jest-image-snapshot | ✨ Jest matcher for image comparisons | Testing library

 by   americanexpress JavaScript Version: 6.4.0 License: Apache-2.0

kandi X-RAY | jest-image-snapshot Summary

kandi X-RAY | jest-image-snapshot Summary

jest-image-snapshot is a JavaScript library typically used in Telecommunications, Media, Media, Entertainment, Testing, Jest applications. jest-image-snapshot has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can install using 'npm i @caplin/jest-image-snapshot' or download it from GitHub, npm.

Jest matcher for image comparisons. Most commonly used for visual regression testing.

            kandi-support Support

              jest-image-snapshot has a medium active ecosystem.
              It has 3591 star(s) with 206 fork(s). There are 41 watchers for this library.
              There were 4 major release(s) in the last 12 months.
              There are 21 open issues and 144 have been closed. On average issues are closed in 126 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of jest-image-snapshot is 6.4.0

            kandi-Quality Quality

              jest-image-snapshot has 0 bugs and 0 code smells.

            kandi-Security Security

              jest-image-snapshot has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              jest-image-snapshot code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              jest-image-snapshot is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              jest-image-snapshot releases are available to install and integrate.
              Deployable package is available in npm.
              Installation instructions, examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed jest-image-snapshot and discovered the below as its top functions. This is intended to give you an instant insight into jest-image-snapshot implemented functionality, and help decide if they suit your requirements.
            • Creates a new diff file
            • Returns a configured function that matches the specified image .
            • Checks the result of a new result .
            • Creates a snapshot identifier for the current test results .
            • Writes and returns the diff to a snapshot
            • Updates a snapshot state with the given partial state .
            Get all kandi verified functions for this library.

            jest-image-snapshot Key Features

            No Key Features are available at this moment for jest-image-snapshot.

            jest-image-snapshot Examples and Code Snippets

            No Code Snippets are available at this moment for jest-image-snapshot.

            Community Discussions


            Angular Karma error after upgrading Angular from v7 to v8
            Asked 2021-Jun-04 at 08:28

            I have just updated my Angular v7 project to v8 using ng update. I have gone through all the steps, and the project builds fine. However, when I run ng test, I now get the following error (for all my components)



            Answered 2021-Jun-04 at 08:28

            You have either redeclare your component in declarations for test module, or import module that contains your component



            How can I force emscripten/em++/llvm to load constants from .rodata and/or perform better SIMD optimization?
            Asked 2020-Sep-25 at 02:57

            I'm an active author and maintainer of the SSIM.js and jest-image-snapshot. Currently, I'm working to optimize our image processing implementations to leverage WebAssembly where it can provide a performance improvement.

            Right now, I'm noticing that the code being generated adds unnecessary instructions from both the llvm assembly (webassembly text?) output perspective, as well as, the actual assembly output from Node.js (--print-wasm-code). Of particular note, it does super weird stuff when loading constants. For instance, look at the array named multiplier or the constant rounder in the three sections of code below. On GCC, multiplier would be stored in the .rodata section of the assembly to be loaded once or converted to an integer, and rounder would be inlined with a movd or movq. Here it seems to be inserting the values on each round of the loop. It's also doing some stuff with vpblendw that I'm totally clueless on.

            How do I fix this?



            Answered 2020-Sep-15 at 20:42

            Copying my answer from the Emscripten issue:

            The reason we don't use v128.const for this is that v128.const was only recently implemented in V8. To avoid breaking origin trial users, we can't update LLVM to emit v128.const until the relevant V8 patches roll into Chrome stable. I'm keeping an eye on this dashboard to determine when will be a good time to make this change. If you're using a more recent build of Chrome or some other execution environment that does support v128.const, you can try compiling your project with the -munimplemented-simd128 flag, which will enable v128.const in LLVM (but might also introduce other changes that you don't want). Once v128.const is widely available, it will be better for LLVM to use v128.const than to load vectors from memory because that allows the engine to determine the best way to materialize vectors given the runtime platform.

            It also might be worth considering porting performance-sensitive parts of your code to use the WebAssembly intrinsics header directly rather than relying on emulated SSE. That would reduce a layer of impedence mismatch between your code and the underlying machine code.

            Finally, if you notice suboptimal instruction selection anywhere, it would be helpful if you could file LLVM bugs (if it's on the code -> wasm side) or V8 bugs (if it's on the wasm -> native side) about the specific issues you see. That kind of feedback is extremely valuable to us.



            Is there anyway to get Node.JS and V8 to automatically vectorize simple loops?
            Asked 2020-Sep-12 at 21:29

            I'm currently working as an author and contributor to SSIM.js and jest-image-snapshot on behalf of Not a Typical Agency. A lot of the work I'm performing results in the creation of new algorithms to compare images in Javascript. After a lot of research and testing with AssemblyScript and WebAssembly, I've found that I can often get a higher-performing and more portable solutions with pure JS than I do with either of these two technologies. However, that only happens after performing an extensive code review of the generated assembly and performing many experiments.

            What I'd like to understand is if there's a way to get Node.JS/libV8 to automatically vectorize sections of code. As an example, I have a two-pass loop that calculates prefix sums for each pixel in an image horizontally then vertically. Skipping over the horizontal prefix sum (which can be challenging to vectorize for a real performance improvement with pure assembly), the vertical prefix sum should be super simple to optimize. Here's an example:



            Answered 2020-Sep-12 at 21:29

            V8 doesn't do any auto-vectorization currently. (Source: I'm a V8 developer.) This may or may not change in the future; people are toying with ideas every now and then, but I'm not aware of any specific plans.

            Wasm-SIMD is getting close to general availability (it's currently in "origin trial" experimental limited release phase), which will allow you to use SIMD instructions via WebAssembly. (Wasm being much lower level than JavaScript means that it generally gives you better control over what instruction sequence will be generated. The Wasm-SIMD instruction set in particular has been chosen such that it maps pretty well onto common hardware instructions.)


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install jest-image-snapshot

            Please note that Jest >=20 <=27 is a peerDependency. jest-image-snapshot will not work with anything below Jest 20.x.x.
            Unlike jest-managed snapshots, the images created by jest-image-snapshot will not be automatically removed by the -u flag if they are no longer needed. You can force jest-image-snapshot to remove the files by including the outdated-snapshot-reporter in your config and running with the environment variable JEST_IMAGE_SNAPSHOT_TRACK_OBSOLETE.


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