# carahue

> Declarative style diffing tool

Latest version **1.0.0** (published 2013-09-12) · 0 weekly downloads

## Install

```sh
npm install carahue
pnpm add carahue
yarn add carahue
bun add carahue
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 1.0.0 |
| Published | 2013-09-12 |
| First published | 2013-07-10 |
| Weekly downloads | 0 |
| TypeScript types | none |
| Module format | CommonJS |
| Node | >=0.8 |
| Dependencies | 8 |
| Known vulnerabilities | 0 (+2 in 1 direct dependencies) |
| Install scripts | no |
| GitHub stars | 1 |
| Author | Kevin Decker |
| Maintainers | kpdecker |
| Keywords | CSS, continuous-integration, phantomjs |

## Links

- npm: https://www.npmjs.com/package/carahue
- Repository: https://github.com/kpdecker/carahue
- Issues: https://github.com/kpdecker/carahue/issues
- npm.io page: https://npm.io/package/carahue

## Dependencies (8)

- [glob](https://npm.io/package/glob.md) ~3.2.1
- [async](https://npm.io/package/async.md) ~0.2.9
- [mocha](https://npm.io/package/mocha.md) ~1.12.0
- [colors](https://npm.io/package/colors.md) ~0.6.0-1
- [spooky](https://npm.io/package/spooky.md) ~0.2.3
- [wrench](https://npm.io/package/wrench.md) ~1.5.1
- [resemble](https://npm.io/package/resemble.md) ~1.0.1
- [underscore](https://npm.io/package/underscore.md) ~1.4.4

## Alternatives

- [style-dictionary](https://npm.io/package/style-dictionary.md) — 2.0M weekly downloads
- [postcss-merge-idents](https://npm.io/package/postcss-merge-idents.md) — 1.7M weekly downloads
- [@fontsource/noto-sans](https://npm.io/package/@fontsource/noto-sans.md) — 93.0K weekly downloads
- [uglifycss](https://npm.io/package/uglifycss.md) — 71.6K weekly downloads
- [mat4-interpolate](https://npm.io/package/mat4-interpolate.md) — 23.3K weekly downloads

## Recent versions

- 1.0.0 (latest) — 2013-09-12
- 0.0.1 — 2013-07-10

## README

# Carahue

Carahue integrates [Mocha][], [SpookyJS][], and [node-resemble][] for automated layout and render testing of web-based projects.

```javascript
describe('checkout', function() {
  page('signin', 'signin', function() {
    this
      .thenClick('.continue')
      .thenScreenshot('errors', '.info-header');
  });
});
```

See [example](https://github.com/kpdecker/carahue/tree/master/example) for complete examples.

## BDD

Carahue extends the Mocha BDD API with the `page` and `beforePage` helpers. These may be used in conjuntion with normal Mocha BDD directives but the Carahue context is only available within these methods.

### #page(name, route[, options, callback])

Defines a Carahue test.

- `name` Name of the test
- `route` Route/URL to execute the test. This is relative to `routePrefix`, if defined.
- `options` Optional hash object with additional test options.
  - `before` Callback executed before the screenshot but after all `beforePage` instances
  - `selector` Selector to use when taking screenshot. Defaults to the entire page.
  - `ignore` Elements to ignore when taking screenshots. This value is applied in addition to `globalIgnore`
  - `after` Callback to execute after the initial screenshot.
- `callback` Callback to execute after the initial screenshot. May be used to define additional tests. Superceeds `options.after`.

See [Context](#context) for discussion of the APIs available in the callback.

### #beforePage(callback)

Called before each `page` test. Allows for test setup after the page has loaded, but before any screenshots have been taken.

See [Context](#context) for discussion of the APIs available in the callback.

## Context

All callbacks in `page` and `beforePage` methods are run in the Carahue context. By default the context includes

- `thenCheck(query, check)` Applies/removes the `checked` attribute for elements matching `query`
- `thenWaitForImages()` Pauses test execution until all images in the DOM have been loaded
- `thenScreenshot(name[, selector, ignore])` Takes a screenshot of the current page state
  - `name` Name of the screenshot. This will be used to generate the output file name.
  - `selector` Optional selector to limit the screenshot to
  - `ignore` Optional list of elements to remove from the screenshot

Additionally the following Spooky methods are exposed on the context:
- `then`
- `thenClick`
- `thenEvaluate`
- `thenOpen`
- `thenOpenAndEvaluate`

Discussion of these methods and the call structures can be found in the [Spooky documentation][] and the [Casper documentation][].

### Extending Context

The execution context may be extended using the `carahue.context.extend(object)` method.

