sinon stub first api call and spy second api call

I have a method like this

fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );

I am stubbing the first fetch call like

const stub = sinon.stub(window, 'fetch');

Now to test success call

stub.withArgs('first api').returns(Promise.resolve(//window.Response));

or failure

stub.withArgs('first api').returns(Promise.reject(//window.Response));

Have two questions:

How can I spy that in case of first api error scenario, second fetch api is not called?

How can I stub both fetch calls and test that last then is called when both fetch calls is resolved?

Thanks.

asked Nov 10 at 2:12

parsh

406820

add a comment |

I have a method like this

fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );

I am stubbing the first fetch call like

const stub = sinon.stub(window, 'fetch');

Now to test success call

stub.withArgs('first api').returns(Promise.resolve(//window.Response));

or failure

stub.withArgs('first api').returns(Promise.reject(//window.Response));

Have two questions:

How can I spy that in case of first api error scenario, second fetch api is not called?

How can I stub both fetch calls and test that last then is called when both fetch calls is resolved?

Thanks.

asked Nov 10 at 2:12

parsh

406820

add a comment |

I have a method like this

fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );

I am stubbing the first fetch call like

const stub = sinon.stub(window, 'fetch');

Now to test success call

stub.withArgs('first api').returns(Promise.resolve(//window.Response));

or failure

stub.withArgs('first api').returns(Promise.reject(//window.Response));

Have two questions:

How can I spy that in case of first api error scenario, second fetch api is not called?

How can I stub both fetch calls and test that last then is called when both fetch calls is resolved?

Thanks.

asked Nov 10 at 2:12

parsh

406820

I have a method like this

fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );

I am stubbing the first fetch call like

const stub = sinon.stub(window, 'fetch');

Now to test success call

stub.withArgs('first api').returns(Promise.resolve(//window.Response));

or failure

stub.withArgs('first api').returns(Promise.reject(//window.Response));

Have two questions:

How can I spy that in case of first api error scenario, second fetch api is not called?

How can I stub both fetch calls and test that last then is called when both fetch calls is resolved?

Thanks.

javascript fetch sinon

asked Nov 10 at 2:12

parsh

406820

asked Nov 10 at 2:12

parsh

406820

asked Nov 10 at 2:12

parsh

406820

asked Nov 10 at 2:12

parsh

406820

asked Nov 10 at 2:12

parsh

406820

add a comment |

1 Answer
1

active

oldest

votes

You can use the spy api on stubs. So if you make a stub of fetch you can use all the tools such as onFirstCall().resolves('some value') to return a promise as well as the spy properties like calledTwice.

For example to return two different promises and test that fetch was called twice you can:

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

To test for rejected promises use stub.rejects('some values')

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

Thanks. It worked.
– parsh
Nov 10 at 18:41

add a comment |

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For example to return two different promises and test that fetch was called twice you can:

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

To test for rejected promises use stub.rejects('some values')

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

Thanks. It worked.
– parsh
Nov 10 at 18:41

add a comment |

For example to return two different promises and test that fetch was called twice you can:

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

To test for rejected promises use stub.rejects('some values')

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

Thanks. It worked.
– parsh
Nov 10 at 18:41

add a comment |

For example to return two different promises and test that fetch was called twice you can:

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

To test for rejected promises use stub.rejects('some values')

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

For example to return two different promises and test that fetch was called twice you can:

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

To test for rejected promises use stub.rejects('some values')

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

function run()
 return fetch('first api')
 .then(resp => 
 if (resp.status === '500') 
 return Promise.reject('some error');
 
 return fetch('second api');
 )
 .then(resp => 
 // do something;
 )
 .catch(resp => 
 // do something;
 );


let stub = sinon.stub(window, 'fetch')
stub.onFirstCall().resolves("testing first")
stub.onSecondCall().resolves("testing second")

run().then(()=> console.log("called twice: ", stub.calledTwice))

<script src="https://cdnjs.cloudflare.com/ajax/libs/sinon.js/7.1.1/sinon.min.js"></script>

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

answered Nov 10 at 2:46

Mark Meyer

35.1k32855

Thanks. It worked.
– parsh
Nov 10 at 18:41

add a comment |

Thanks. It worked.
– parsh
Nov 10 at 18:41

Thanks. It worked.
– parsh
Nov 10 at 18:41

add a comment |

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