fix: Missing test coverage

[PROFeNoM]

Description

Oops, I guess I forgot about them in the initial PR #2464

Two Issues:

1. There were no coverage reports for Integrations because of compiled files (_generated*.php). These, not being the source files, were not counted as coverage. To fix this issue, un-compiled files are used.
2. Solving the latter issue resolved the problems related to test_integrations_*, but there was still no web test coverage. This is because a new Process is spawned in the web tests. Therefore, phpunit+xdebug doesn't have any visibility over what's happening, and no coverage is captured (despite it being where the valuable information lies). To fix this issue, a script (save_code_coverage.php) will be prepended to the queried file to collect the code coverage manually. These generated code coverage files will be saved in reports/cov, where they can be merged to a clover file using make merge_coverage_reports.

Notes:

• PHPUnit was removed from some composer.json, as it would sometimes conflict with the script (which uses phpunit's capabilities)
• tests/Appsec/Mock.php was modified to prevent its element from being loaded twice. This happened because of the introduction of save_code_coverage.php, which requires vendor/autoload.php
• The log "Backing up auto_prepend_file '%s'" is moved to a debug-type one, as it would 1. make the tests fail and 2. shouldn't be a warning.
• Some tests that were too flaky/failing under coverage mode were skipped. They are anyway tested when running in non-coverage mode.
• Coverage tests (integrations & web) are only tested on 7.4 & 8.2, to save time.
• The tracer-integrations and tracer-php-api flags have been merged into one flag, tracer-php. This makes it more comprehensive.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

Merging #2474 (c46a638) into master (552b0ef) will decrease coverage by 11.67%.
The diff coverage is 100.00%.

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #2474       +/-   ##
=============================================
- Coverage     76.55%   64.88%   -11.67%     
- Complexity      267     2574     +2307     
=============================================
  Files           138      214       +76     
  Lines         17457    23044     +5587     
  Branches        976        0      -976     
=============================================
+ Hits          13364    14953     +1589     
- Misses         3573     8091     +4518     
+ Partials        520        0      -520     

Flag	Coverage Δ
appsec-extension	?
tracer-extension	78.69% <100.00%> (ø)
tracer-integrations	?
tracer-php	47.82% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
ext/request_hooks.c	93.24% <100.00%> (ø)

... and 132 files with indirect coverage changes

---

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-29 11:33:48

Comparing candidate commit fdbf9ae in PR branch alex/feat/unit-tests-coverage with baseline commit 552b0ef in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 182 metrics, 0 unstable metrics.

[PROFeNoM]

The reason behind memory_limit=-1 here is the number of .cov files being processed. I'm talking about 100s of coverage files being merged (1 per request + 1 per test suite).

[bwoebi]

Looking good, let's merge it before the branches diverge :-)

[PROFeNoM]

Just did a final rebase onto master to be sure everything is good 👍 Will merge afterwards

[github-actions]

Snapshots difference summary

The following differences have been observed in committed snapshots. It is meant to help the reviewer.
The diff is simplistic, so please check some files anyway while we improve it.

If you need to update snapshots, please refer to CONTRIBUTING.md