Dfyjkt

I'm having trouble with code coverage and can't figure it out. I am using google geocoding API to query coordinates where response is returned inside callback function.
Jest is used for testing.

This is the testable call with callback:

const geocoder = new google.maps.Geocoder();
geocoder.geocode(address: address, (results, status) => 
 // want to get coverage in this block
 // expected test results are OK and logging shows right results
);

This is the test. Because google.maps is not available by default when testing, I found such solution:

it('test', () => 
 const constructorSpy = spyOn(google.maps, 'Geocoder');
 const geocoder = createSpyObj('Geocoder', ['geocode']);
 constructorSpy.and.returnValue(geocoder);
 geocoder.geocode = jest.fn((adr, callback) => callback(response, 'OK'));
 // expected results that are all OK
);

createSpyObj https://stackoverflow.com/a/45319913/1756136:

const createSpyObj = (baseName, methodNames): [key: string]: Mock<any> => 
 let obj: any = ;
 for (let i = 0; i < methodNames.length; i++) 
 obj[methodNames[i]] = jest.fn();
 
 return obj;
;

And google.maps is defined in setupTests.js. When not testing, google.maps is available when react loads google map

window.google = 
 maps: 
 Geocoder: ,
 GeocoderStatus: 
 OK: 'OK'
 
 
;

Any ideas what I could try or look into? Only coverage is the problem, expected results are fine.

Code coverage is actually already working correctly with this implementation. Problem was that I wasn't accessing 'else' statements in 'if' clauses where there was only 'if' clause.

Also it's possible not to spy on, but define as a property and run your test:

it('test', () => 
 Object.defineProperty(google, 'maps', 
 value: 
 Geocoder: function () 
 return 
 geocode: jest.fn((adr, callback) => callback(response, 'OK'))
 
 
 
 );
 // expect..
);