From 901b238d26c7ec5f412e9107eea2920f1cfd20cf Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 14:37:51 +0200
Subject: [PATCH 1/8] [CI] Use extracted tomasvotruba/fast-unit package instead
 of inline Go runner

---
 .github/workflows/benchmark_phpunit.yaml |  15 +-
 composer.json                            |   7 +
 utils-tests-runner/.gitignore            |   2 -
 utils-tests-runner/README.md             |  93 ------------
 utils-tests-runner/go.mod                |   3 -
 utils-tests-runner/main.go               | 181 -----------------------
 6 files changed, 15 insertions(+), 286 deletions(-)
 delete mode 100644 utils-tests-runner/.gitignore
 delete mode 100644 utils-tests-runner/README.md
 delete mode 100644 utils-tests-runner/go.mod
 delete mode 100644 utils-tests-runner/main.go

diff --git a/.github/workflows/benchmark_phpunit.yaml b/.github/workflows/benchmark_phpunit.yaml
index 5e8af57a633..a84367dfd68 100644
--- a/.github/workflows/benchmark_phpunit.yaml
+++ b/.github/workflows/benchmark_phpunit.yaml
@@ -1,7 +1,12 @@
 name: Benchmark PHPUnit
 
+<<<<<<< HEAD
 # A/B wall-time benchmark: serial phpunit vs the Go parallel runner.
 # Scheduled only (not on pull requests); runs every 2 hours on ubuntu.
+=======
+# A/B wall-time benchmark: serial phpunit vs the fast-unit parallel runner.
+# Scheduled only (not on pull requests); runs every 2 hours on ubuntu + windows.
+>>>>>>> 52991250dc ([CI] Use extracted tomasvotruba/fast-unit package instead of inline Go runner)
 # Reminder: cron fires only from the default branch, so this starts running
 # once the file is on `main`.
 on:
@@ -36,10 +41,6 @@ jobs:
 
             -   uses: "ramsey/composer-install@v4"
 
-            -   uses: actions/setup-go@v5
-                with:
-                    go-version: 'stable'
-
             -   name: Serial phpunit
                 shell: bash
                 run: |
@@ -48,9 +49,9 @@ jobs:
                     vendor/bin/phpunit
                     echo "| ${{ matrix.os }} | ${{ matrix.php-versions }} | serial | $((SECONDS - start))s |" >> "$GITHUB_STEP_SUMMARY"
 
