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test.js
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test.js
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const Declare = require("./");
const testValue = "Hanodrim-Rules";
jest.setTimeout(5000);
const projectName = "Declare <constructor>";
describe(projectName, () => {
test("Is not an instance of Promise", () => {
const declare = new Declare(()=>{});
return expect(declare instanceof Promise).toBe(false);
});
test("Can create a new Declare instance", () => {
const declare = new Declare(()=>{});
expect(declare).toBeDefined();
});
test('Should have "then" method which Resolves with a Declare', () => {
const declare = new Declare(()=>{});
expect(typeof declare.then).toBe("function");
return expect(declare.then() instanceof Declare).toBe(true);
});
test('Can use the result of the declare using the "then" method', () => {
const declare = new Declare((resolve) => {
resolve(testValue);
});
return declare.then((result) => {
expect(result).toBe(testValue);
});
});
test("Can chain thens", () => {
const declare = new Declare((resolve) => {
resolve(5);
});
return declare
.then((res) => res + 5)
.then((val) => {
expect(val).toBe(10);
});
});
test("Is asynchronous", (done) => {
let changer = null;
const declare = new Declare((resolve) => { //this declare should resolve with "5" after .5 seconds
setTimeout(() => {
resolve(testValue);
}, 500);
});
setTimeout(() => {// this checks after 1 second that the value of "changer" has changed
expect(changer).toBe(testValue);
done();
}, 1000);
declare.then((value) => {// the promise will ( once it resolves) change "changer" into "5"
changer = value;
});
expect(changer).toBeNull();// this checks that the value of "changer" is stil null after the promise is created.
});
});