My JavaScript/TypeScript class (AAA) extends another class (BBB). The API of class BBB is stable, but the implementation is not yet finalized. I just want to unit test some functions in class AAA. However, I'm facing an issue in creating an instance of class AAA due to the constructor call of class BBB. You can find an example here:
BBB.ts:
class BBB {
constructor() {
throw new Error("BBB");
}
public say(msg: string): string {
return msg;
}
}
module.exports = BBB;
AAA.ts:
const BB = require("./BBB");
class AAA
extends BB {
public hello(): string {
return super.say("Hello!");
}
}
module.exports = AAA;
Test Script:
const AA = require("../src/AAA");
import sinon from "sinon";
describe("Hello Sinon", () => {
describe("#hello", () => {
it("#hello", async () => {
const stub = sinon.stub().callsFake(() => { });
Object.setPrototypeOf(AA, stub);
let a = new AA();
sinon.spy(a, "hello");
a.hello();
sinon.assert.calledOnce(a.hello);
sinon.assert.calledOnce(stub);
// how to verify that super.say has been called once with string "Hello!"?
});
});
});
I'm using sinonjs. However, I'm struggling to create an instance of AAA in this case. If I can create one, I'm unsure how to verify the call to super.say.
Thank you!
UPDATE: I have managed to create an instance of AAA now, but I need guidance on how to verify the call to super.say.