chore: add rust rebuild test function feature

[suxin2017]

Related issue (if exists)

Summary

🤖 Generated by Copilot at 50a05bb

This pull request adds a new function test_hmr_fixture to the rspack_testing crate, which tests the hot module reloading (HMR) feature of the rspack tool. It also updates and adds some examples to demonstrate and compare the HMR feature with the normal build feature. The examples use hard-coded fixture paths and console log statements.

Walkthrough

🤖 Generated by Copilot at 50a05bb

• Add a new function test_hmr_fixture to the rspack_testing crate that tests the hot module replacement (HMR) feature of the compiler for a given fixture (link, link, link)
• Add two examples of how to use the test_hmr_fixture function in the test-cli.rs and test-hmr-cli.rs files (link, link, link)
• Add a new test.config.json file to the simple example to provide some configuration options for the testing framework or the compiler (link)
• Add some console log statements to the index.js file in the simple example to demonstrate or debug the HMR feature or the module caching behavior (link, link)
• Add the expected output of the compiler for the simple example in the main.js file (link)

[suxin2017]

Do we need hot update tests for rust, because I don't know how to do hot update tests in rust because of the lack of this tool

@ahabhgk @h-a-n-a

[ahabhgk]

I don't suggest add hmr test at rust side, hmr can't works without @rspack/dev-server, which is written in js, so normally we test hmr at js side.

[suxin2017]

I don't suggest add hmr test at rust side, hmr can't works without @rspack/dev-server, which is written in js, so normally we test hmr at js side.

Maybe there is something wrong with the description of my proposal. I want to add the test method of rebuild to the rust layer, through the changed and removed files, to facilitate testing possible problems in the rebuild process

[ahabhgk]

IMO test at rust side enable better debug experience, so rebuild test at rust side is nice to have, you can checkout packages/rspack/tests/WatchTestCases.test.ts for reference, it's written in js but the main idea is using writeFile to trigger the rebuild, I think we can do the same in rust side.

[suxin2017]

IMO test at rust side enable better debug experience, so rebuild test at rust side is nice to have, you can checkout packages/rspack/tests/WatchTestCases.test.ts for reference, it's written in js but the main idea is using writeFile to trigger the rebuild, I think we can do the same in rust side.

So it makes sense, right? So I'm going to follow up

[hyf0]

Thank you!