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---
id: 587d824b367417b2b2512c49
title: Test for Truthiness
challengeType: 2
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forumTopicId: 301596
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dashedName: test-for-truthiness
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---
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# --description--
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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/ ).
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`isTrue()` will test for the boolean value `true` and `isNotTrue()` will pass when given anything but the boolean value of `true` .
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```js
assert.isTrue(true, 'this will pass with the boolean value true');
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assert.isTrue('true', 'this will NOT pass with the string value "true"');
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assert.isTrue(1, 'this will NOT pass with the number value 1');
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```
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`isFalse()` and `isNotFalse()` also exist, and behave similarly to their true counterparts except they look for the boolean value of `false` .
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# --instructions--
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Within `tests/1_unit-tests.js` under the test labelled `#4` in the `Basic Assertions` suite, change each `assert` to either `assert.isTrue` or `assert.isNotTrue` to make the test pass (should evaluate to `true` ). Do not alter the arguments passed to the asserts.
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# --hints--
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All tests should pass.
```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=3').then(
(data) => {
assert.equal(data.state, 'passed');
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
```
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You should choose the correct method for the first assertion - `isTrue` vs. `isNotTrue` .
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=3').then(
(data) => {
assert.equal(data.assertions[0].method, 'isTrue', 'True is true');
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
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```
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You should choose the correct method for the second assertion - `isTrue` vs. `isNotTrue` .
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=3').then(
(data) => {
assert.equal(
data.assertions[1].method,
'isTrue',
'Double negation of a truthy value is true'
);
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
```
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You should choose the correct method for the third assertion - `isTrue` vs. `isNotTrue` .
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```js
(getUserInput) =>
$.get(getUserInput('url') + '/_api/get-tests?type=unit& n=3').then(
(data) => {
assert.equal(
data.assertions[2].method,
'isNotTrue',
'A truthy object is not true - neither is a false one'
);
},
(xhr) => {
throw new Error(xhr.responseText);
}
);
```
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# --solutions--
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```js
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/**
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.
*/
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```