Chai assert

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

Chai 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. Asserts that object is falsy. Asserts non-strict inequality! Asserts strict inequality! Asserts that actual is deeply equal to expected. Assert that actual is not deeply equal to expected. Asserts that value is true. Asserts that value is not true. Asserts that value is false. Asserts that value is not false. Asserts that value is null.

Asserts that object is sealed cannot have new properties added to it and its existing properties cannot be removed. Sponsor this project opencollective.

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! Asserts strict inequality!

Chai as Promised extends Chai with a fluent language for asserting facts about promises. Notice : either return or notify done must be used with promise assertions. This can be a slight departure from the existing format of assertions being used on a project or by a team. Those other assertions are likely synchronous and thus do not require special handling. 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:. There are also a few promise-specific extensions with the usual expect equivalents also available :. Chai as Promised does not have any intrinsic support for testing promise progress callbacks. The properties you would want to test are probably much better suited to a library like Sinon. JS , perhaps in conjunction with Sinon—Chai :.

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. The BDD style comes in two flavors: expect and should.

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Asserts that object is not extensible. Branches Tags. Cypress will "just work" with new assertions added to chai. Throw a failure. Asserts that value is not an array. Assert that actual is not deeply equal to expected. Asserts strict inequality! The assert style is very similar to node. When asserting a subset of properties in an object, the object is searched to confirm that at least one of the given property keys is either not present or not strictly equal to the given property value. These chainers are used on assertions with cy. Asserts that object does not have a property named by property with value given by value. You switched accounts on another tab or window. Asserts that object has a direct or inherited property named by property with a value given by value. Asserts that object has a property named by property , which can be a string using dot- and bracket-notation for deep reference.

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

Asserts that object contains all of the keys provided. Latest commit. Compares two values using operator. Asserts that object has a property named by property with value given by value. Tip: read about assertions against text with non-breaking space entities in How do I get an element's text contents? Asserts that object does not have at least one of the keys provided. Works for strings and arrays. Can be used to assert the inclusion of a subset of properties in an object while ignoring inherited properties. You switched accounts on another tab or window. Import assertion styles as local variables. Skip to content. Asserts that value is not false. Asserts value is not an instance of constructor. Asserts that object is frozen cannot have new properties added to it and its existing properties cannot be modified. Go to file.