CODEWITHSUNDEEP
angularunit-testingjestjs
Christina Varghese
Christina Varghese

Reputation: 179

Unit test for array with .find method in angular using jest

How to get coverage for array with .find method in angular. I'm getting trouble in the below piece of code.

sample.component.ts

public permissions = [{id: 0, value: 'fruit' }, {id: 1, value: 'vegetable'}];
this.filteredList = this.permissions.slice();
public isFiltered(permission) {
    return this.filteredList.find(item => item.id === permission.id);
}

sample.spec.ts

it('should call myMethod ', () => {
  expect(component.isFiltered(1)).toEqual(true);
});

I'm getting the following error , TypeError: Cannot read property 'find' of undefined

Any help would be appreciated

Upvotes: 1

Views: 3622

Answers (1)

Shlok Nangia
Shlok Nangia

Reputation: 2377

write it like this

 it('should call myMethod ', () => {
   let permissions = [{id: 0, value: 'fruit' },{id: 1, value: 'vegetable'} ];
   component.filteredList = permissions.slice();
   expect(component.isFiltered({id:1}).value).toEqual('vegetable');
 });

You need to give some value to component.filteredList

UPDATE

as you are using persmissions.id in your ts to filter you need to pass an object with property id(to filter by) to isFiltered(). Also isFiltered does not returns a boolean but the object (i.e. search result itself) so we check its value to be the required one

Upvotes: 1

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