# TestCafe browser provider for Chrome with JPEG screenshot support

## Background

* Chrome's [`Page.captureScreenshot()`](https://chromedevtools.github.io/devtools-protocol/tot/Page/#method-captureScreenshot) is on average 5 times faster for JPEG as opposed to PNG. This has significant benefits when comparing screenshots for a large test suite.
* TestCafe's PNG postprocessing is slow ([follow the original issue here](https://github.com/DevExpress/testcafe/issues/3932)).

## Solution

* Using JPEG format in Chrome and ignoring TestCafe's postprocessing significantly improves performance.
* JPEG quality is set 100 to minimise the artifacts. Artifacts should not matter much for JPEG to JPEG comparison on the same platform. The comparison should be always done on the same environment (e.g. in Docker).
* Fragment screenshots are not supported.

## Usage

Install:
```bash
npm install testcafe-browser-provider-chromejpeg
```

Run:
```bash
testcafe chromejpeg:chrome my-test.js
```

## Known issues

Due to TestCafe being unable to process JPEGs, the following warning is expected at the end of test execution.
```
 Warnings (1):
 --
  Was unable to take a screenshot due to an error.

  Error: Invalid file signature
      at module.exports.Parser._parseSignature
      ...
```

TestCafe provider for Chrome with JPEG screenshot support. 

Introducing Socket Scanning for OpenVSX Extensions

testcafe-browser-provider-chromejpeg

TestCafe provider for Chrome with JPEG screenshot support.

gavoja

(Experimental) An ambiguous license classifier was found.

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Bad dependency semver

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Bidirectional unicode control characters

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Bin script confusion

This Chrome extension includes content scripts that execute JavaScript on specified websites.

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Chrome: Content Script

This Chrome extension requests host permissions to access specific websites or domains.

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Chrome: Host Permission

This Chrome extension requests permissions to access browser APIs, user data, or system features.

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Chrome: Permission

This Chrome extension requests wildcard host permissions that grant broad access to websites.

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Chrome: Wildcard Host Permission

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Chronological version anomaly

Project maintainer's SSH key has been compromised.

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Compromised SSH key

(Experimental) Copyleft license information was found.

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Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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High CVE

Uses debug, reflection and dynamic code execution features.

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Debug access

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Deprecated

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Filesystem access

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Wildcard dependency

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AI has identified unusual behaviors that may pose a security risk.

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AI-detected potential code anomaly

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AI-detected possible typosquat

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AI-detected potential malware

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High entropy strings

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Unicode homoglyphs

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HTTP dependency

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Install scripts

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Invalid manifest file

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Invisible chars

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testcafe-browser-provider-chromejpeg

TestCafe browser provider for Chrome with JPEG screenshot support

Background

Solution

Usage

Known issues

Keywords

Related posts

testcafe-browser-provider-chromejpeg

TestCafe browser provider for Chrome with JPEG screenshot support

Background

Solution

Usage

Known issues

Keywords

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