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How to use the assert function from chai

Find comprehensive JavaScript chai.assert code examples handpicked from public code repositorys.

chai.assert is a method from the Chai assertion library that allows you to write assertions that test if an expression is true or not.

platform.js

GitHub: lprhodes/homebridge-broadlink-rm

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hosts.forEach((host) => {
  assert.isObject(host, `\x1b[31m[CONFIG ERROR] \x1b[0m Each item in the \x1b[33mhosts\x1b[0m array should be an object.`)
  
  const { address, isRFSupported, mac } = host;
  assert(address, `\x1b[31m[CONFIG ERROR] \x1b[0m Each object in the \x1b[33mhosts\x1b[0m option should contain a value for \x1b[33maddress\x1b[0m (e.g. "192.168.1.23").`)
  assert(mac, `\x1b[31m[CONFIG ERROR] \x1b[0m Each object in the \x1b[33mhosts\x1b[0m option should contain a unique value for \x1b[33mmac\x1b[0m (e.g. "34:ea:34:e7:d7:28").`)

  const deviceType = isRFSupported ? 0x279d : 0x2712;

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+ 23 other calls in file

IncomingWebhook.spec.js

GitHub: slackapi/node-slack-sdk

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const spy = sinon.spy(agent, 'addRequest');
const webhook = new IncomingWebhook(url, { agent });

return webhook.send('Hello')
  .catch(() => {
    assert(spy.called);
  })
  .then(() => {
    agent.addRequest.restore();
    agent.destroy();

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How does chai.assert work?

chai.assert is a method used in Chai, a JavaScript assertion library, to test and verify the truthiness of a value or expression. It throws an error if the assertion fails, which can be caught and handled by the user.

1_unit-tests.js

GitHub: kikeEsponja/QA-cert

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+ 3 other calls in file

final-solution.js

GitHub: mcthp/html5-practical

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+ 2 other calls in file

Ai Example

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const chai = require("chai");

chai.assert.equal(2 + 2, 4); // passes
chai.assert.equal(2 + 2, 5); // throws AssertionError

test-challenges.js

GitHub: erdvis/coadeacadami

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        break;
      }
    }
  }
  console.error = oldConsoleError;
  assert(fails, 'Test suit does not fail on the initial contents');
});

let { solutions = [] } = challenge;

+ 3 other calls in file

reminderHandler.test.js

GitHub: RationalityEnhancement/ReflectiveLearningChatbots

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    expect(Object.keys(scheduler.scheduledJobs).filter(jobId => jobId.includes("_r_")).length).to.equal(0);
    participant = await participants.get(testId)
    participant.firstName = "John";
    returnObj = await ReminderHandler.setReminder(testConfig, testBot, participant, "12345", 15, 0);
    expect(returnObj.returnCode).to.equal(DevConfig.SUCCESS_CODE);
    assert(Array.isArray(returnObj.data))
    expect(returnObj.data.length).to.equal(0);
})
it('Should return success and list of jobs', async () => {
    participant = await participants.get(testId);

+ 91 other calls in file

actionHandler.test.js

GitHub: RationalityEnhancement/ReflectiveLearningChatbots

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    await participants.initializeParticipant(testPartId, config, bot.telegram.token)
    let participant = await participants.get(testPartId);
    expect(participant).to.not.be.null;
    expect(participant.uniqueId).to.equal(testPartId);
    expect(participant.parameters.language).to.equal("English");
    assert("parameterTypes" in participant);

});
it('Should add and update experiment', async () => {

+ 99 other calls in file

scheduleHandler.test.js

GitHub: RationalityEnhancement/ReflectiveLearningChatbots

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    expect(sortedQs[2].qId).to.equal("test1")
    expect(sortedQs[3].qId).to.equal("test4")
})
it('Should return empty when not array', () => {
    let sortedQs = ScheduleHandler.sortQInfoByTime("lol");
    assert(Array.isArray(sortedQs));
    expect(sortedQs.length).to.equal(0)
})
it('Should return empty when array empty', () => {
    let sortedQs = ScheduleHandler.sortQInfoByTime([]);

+ 627 other calls in file

stageHandler.test.js

GitHub: RationalityEnhancement/ReflectiveLearningChatbots

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expect(participant).to.not.be.null;
expect(participant.uniqueId).to.equal(testPartId);
expect(participant.parameters.language).to.equal("English");
assert("parameterTypes" in participant);
assert("stages" in participant);
assert("activity" in participant.stages);
assert("stageName" in participant.stages);
assert("stageDay" in participant.stages);

+ 39 other calls in file

utest.js

GitHub: davidcorne/number-fit

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dawn-deposit.test.js

GitHub: okx-dao/dawnpool

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      // stake 1
      await dawnDeposit.stake({ from: owner.address, value: 1 });
      await chai.assert.equal(await dawnDeposit.balanceOf(owner.address), 1);


      // await web3js.eth.sendTransaction({ to: dawnDeposit.address, from: owner.address, value: 1 })
      // await chai.assert.equal(await dawnDeposit.balanceOf(owner.address), 2)
    });
  });
});

+ 3 other calls in file

mocha.conf.js

GitHub: angular-fullstack/generator-angular-fullstack

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const chai = require('chai');

// Load Chai assertions
global.expect = chai.expect;
global.assert = chai.assert;
chai.should();

// Load Sinon
global.sinon = require('sinon');

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+ 15 other calls in file

Other functions in chai

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