I have a method inside a class calculating the sum of 2 parameters that returns a Promise (a must):
module.exports = class Sum {
sum(a, b) {
let c = a + b;
const myPromise = new Promise(function(myResolve) {
setTimeout(function(){ myResolve(c); }, 100);
});
return myPromise;
}
}
I use Jasmine framework to unit-test
const MyLocalVariable1 = require('../src/sum');
describe('CommonJS modules', () => {
it('should import whole module using module.exports = sum;', async () => {
const result = new MyLocalVariable1();
expect(result.sum(4, 5).then(function(value) {
return value;
})).toBe(9);
});
}
The first expression is what we want to test:
result.sum(4, 5).then(function(value) {
return value;
})
and the second one is the expected value:
toBe(9)
But how can I get a value from the first expression, because it's a Promise, and expected value of it is [object Promise]. Thanks in advance
To drive Konrad's point home, you can do the following:
it('should import whole module using module.exports = sum;', async () => {
const result = new MyLocalVariable1();
const answer = await result.sum(4, 5);
expect(answer).toBe(9);
});
Or the following:
// add done callback to tell Jasmine when you're done with the unit test
it('should import whole module using module.exports = sum;', (done) => {
const result = new MyLocalVariable1();
result.sum(4, 5).then(answer => {
expect(answer).toBe(9);
done();
});
});