-            -   name: Go parallel runner
+            -   name: fast-unit runner
                 shell: bash
                 run: |
                     start=$SECONDS
-                    go run ./utils-tests-runner/main.go
-                    echo "| ${{ matrix.os }} | ${{ matrix.php-versions }} | go-runner | $((SECONDS - start))s |" >> "$GITHUB_STEP_SUMMARY"
+                    vendor/bin/fastunit
+                    echo "| ${{ matrix.os }} | ${{ matrix.php-versions }} | fast-unit | $((SECONDS - start))s |" >> "$GITHUB_STEP_SUMMARY"
diff --git a/composer.json b/composer.json
index 7f3c636669d..f14d76d35f3 100644
--- a/composer.json
+++ b/composer.json
@@ -57,6 +57,7 @@
         "symplify/phpstan-rules": "^14.12",
         "symplify/vendor-patches": "^11.5",
         "tomasvotruba/class-leak": "^2.1",
+        "tomasvotruba/fast-unit": "^0.1",
         "tomasvotruba/type-coverage": "^2.3",
         "tomasvotruba/unused-public": "^2.2",
         "tracy/tracy": "^2.12"
@@ -64,6 +65,12 @@
     "replace": {
         "rector/rector": "self.version"
     },
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/tomasvotruba/fast-unit.git"
+        }
+    ],
     "autoload": {
         "psr-4": {
             "Rector\\": [
diff --git a/utils-tests-runner/.gitignore b/utils-tests-runner/.gitignore
deleted file mode 100644
index e8d9d4d50e0..00000000000
--- a/utils-tests-runner/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-/fast-phpunit
-/fast-phpunit.exe
diff --git a/utils-tests-runner/README.md b/utils-tests-runner/README.md
deleted file mode 100644
index 4b930c5113a..00000000000
--- a/utils-tests-runner/README.md
+++ /dev/null
@@ -1,93 +0,0 @@
-# fast-phpunit (proof of concept)
-
-Run the PHPUnit suite **~4x faster** by splitting test classes across parallel
-workers that each boot PHP **once** and run many classes in a single process.
-
-## Speed — CI, per platform (GitHub runners, 4 vCPU, full suite)
-
-Serial `vendor/bin/phpunit` vs this runner, measured on the CI run step:
-
-| Platform | Serial | Go runner | Speedup |
-| --- | --- | --- | --- |
-| ubuntu-latest | 31s | **16s** | ~1.9x |
-| windows-latest | **116s** | **67s** | **~1.7x** |
-
-Windows is the slow platform (~3.7x slower than Ubuntu serial); the runner cuts
-~49s off it. Both run the full suite and pass.
-
-## Speed — local (24-core host, full suite)
-
-Full suite: **685 test classes / 5833 fixtures**.
-
-| Mode | Wall time | vs serial |
-| --- | --- | --- |
-| Serial `vendor/bin/phpunit` (1 process) | **38.3s** | 1.0x |
-| `fast-phpunit -p 8` | ~11s | ~3.5x |
-| `fast-phpunit -p 12` | **~9s** | **~4.2x** |
-| `fast-phpunit -p 24` | ~9.8s | ~3.9x |
-
-Subset — `rules-tests/CodeQuality` (86 classes / 771 fixtures):
-
-| Mode | Wall time |
-| --- | --- |
-| Serial (1 process) | 5.71s |
-| Process-per-class, `xargs -P8` | 8.55s (**slower than serial**) |
-| `fast-phpunit -p 8` | **2.43s** |
-
-Sweet spot is ~12 workers; more does not help, because the heaviest chunk
-bounds wall time and 20+ concurrent PHP processes start contending.
-
-## Why it is faster
-
-Bootstrap dominates a Rector test class, not the assertions:
-
-| Step | Time |
-| --- | --- |
-| Boot only (container build, 0 tests) | ~0.23s — fixed, per process |
-| One class, 27 fixtures (warm) | 0.92s → ~26ms/fixture |
-
-Average class has ~7 fixtures, so **bootstrap is ~56% of an average class's run
-time**. Any runner that spawns a fresh process per class pays that 0.23s boot
-685 times — which is why process-per-class parallelism is slower than serial
-(see subset table).
-
-This runner splits classes into N chunks balanced by fixture count, and each
-worker runs its whole chunk in one warm process — so the container is built N
-times, not 685 times.
-
-## Usage
-
-```bash
-cd utils-tests-runner && go build -o fast-phpunit .
-cd ..
-utils-tests-runner/fast-phpunit -p 12                          # whole suite
-utils-tests-runner/fast-phpunit -p 8 rules-tests/CodeQuality   # a subtree
-```
-
-Flags: `-p` workers (default = CPU count), `-bin` phpunit path.
-
-## Isolation — required to make it correct
-
-Two shared-state issues surface when many classes share a process; both are
-handled so any chunking is safe.
