--- id: 587d824e367417b2b2512c57 title: Test if an Object is an Instance of a Constructor challengeType: 2 forumTopicId: 301605 --- # --description-- As a reminder, this project is being built upon the following starter project on [Repl.it](https://repl.it/github/freeCodeCamp/boilerplate-mochachai), or cloned from [GitHub](https://github.com/freeCodeCamp/boilerplate-mochachai/). `#instanceOf` asserts that an object is an instance of a constructor. # --instructions-- Within `tests/1_unit-tests.js` under the test labelled `#18` in the `Objects` suite, change each `assert` to either `assert.instanceOf` or `assert.notInstanceOf` to make the test pass (should evaluate to `true`). Do not alter the arguments passed to the asserts. # --hints-- All tests should pass. ```js (getUserInput) => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then( (data) => { assert.equal(data.state, 'passed'); }, (xhr) => { throw new Error(xhr.responseText); } ); ``` You should choose the correct method for the first assertion - `instanceOf` vs. `notInstanceOf`. ```js (getUserInput) => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then( (data) => { assert.equal( data.assertions[0].method, 'notInstanceOf', 'myCar is not an instance of Plane' ); }, (xhr) => { throw new Error(xhr.responseText); } ); ``` You should choose the correct method for the second assertion - `instanceOf` vs. `notInstanceOf`. ```js (getUserInput) => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then( (data) => { assert.equal( data.assertions[1].method, 'instanceOf', 'airlinePlane is an instance of Plane' ); }, (xhr) => { throw new Error(xhr.responseText); } ); ``` You should choose the correct method for the third assertion - `instanceOf` vs. `notInstanceOf`. ```js (getUserInput) => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then( (data) => { assert.equal( data.assertions[2].method, 'instanceOf', 'everything is an Object in JavaScript...' ); }, (xhr) => { throw new Error(xhr.responseText); } ); ``` You should choose the correct method for the fourth assertion - `instanceOf` vs. `notInstanceOf`. ```js (getUserInput) => $.get(getUserInput('url') + '/_api/get-tests?type=unit&n=17').then( (data) => { assert.equal( data.assertions[3].method, 'notInstanceOf', 'myCar.wheels is not an instance of String' ); }, (xhr) => { throw new Error(xhr.responseText); } ); ``` # --seed-- # --solutions-- ```js /** Backend challenges don't need solutions, because they would need to be tested against a full working project. Please check our contributing guidelines to learn more. */ ```