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Learn How JavaScript Assertions Work

curriculum/challenges/english/blocks/quality-assurance-and-testing-with-chai/587d824a367417b2b2512c46.md

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--description--

Working on these challenges will involve you writing your code using one of the following methods:

  • Clone <a href="https://github.com/freeCodeCamp/boilerplate-mochachai/" target="_blank" rel="noopener noreferrer nofollow">this GitHub repo</a> and complete these challenges locally.
  • Use a site builder of your choice to complete the project. Be sure to incorporate all the files from our GitHub repo.

--instructions--

Within tests/1_unit-tests.js under the test labeled #1 in the Basic Assertions suite, change each assert to either assert.isNull or assert.isNotNull to make the test pass (should evaluate to true). Do not alter the arguments passed to the asserts.

--hints--

All tests should pass.

js
  const response = await fetch(code + '/_api/get-tests?type=unit&n=0');
  if (!response.ok) {
    throw new Error(await response.text());
  }
  const data = await response.json();
  assert.equal(data.state, 'passed');

You should choose the correct method for the first assertion - isNull vs. isNotNull.

js
  const response = await fetch(code + '/_api/get-tests?type=unit&n=0');
  if (!response.ok) {
    throw new Error(await response.text());
  }
  const data = await response.json();
  assert.equal(data.assertions[0].method, 'isNull', 'Null is null');

You should choose the correct method for the second assertion - isNull vs. isNotNull.

js
  const response = await fetch(code + '/_api/get-tests?type=unit&n=0');
  if (!response.ok) {
    throw new Error(await response.text());
  }
  const data = await response.json();
  assert.equal(data.assertions[1].method, 'isNotNull', '1 is not null');