How to test sequelize query (where) logic? - node.js

Question

I'm trying to write unit tests which will test if the search query is right In other words if the logic written in where statement is returning expected results.
async function search(some_data){
return Event.findOne({
where: {
id: 123435,
[Op.or]: [
days: {
[Op.overlap]: some_data.days,
},
[Op.or]: [
{
startTime: {
[Op.gt]: some_data.start1,
},
endTime: {
[Op.lt]:some_data.end1,
},
},
{
startTime: {
[Op.lt]: some_data.start2,
[Op.lt]: some_data.end2,
},
endTime: {
[Op.gt]: some_data.end2,
[Op.gt]: some_data.start2,
},
},
],
],
},
})};
I need to test the result for different inputs.
I don't want to convert this test into integration test and use the original db, so I used sequelize-mock lib, but this returns only the result that I've defined and does not run the real query.

Answer 1

To test that your method is called with the correct parameters, you will need to use dependency injetion and a library to "spy" on your findOne method. In the example below, I am using Sinon
// app.js
// Note that "Event" must be used an argument in order to mock it out
async function search(Event, some_data) {
return Event.findOne({
where: {
id: 123435
}
})
}
If your test file:
// your test file
const app = require('./app');
const sinon = require('sinon');
const EventMock = {
findOne: sinon.spy()
};
describe('search', () => {
it('should call with the right parameters', () => {
const some_data = {};
search(EventMock, some_data);
assert(EventMock.findOne.calledWith({
where: {
id: 123435
}
}))
});
});