spy on function calljest mock class constructorjest how to mock class constructorjest mock elemntmock implementation jesthow to use jest to test js classjest mock constructor classjest spyon functionmock property of class jsjest mock and instancemock service jestjest mock 28 22 22 29jest mock interfacejest testing es6 classjest mock the documentjest mock classmock method jestjest spy on class method