chai-jq

Chai-jQ

chai-jq is an alternate plugin for the Chai assertion library to provide jQuery-specific assertions.

Usage

You can install chai-jq with the following package managers:

NPM: npm install chai-jq
Bower: bower install chai-jq

The integration notes discuss how to properly patch Chai with the plugin in different environments (browser, AMD, Node.js). The API documentation is a good starting point to learn how to use chai-jq assertions in your tests. The site's own test suites also provide a decent introduction to the API:

Assertions

Integration

chai-jq works in your browser, with AMD/RequireJS, and in Node.js with JsDom.

Standard Browser: To use in a standard HTML page, include chai-jq.js after Chai.

<script src="chai.js"></script>
<script src="chai-jq.js"></script>

AMD Browser: To use in a RequireJS/AMD page, require in chai-jq and inject it into Chai before your test imports / runners begin:

require(["chai", "chai-jq"], function (chai, plugin) {
  // Inject plugin. 
  chai.use(plugin);
 
  // Rest of your test code here... 
});

Node.js / JsDom: To use in Node.js/JsDom, require in chai-jq and inject it into Chai before your test imports / runners begin:

var chai    = require("chai");
var plugin  = require("chai-jq");
 
// Inject plugin. 
chai.use(plugin);
 
// Rest of test code here...

Object Context Changes

One slight difference from how assertions in chai-jq work from Chai and other plugins is the switching of object context for certain assertions, currently:

$attr
$prop

In general usage, the object under test (e.g., the thing wrapped in an expect()) remains the current context, so you can do something like:

var $elem = $("<div id=\"hi\" foo=\"bar time\" />");
 
expect($elem)
  // Assertion object is `$elem` 
  .to.have.$attr("id", "hi").and
  // Assertion object is still `$elem` 
  .to.contain.$attr("foo", "bar");

In the above example, the jQuery object $elem remains the object under assertion for both $attr calls. However, in the special case for one of the enumerated assertions above where:

There is no expected assertion value given; and,
There are no negations (e.g., not) used in a chain.

Then, the object under assertion switches to the value of the effective method called. So, taking our example again, and calling $attr() without an expected value, we would have:

var $elem = $("<div id=\"hi\" foo=\"bar time\" />");
 
expect($elem)
  // Assertion object is `$elem` 
  .to.have.$attr("foo").and
    // Assertion object now changed to `$attr()` value: `"bar time"` 
    .to.equal("bar time").and
    .to.match(/^b/).and
    .to.not.have.length(2);

In the above example here, the object under assertion becomes the string "bar time" immediately after the call to $attr("foo") with no expected value.

`$visible`

Asserts that the element is visible.

Node.js/JsDom Note: JsDom does not currently infer zero-sized or hidden parent elements as hidden / visible appropriately.

expect($("<div>&nbsp;</div>"))
  .to.be.$visible;

See: http://api.jquery.com/visible-selector/

`$hidden`

Asserts that the element is hidden.

Node.js/JsDom Note: JsDom does not currently infer zero-sized or hidden parent elements as hidden / visible appropriately.

expect($("<div style=\"display: none\" />"))
  .to.be.$hidden;

See: http://api.jquery.com/hidden-selector/

`$val(expected, [message])`

expected (String|RegExp) value
message (String) failure message (optional)

Asserts that the element value matches a string or regular expression.

expect($("<input value='foo' />"))
  .to.have.$val("foo").and
  .to.have.$val(/^foo/);

See: http://api.jquery.com/val/

`$class(expected, [message])`

expected (String) class name
message (String) failure message (optional)

Asserts that the element has a class match.

expect($("<div class='foo bar' />"))
  .to.have.$class("foo").and
  .to.have.$class("bar");

See: http://api.jquery.com/hasClass/

`$attr(name, [expected], [message])`

name (String) attribute name
expected (String) attribute content (optional)
message (String) failure message (optional)
returns current object or attribute string value

Asserts that the target has exactly the given named attribute, or asserts the target contains a subset of the attribute when using the include or contain modifiers.

expect($("<div id=\"hi\" foo=\"bar time\" />"))
  .to.have.$attr("id", "hi").and
  .to.contain.$attr("foo", "bar");

Changes context to attribute string value when no expected value is provided:

expect($("<div id=\"hi\" foo=\"bar time\" />"))
  .to.have.$attr("foo").and
    .to.equal("bar time").and
    .to.match(/^b/);

See: http://api.jquery.com/attr/

`$data(name, [expected], [message])`

name (String) data-attribute name
expected (String) data-attribute content (optional)
message (String) failure message (optional)
returns current object or attribute string value

Asserts that the target has exactly the given named data-attribute, or asserts the target contains a subset of the data-attribute when using the include or contain modifiers.

expect($("<div data-id=\"hi\" data-foo=\"bar time\" />"))
  .to.have.$data("id", "hi").and
  .to.contain.$data("foo", "bar");

Changes context to data-attribute string value when no expected value is provided:

expect($("<div data-id=\"hi\" data-foo=\"bar time\" />"))
  .to.have.$data("foo").and
    .to.equal("bar time").and
    .to.match(/^b/);

See: http://api.jquery.com/data/

`$prop(name, [expected], [message])`

name (String) property name
expected (Object) property value (optional)
message (String) failure message (optional)
returns current object or property string value

Asserts that the target has exactly the given named property.

expect($("<input type=\"checkbox\" checked=\"checked\" />"))
  .to.have.$prop("checked", true).and
  .to.have.$prop("type", "checkbox");

Changes context to property string value when no expected value is provided:

expect($("<input type=\"checkbox\" checked=\"checked\" />"))
  .to.have.$prop("type").and
    .to.equal("checkbox").and
    .to.match(/^c.*x$/);

See: http://api.jquery.com/prop/

`$html(expected, [message])`

expected (String) HTML content
message (String) failure message (optional)

Asserts that the target has exactly the given HTML, or asserts the target contains a subset of the HTML when using the include or contain modifiers.

expect($("<div><span>foo</span></div>"))
  .to.have.$html("<span>foo</span>").and
  .to.contain.$html("foo");

See: http://api.jquery.com/html/

`$text(expected, [message])`

expected (String) text content
message (String) failure message (optional)

Asserts that the target has exactly the given text, or asserts the target contains a subset of the text when using the include or contain modifiers.

expect($("<div><span>foo</span> bar</div>"))
  .to.have.$text("foo bar").and
  .to.contain.$text("foo");

See: http://api.jquery.com/text/

`$css(expected, [message])`

expected (String) CSS property content
message (String) failure message (optional)

Asserts that the target has exactly the given CSS property, or asserts the target contains a subset of the CSS when using the include or contain modifiers.

Node.js/JsDom Note: Computed CSS properties are not correctly inferred as of JsDom v0.8.8. Explicit ones should get matched exactly.

Browser Note: Explicit CSS properties are sometimes not matched (in contrast to Node.js), so the plugin performs an extra check against explicit style properties for a match. May still have other wonky corner cases.

PhantomJS Note: PhantomJS also is fairly wonky and unpredictable with respect to CSS / styles, especially those that come from CSS classes and not explicity style attributes.

expect($("<div style=\"width: 50px; border: 1px dotted black;\" />"))
  .to.have.$css("width", "50px").and
  .to.have.$css("border-top-style", "dotted");

See: http://api.jquery.com/css/

Contributions

Please see the Contributions Guide for how to help out with the plugin.

We test all changes with Travis CI, report internal test coverage with Coveralls and check complexity / static analysis with Code Climate. Here is the status for our build, coverage, and complexity: