Chai assert

For more information or to download plugins, view the documentation. Chai chai assert an assertion librarysimilar to Node's built-in assert.

The assert style is very similar to node. Of the three style options, assert is the only one that is not chainable. Check out the Style Guide for a comparison. Throw a failure. Asserts that object is truthy.

Chai assert

Cypress bundles the popular Chai assertion library, as well as helpful extensions for Sinon and jQuery , bringing you dozens of powerful assertions for free. If you're looking to understand how to use these assertions please read about assertions in our Introduction to Cypress guide. Aliases listed can be used interchangeably with their original chainer. You can see the entire list of available BDD Chai assertions here. These getters are also available for BDD assertions. They don't actually do anything, but they enable you to write clear, english sentences. You will commonly use these chainers after using DOM commands like: cy. These chainers are used on assertions with cy. Because we are using chai , that means you can extend it however you'd like. Cypress will "just work" with new assertions added to chai. You can:.

Asserts value is not an instance of constructor, chai assert. Asserts that set1 and set2 have the same members in the same order. Asserts that set1 and set2 have the same members in any order.

The assert style is very similar to node. Of the three style options, assert is the only one that is not chainable. Check out the Style Guide for a comparison. Throw a failure. Asserts non-strict inequality!

Chai is one of the most popular assertion libraries when writing test suites with Mocha. This article assumes you are already acquainted with Mocha, so check out our introduction to Mocha first. Chai supports 3 different assertion styles : expect , should , and assert. Here's how you would write a sum. The goal of Chai's expect and should interfaces is to allow you to write assertions in a way that mimics natural language. For example, to assert that a value is an array that includes '3', you would write:.

Chai assert

This section of the guide introduces you to the three different assertion styles that you may use in your testing environment. Once you have made your selection, it is recommended that you look at the API Documentation for your selected style. The assert style is exposed through assert interface. This provides the classic assert-dot notation, similar to that packaged with node. This assert module, however, provides several additional tests and is browser compatible. In all cases, the assert style allows you to include an optional message as the last parameter in the assert statement. These will be included in the error messages should your assertion not pass.

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Branches Tags. Asserts that value is not an array. MIT license. Releases 48 v5. Asserts that value is not false. Notifications Fork Star 8k. Asserts that set1 and set2 have the same members in the same order. If errMsgMatcher is provided, it also asserts that the error thrown will have a message matching errMsgMatcher. Assert The assert style is very similar to node. Can be used to assert the absence of a subset of properties in an object while ignoring inherited properties and checking for deep equality. Feel free to reach out to any of the core contributors with your questions or concerns.

This is an addon plugin for the Chai Assertion Library. Install via npm.

The assert style is very similar to node. Duplicates are ignored. The assertion does not match subclassed objects. Asserts that function will not throw an error that is an instance of constructor , or alternately that it will not throw an error with message matching regexp. When adding an element to the list and using a positive assertion , the test asserts a specific number of Todo items in our application. Chai offers a robust Plugin architecture for extending Chai's assertions and interfaces. Asserts value is not an instance of constructor. Asserts that value is not a number. Read more about these styles in our docs. Asserts that the target contains values. Asserts that value is a function. Report repository. Asserts that set1 and set2 have the same members in any order.