Uncaught ReferenceError chai is not defined · Issue 2 · tylercollier
If you're using Chai-As-Promised (as you say you are), then it allows for chaining off of rejectedWith - and it sets the chain assertion object to be the error object - meaning anything after rejectedWith () is now going to assert on the Error. This lets you do cool things like:
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.deep Causes all .equal, .include, .members, .keys, and .property assertions that follow in the chain to use deep equality instead of strict ( ===) equality. See the deep-eql project page for info on the deep equality algorithm: https://github.com/chaijs/deep-eql.
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The Basics Install Chai in node, the browser, and other environments. Learn about styles that you can use to define assertions. Making Plugins After you have a solid knowledge of what is included in Chai, the next step is learning how to extend Chai through plugins.
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Commonly used with Chai, Mocha is an open source JavaScript testing framework that runs on Node.js and in the browser. Advisory boards aren't only for executives.. Whenever a hook is defined outside of a definite describe() block, the hook becomes a root-level hook. Root-level hooks apply to all test files regardless of where they are defined.
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Sinon.JS property/method Assertion; called.should('have.been.called') expect(spy).to.be.called: callCount.should('have.callCount', 3) expect(spy).to.have.callCount(n)
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chai.spy.on() is a method that let's us define what we want to spy on the first argument is the object we want to spy on; the second argument is an array of any methods we want to override with a spy (or a single string if we're only spying on one method); the third argument is an optional replacement for how those methods should behave/what they should do
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Deep Equality. Chai.js solves this problem by providing a second equality assertion, eql.Eql is based on the deep-eql project.It works by looking at the content of the expressions being compared.
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Spy. var spy = sinon.spy(); Creates an anonymous function that records arguments, this value, exceptions and return values for all calls. var spy = sinon.spy(myFunc); Spies on the provided function. var spy = sinon.spy(object, "method"); Creates a spy for object.method and replaces the original method with the spy.
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defined function in Assertion Best JavaScript code snippets using chai. Assertion.defined (Showing top 15 results out of 315) chai ( npm) Assertion defined expect (wrapper.props ().email).to.be.defined;. expect (wrapper.props ().src).to.be.defined;
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Can't edit my previous comment anymore, but a better rewording would be "How do I test with chai for a variable being a whole number?". Edit: The unfortunate thing is though that the definition of "whole number" in the dictionary says "a number without fractions; an integer." -
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expect(x).to.be.equal(y) 〉 assert.equal(x, y) 〉 .to.be.true 〉 jQuery, assertions, TDD and BDD, and other Chai examples. · One-page guide to Chai.js
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Thus, expect is indeed undefined because you never defined it. (I recommend chai) npm install chai then (see Amit Choukroune's comment pointing out to actually require chai) then. var expect = chai.expect; Share. Improve this answer. Follow edited Mar 24, 2018 at 16:57. starcwl.
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But let's suppose that now i need my method importCustomer to be async, the snippet code above won't work, because it will return a promise and the exception that i'm expecting is coming in the Promise Rejection.. How can i get this rejection in the chai? If we don't want to change our previous script too much, we can declare our rejection in the test file, like this:
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It works by adding the should property to all objects, but if a return value or variable value is undefined, there isn't a object to hold the property. The documentation gives some workarounds, for example: var should = require ('chai').should (); db.get (1234, function (err, doc) { should.not.exist (err); should.exist (doc); doc.should.be.an.
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Use in combination with any, all, contains, or have will affect what will pass. When used in conjunction with any, at least one key that is passed in must exist in the target object. This is regardless whether or not the have or contain qualifiers are used. Note, either any or all should be used in the assertion.