Mocking up static methods in jest
12
I am having trouble mocking up a static method in jest. Immagine you have a class A with a static method:
export default class A {
f() {
return 'a.f()'
}
static staticF () {
return 'A.staticF()'
}
}
And a class B that imports A
import A from './a'
export default class B {
g() {
const a = new A()
return a.f()
}
gCallsStaticF() {
return A.staticF()
}
}
Now you want to mock up A. It is easy to mock up f():
import A from '../src/a'
import B from '../src/b'
jest.mock('../src/a', () => {
return jest.fn().mockImplementation(() => {
return { f: () => { return 'mockedA.f()'} }
})
})
describe('Wallet', () => {
it('should work', () => {
const b = new B()
const result = b.g()
console.log(result) // prints 'mockedA.f()'
})
})
However, I could not fund any documentation on how to mock up A.staticF. Is this possible?
javascript jestjs
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
add a comment |
12
I am having trouble mocking up a static method in jest. Immagine you have a class A with a static method:
export default class A {
f() {
return 'a.f()'
}
static staticF () {
return 'A.staticF()'
}
}
And a class B that imports A
import A from './a'
export default class B {
g() {
const a = new A()
return a.f()
}
gCallsStaticF() {
return A.staticF()
}
}
Now you want to mock up A. It is easy to mock up f():
import A from '../src/a'
import B from '../src/b'
jest.mock('../src/a', () => {
return jest.fn().mockImplementation(() => {
return { f: () => { return 'mockedA.f()'} }
})
})
describe('Wallet', () => {
it('should work', () => {
const b = new B()
const result = b.g()
console.log(result) // prints 'mockedA.f()'
})
})
However, I could not fund any documentation on how to mock up A.staticF. Is this possible?
javascript jestjs
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
add a comment |
12
12
12
1
I am having trouble mocking up a static method in jest. Immagine you have a class A with a static method:
export default class A {
f() {
return 'a.f()'
}
static staticF () {
return 'A.staticF()'
}
}
And a class B that imports A
import A from './a'
export default class B {
g() {
const a = new A()
return a.f()
}
gCallsStaticF() {
return A.staticF()
}
}
Now you want to mock up A. It is easy to mock up f():
import A from '../src/a'
import B from '../src/b'
jest.mock('../src/a', () => {
return jest.fn().mockImplementation(() => {
return { f: () => { return 'mockedA.f()'} }
})
})
describe('Wallet', () => {
it('should work', () => {
const b = new B()
const result = b.g()
console.log(result) // prints 'mockedA.f()'
})
})
However, I could not fund any documentation on how to mock up A.staticF. Is this possible?
javascript jestjs
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
I am having trouble mocking up a static method in jest. Immagine you have a class A with a static method:
export default class A {
f() {
return 'a.f()'
}
static staticF () {
return 'A.staticF()'
}
}
And a class B that imports A
import A from './a'
export default class B {
g() {
const a = new A()
return a.f()
}
gCallsStaticF() {
return A.staticF()
}
}
Now you want to mock up A. It is easy to mock up f():
import A from '../src/a'
import B from '../src/b'
jest.mock('../src/a', () => {
return jest.fn().mockImplementation(() => {
return { f: () => { return 'mockedA.f()'} }
})
})
describe('Wallet', () => {
it('should work', () => {
const b = new B()
const result = b.g()
console.log(result) // prints 'mockedA.f()'
})
})
However, I could not fund any documentation on how to mock up A.staticF. Is this possible?
javascript jestjs
javascript jestjs
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
edited Sep 15 '18 at 23:02
Thiago Murakami
51329
51329
asked May 19 '18 at 4:21
ClemensClemens
11018
asked May 19 '18 at 4:21
ClemensClemens
11018
asked May 19 '18 at 4:21
ClemensClemens
11018
11018
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
10
One option is to use bind.
import A from '../src/a';
import B from '../src/b';
jest.mock('../src/a');
describe('Wallet', () => {
it('should work', () => {
const mockStaticF = jest.fn();
mockStaticF.mockReturnValue('worked');
A.staticF = mockStaticF.bind(A);
const b = new B();
const result = b.gCallsStaticF();
expect(result).toEqual('worked');
});
});
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
add a comment |
1
I managed to mock it in a separate file in the __mocks__ folder using prototyping. So you would do:
function A() {}
A.prototype.f = function() {
return 'a.f()';
};
A.staticF = function() {
return 'A.staticF()';
};
export default A;
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
10
One option is to use bind.
import A from '../src/a';
import B from '../src/b';
jest.mock('../src/a');
describe('Wallet', () => {
it('should work', () => {
const mockStaticF = jest.fn();
mockStaticF.mockReturnValue('worked');
A.staticF = mockStaticF.bind(A);
const b = new B();
const result = b.gCallsStaticF();
expect(result).toEqual('worked');
});
});
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
add a comment |
10
One option is to use bind.
import A from '../src/a';
import B from '../src/b';
jest.mock('../src/a');
describe('Wallet', () => {
it('should work', () => {
const mockStaticF = jest.fn();
mockStaticF.mockReturnValue('worked');
A.staticF = mockStaticF.bind(A);
const b = new B();
const result = b.gCallsStaticF();
expect(result).toEqual('worked');
});
});
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
add a comment |
10
10
10
One option is to use bind.
import A from '../src/a';
import B from '../src/b';
jest.mock('../src/a');
describe('Wallet', () => {
it('should work', () => {
const mockStaticF = jest.fn();
mockStaticF.mockReturnValue('worked');
A.staticF = mockStaticF.bind(A);
const b = new B();
const result = b.gCallsStaticF();
expect(result).toEqual('worked');
});
});
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
One option is to use bind.
import A from '../src/a';
import B from '../src/b';
jest.mock('../src/a');
describe('Wallet', () => {
it('should work', () => {
const mockStaticF = jest.fn();
mockStaticF.mockReturnValue('worked');
A.staticF = mockStaticF.bind(A);
const b = new B();
const result = b.gCallsStaticF();
expect(result).toEqual('worked');
});
});
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
answered Sep 14 '18 at 14:36
Peter StonhamPeter Stonham
11635
11635
add a comment |
add a comment |
1
I managed to mock it in a separate file in the __mocks__ folder using prototyping. So you would do:
function A() {}
A.prototype.f = function() {
return 'a.f()';
};
A.staticF = function() {
return 'A.staticF()';
};
export default A;
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
add a comment |
1
I managed to mock it in a separate file in the __mocks__ folder using prototyping. So you would do:
function A() {}
A.prototype.f = function() {
return 'a.f()';
};
A.staticF = function() {
return 'A.staticF()';
};
export default A;
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
add a comment |
1
1
1
I managed to mock it in a separate file in the __mocks__ folder using prototyping. So you would do:
function A() {}
A.prototype.f = function() {
return 'a.f()';
};
A.staticF = function() {
return 'A.staticF()';
};
export default A;
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
I managed to mock it in a separate file in the __mocks__ folder using prototyping. So you would do:
function A() {}
A.prototype.f = function() {
return 'a.f()';
};
A.staticF = function() {
return 'A.staticF()';
};
export default A;
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
answered Nov 16 '18 at 8:25
mandarinmandarin
5451619
5451619
add a comment |
add a comment |
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