```javascript
carahue.context.extend({
  thenViewScreenshot: function(name) {
    return this.thenScreenshot(name, '[data-layout-cid]');
  }
});
```

Any fields exposed on the `object` parameter will be applied to future contexts.

## Configuration

Configuration may be set via the `carahue.config.extend(object)` method, which will augment the config with the passed object value.

```javascript
carahue.config.extend({
  casper: {
    viewportSize: {
      width: platform === 'ipad' ? 1024 : 320,
      height: platform === 'ipad' ? 768 : 480
    }
  }
});
```

Supported configuration values are:

- `child` : PhantomJS runtime options.

  Defaults to
```javascript
    {
      'ignore-ssl-errors': 'yes',
      'web-security': 'false'
    }
```

  Is augmented rather than replaced when passed to `extend`.

- `casper` : Casper runtime options

  Defaults to
```javascript
    {
      'pageSettings': {
        'userAgent': env.USER_AGENT
      },
      'logLevel': 'info',
      'verbose': true
    }
```

  Is augmented rather than replaced when passed to `extend`.

- `screencapturePath` : Path containing comparison screenshots.

  Defaults to `env.SCREENCAPTURE_PATH` or cwd

- `failurePath` : Path to output comparison images from failed tests to.

  Defaults to `env.FAILURE_PATH` or "failure"

- `routePrefix` : Prefix to apply to non-qualified routes.

  Defaults to empty.

- `globalIgnore` : Selector of elements that are always to be ignored when taking screenshots.

## Troubleshooting / Best Practices

## Mocking

The image comparison is fairly intollerant of changes to the output, by design. Where possible data should be mocked with static test data to reduce the number of changes due to content. When this is not possible, sections of consistently changing data should be ignored in the screenshot output to prevent false positive test failures.

## Screenshot Images

If using git for version control for the project it's advisable to not include screenshot images for the tests in a location outside of the immediate github repository as this can create a lot of overhead as the tests change over time. Projects such as [git-media][] may help resolve this issue.

## Logging

The Casper runtime by default generates a significant amount of logging but the majority of this is not output unless the log and verbosity levels are set appropriately:

```javascript
carahue.config.extend({
  casper: {
    logLevel: 'debug',
    verbose: true
  }
});
```

When set as above this will enable any casper specific logging instructions. `console.log` statemements run by the page itself will log regardless of the values set here.

Often times timeout or missing selector errors are seen due to unexpected state of the page when the test is run. This snippet may be used as a base to log the page's HTML struture if errors are seen.

```javascript
beforePage(function() {
  this
    .thenEvaluate(function() {
      console.log('This always logs ' + $('.foo').html());
    })
    .then(function() {
      // This logs if casper flags are set
      this.echo('test');
      this.debugHTML();
    });
});
```

## Phantom Wrappers

Spooky utilizes a stdio-based IPC layer that relies on the Casper instance having access to both stdout and stdin.

Occasionally packages will attempt to override the `phantomjs` executable on the path and not implement forwarding for both streams. When this occurs generally the carahue tests will all hang. If this behavior is seen then verify that the `phantomjs` process on the path is the cannonical binary.

## Testing

Carahue's internal tests may be run via

```sh
  grunt test
```

[Mocha]: http://visionmedia.github.io/mocha/
[SpookyJS]: https://github.com/WaterfallEngineering/SpookyJS
[node-resemble]: https://github.com/kpdecker/node-resemble
[Spooky documentation]: https://github.com/WaterfallEngineering/SpookyJS/wiki/Introduction
[Casper documentation]: http://docs.casperjs.org/en/latest/modules/index.html
[git-media]: https://github.com/schacon/git-media

---
_Source: https://npm.io/package/carahue · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._