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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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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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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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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.
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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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Writing Tests With Mocha and Chai. The recommended way to organize your tests within your project is to put all of them in their own /test directory. By default, Mocha checks for unit tests using the globs ./test/*.js and ./test/*.coffee. From there, it will load and execute any file that calls the describe () method.
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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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How to Use should / expect Interface The most powerful extension provided by Chai as Promised is the eventually property. With it, you can transform any existing Chai assertion into one that acts on a promise:
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This comes in handy when being used with non-descript topics such as booleans or numbers. Should. The should style allows for the same chainable assertions as the expect interface, however it extends each object with a should property to start your chain. This style has some issues when used with Internet Explorer, so be aware of browser compatibility.
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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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expect(x).to.be.equal(y) ใ assert.equal(x, y) ใ .to.be.true ใ jQuery, assertions, TDD and BDD, and other Chai examples. ยท 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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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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1 I'm trying to test some code written in Typescript and my test cases are failing. I've simplified the code a bit to break down my issue. I'm new to ts/js so most likely I'm just missing something obvious.. I don't have any classes defined in the traditional sense where you can create a new object.
