Chai assert

Cypress bundles the popular Chai assertion library, as well as helpful extensions for Sinon and jQuerybringing you dozens of powerful assertions for chai assert. 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.

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! Asserts that actual is deeply equal to expected.

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.

Chai is an assertion librarysimilar to Node's built-in assert.

For more information or to download plugins, view the documentation. Chai is an assertion library , similar to Node's built-in assert. It makes testing much easier by giving you lots of assertions you can run against your code. To install it, type:. You can also use it within the browser; install via npm and use the chai. For example:.

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. Both use the same chainable language to construct assertions, but they differ in the way an assertion is initially constructed. In the case of should , there are also some caveats and additional tools to overcome the caveats.

Chai assert

The BDD styles are expect and should. Both use the same chainable language to construct assertions, but they differ in the way an assertion is initially constructed. Check out the Style Guide for a comparison. Just because you can negate any assertion with.

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To install it, type:. Cypress will automatically retry the callback function until it passes or the command times out. We will do our best to respond in a timely manner. Asserts that object has a property named by property , but with a value different from that given by value. Asserts that object has a direct or inherited property named by property. Asserts that object does not have a direct or inherited property named by property with value given by value. Can be used to assert the absence of a value in an array, a substring in a string, or a subset of properties in an object. Asserts that object has a direct or inherited property named by property , which can be a string using dot- and bracket-notation for nested reference. View all files. Assert that actual is not deeply equal to expected. Duplicates are ignored. Check out our example recipe extending chai with new assertions.

The assert style is very similar to node.

Asserts that object is not sealed. Dismiss alert. Asserts that value is a number. Read more about these styles in our docs. Assert that actual is not deeply equal to expected. Can be used to assert the inclusion of a subset of properties in an object while checking for deep equality. Asserts that set1 and set2 have the same members in any order. Asserts that value is null. Asserts that object has a direct or inherited property named by property with a value given by value. Can be used to assert the absence of a value in an array, a substring in a string, or a subset of properties in an object. You can also use it within the browser; install via npm and use the chai. Here are a few issues other contributors frequently ran into when opening pull requests:. Asserts that value is not a function. Related Projects.