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How to mock chained promises using Jasmine?


How to mock chained promises using Jasmine?

By : Penny Wright
Date : November 22 2020, 03:01 PM
hop of those help? I am writing a unit test to a method that contains this piece of code: , Your (partial) controller code
code :
$scope.list = [];

function addNameToList(name) {
  $scope.list.push(name);
}

function doSomething(name){
  addNametoList(name);
}

$scope.functionToTest = function() {
  Name.get($scope.nameId).then(function(name){
    return name;
  }).then(doSomething);
};
it('should add the name to the list when Name.get() is resolved', function() {
  // Arrange
  var getDeferred = $q.defer();
  spyOn(mockName, 'get').and.returnValue(getDeferred.promise);

  // Act
  $scope.functionToTest();
  getDeferred.resolve('some name that should be in the list');
  $scope.$apply();

  // Assert
  expect($scope.list).toEqual(['some name that should be in the list']);
});
.then(function(name){
  return name;
})


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Jasmine mock chained methods with Karma and Angular

Jasmine mock chained methods with Karma and Angular


By : Mia yun Ruse
Date : March 29 2020, 07:55 AM
Any of those help The way chained methods should be spied or mocked solely depends on how they are defined on the spied objects.
In the case of Angular jqLite, or in your case, jQuery (both are transparently served through angular.element facade) chained methods are defined on constructor prototype, which is exposed on factory function as angular.element.prototype or jQuery.prototype (angular.element === jQuery when jQuery is loaded).
code :
spyOn(angular, 'element').and.callThrough();
spyOn(angular.element.prototype, 'attr').and.callThrough();
...
expect(angular.element).toHaveBeenCalled();
expect(angular.element.prototype.attr).toHaveBeenCalled();
in chained promises, if first promise require to not to execute rest of the promises, how

in chained promises, if first promise require to not to execute rest of the promises, how


By : Plamen Politov
Date : March 29 2020, 07:55 AM
I hope this helps . In general, there are multiple ways to solve this problem.
One of them is by:
code :
// This can be anything, as long as it's "unique"
var dummyError = "has no data";

function checkMongoForData(req, res) {
    return new Promise(function (resolve, reject) {
        // TODO: Replace with your logic
        var hasData = false;
        var data = "";

        if (hasData) {
            resolve(data);
        } else {
            reject(dummyError);
        }
    });
}

checkMongoForData(req, res)
    .then(function (result) {
        return makeTheSOAPcall(req, res, result)
    })
    .then(function (result) {
        return fillTheReasonDescriptions(req, res, result);
    })
    .then(function (result) {
        return upsertTheRespDocInMongo(req, res, result);
    })
    .catch(function (error) {
        if (error === dummyError) {
            return;
        }

        // This line "re-throws"/"re-rejects" the error object
        return Promise.reject(error);
    })
    .then(function (result) {
        res.status(200);
        res.send({result: 'success', status: 200});
    })
    .catch(function (reject) {
        res.status(reject.status);
        res.send({result: reject.description, status: reject.status});
    });
how to use jasmine clock (setTimeout) in nested promises when order matters? (jasmine.DEFAULT_TIMEOUT_INTERVAL error)

how to use jasmine clock (setTimeout) in nested promises when order matters? (jasmine.DEFAULT_TIMEOUT_INTERVAL error)


By : mazl123321
Date : March 29 2020, 07:55 AM
I hope this helps you . Ok for those who came with same problem:
[UPDATE]: I created a npm package with that fn https://www.npmjs.com/package/promiseloop
code :
function promiseLoop(times,iterationFn,finalFn){
  let current=0;
  let p=Promise.resolve("ok");
  function _loop(fn){
    current++;
    if(current<times){
      p=p.then(()=>{
        iterationFn(current);
        _loop(finalFn);
      });
    }else{
      p.then(()=>{
        setImmediate(()=>{
          finalFn();
        });
      });
    }
  }
  _loop(finalFn);
}
it("should run setTimeout mock inside chained promises",(done)=>{

      jasmine.clock().install();

      let realOrder = [];

      let ok1=new Promise((resolve,reject)=>{
          resolve("ok");
      }).then((ok)=>{ // second level

        let p=new Promise((resolve,reject)=>{
          setTimeout(()=>{ // not fired up due to 'then' method
            realOrder.push("1");
            resolve("1");
          },100);
        });
        //jasmine.clock().tick(101); //<- order is crucial here so I can't do that
        return p;

      });

      let ok2=new Promise((resolve,reject)=>{
          resolve("ok");
      }).then((ok)=>{ // second level

        let p=new Promise((resolve,reject)=>{
          setTimeout(()=>{ // not fired up due to 'then' method
            realOrder.push("2");
            resolve("2");
          },50);
        });
        //jasmine.clock().tick(51); //<- order is crucial here so I can't do that
        return p;

      });

      function iterationTick(){
        jasmine.clock().tick(301); 
        // this will be executed on each promise level in our case second level 
        // that normally would not be catched by 
        // jasmine.clock().tick() because 'then' will be 
        // executed in the future and jasmine.clock().tick() is synchronous 
        // and will not see future setTimeouts
      }

      function finalTick(){
        Promise.all([ok1,ok2]).then((results)=>{
          expect(results).toEqual(["1","2"]);
          expect(realOrder).toEqual(["2","1"]);
          jasmine.clock().uninstall();
          done();
        });
        //jasmine.clock().tick(301);
      }

      promiseLoop(2,iterationTick,finalTick);


  });
let testNr=0;

new Promise((resolve,reject)=>{
  resolve("ok");
}).then(()=>{
  // level 1 
  testNr++; // 1 
}).then(()=>{
  // level 2 
  testNr++; // 3 
});

new Promise((resolve,reject)=>{
  resolve("ok");
}).then(()=>{
  // level 1 
  testNr++; // 2 
}).then(()=>{
  // level 2 
  testNr++; // 4 
});

function each(currentLevel){
  if(currentLevel==1){
    expect(testNr).toEqual(2);
  }else if(currentLevel==2){
    expect(testNr).toEqual(4);
  }
}
function final(){
  expect(testNr).toEqual(4);
  done();
}
promiseLoop(3,each,final);
Angular 6 testing - Jasmine - mock chained promises

Angular 6 testing - Jasmine - mock chained promises


By : user1513827
Date : March 29 2020, 07:55 AM
I wish this helpful for you Your stub is slightly incorrect, the sendEmailVerification() method belongs on the currentUser property.
code :
const afAuthStub = {
  auth: {
    createUserWithEmailAndPassword(): Promise<void> {
      return new Promise<void>(resolve => resolve());
    },
    currentUser: {
      uid: 'blub',
      sendEmailVerification(): Promise<void> {
        return new Promise<void>(resolve => resolve());
      },
    }
  }
};

...

const spy = spyOn(afAuthStub.auth.currentUser, 'sendEmailVerification')
chained promises in nodejs is executing only the first promise but not chained promises

chained promises in nodejs is executing only the first promise but not chained promises


By : r-men
Date : March 29 2020, 07:55 AM
this one helps. I have below code in nodejs. I have two promises chained and then by console message done at the end. , resolve() instead of resolve in the setTimeoutFn
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