-
-1. **Shared temp cache (cross-process).** Rector caches parsed files under
-   `sys_get_temp_dir()/rector_cached_files`; parallel processes racing that
-   directory throw `Failed to open directory` / `Directory not empty`. Each
-   worker gets its own `TMPDIR`.
-
-2. **Leaked `phpVersion()` (in-process) — a latent bug, fixed here.**
-   `phpVersion(...)` is stored in the static `SimpleParameterProvider` and was
-   never reset between classes, so a version-bound class leaks its version into
-   the next class in the same process — a version-less class then sees, e.g.,
-   PHP 8.1 instead of the test default (`PhpVersion::PHP_10`) and produces wrong
-   output. The serial suite passes only because of its class ordering; any
-   reshuffle (this tool **or** paratest) can trigger it. Fixed in
-   `AbstractRectorTestCase::tearDownAfterClass()` by resetting
-   `PHP_VERSION_FEATURES` to the test default.
-
-## Status
-
-Proof of concept. Standalone Go helper that shells out to the existing
-`vendor/bin/phpunit`, so it does not change how tests are written or how CI
-runs. Pure Go, no `.php`, so it is invisible to ECS / PHPStan / Rector.
diff --git a/utils-tests-runner/go.mod b/utils-tests-runner/go.mod
deleted file mode 100644
index 067b5c90707..00000000000
--- a/utils-tests-runner/go.mod
+++ /dev/null
@@ -1,3 +0,0 @@
-module rector/fast-phpunit
-
-go 1.26.4
diff --git a/utils-tests-runner/main.go b/utils-tests-runner/main.go
deleted file mode 100644
index ee03c9d4195..00000000000
--- a/utils-tests-runner/main.go
+++ /dev/null
@@ -1,181 +0,0 @@
-// Command fast-phpunit runs the PHPUnit suite in parallel by splitting test
-// classes into N balanced "warm" chunks: each worker boots PHP once and runs
-// many test classes in a single process, so the container is built N times
-// instead of once per class (as tools that spawn a process per chunk do).
-//
-// Balancing is by fixture count, since Rector rule tests iterate one assertion
-// per .php.inc fixture, so fixture count approximates a class's runtime.
-package main
-
-import (
-	"flag"
-	"fmt"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-	"runtime"
-	"sort"
-	"strings"
-	"sync"
-	"time"
-)
-
-type testClass struct {
-	path   string
-	weight int // fixture count, min 1
-}
-
-var fixtureCountRe = regexp.MustCompile(`\.php\.inc$`)
-
-func main() {
-	workers := flag.Int("p", runtime.NumCPU(), "number of parallel workers")
-	php := flag.String("php", "php", "php interpreter")
-	// the real PHP entry script (runs cross-platform via `php`); vendor/bin/phpunit
-	// is a shell/batch proxy on Windows and cannot be passed to php directly.
-	phpunit := flag.String("bin", "vendor/phpunit/phpunit/phpunit", "phpunit entry script")
-	flag.Parse()
-
-	dirs := flag.Args()
-	if len(dirs) == 0 {
-		dirs = []string{"rules-tests", "tests"}
-	}
-
-	classes := discover(dirs)
-	if len(classes) == 0 {
-		fmt.Fprintln(os.Stderr, "no test classes found")
-		os.Exit(1)
-	}
-
-	chunks := balance(classes, *workers)
-
-	start := time.Now()
-	failed := run(chunks, *php, *phpunit, *workers)
-	elapsed := time.Since(start)
-
-	totalFixtures := 0
-	for _, c := range classes {
-		totalFixtures += c.weight
-	}
-	fmt.Printf("\n%d classes, %d fixtures, %d chunks, %d workers\n",
-		len(classes), totalFixtures, len(chunks), *workers)
-	fmt.Printf("wall time: %.2fs\n", elapsed.Seconds())
-
-	if failed > 0 {
-		fmt.Printf("FAILED chunks: %d\n", failed)
-		os.Exit(1)
-	}
-	fmt.Println("OK")
-}
-
-// discover finds *Test.php files and weights each by sibling Fixture/ file count.
-func discover(dirs []string) []testClass {
-	var classes []testClass
-	for _, dir := range dirs {
-		_ = filepath.WalkDir(dir, func(path string, d os.DirEntry, err error) error {
-			if err != nil || d.IsDir() || !strings.HasSuffix(path, "Test.php") {
-				return nil
-			}
-			classes = append(classes, testClass{path: path, weight: fixtureWeight(path)})
-			return nil
-		})
-	}
-	return classes
-}
-
-func fixtureWeight(testPath string) int {
-	fixtureDir := filepath.Join(filepath.Dir(testPath), "Fixture")
-	entries, err := os.ReadDir(fixtureDir)
-	if err != nil {
-		return 1
-	}
-	count := 0
-	for _, e := range entries {
-		if !e.IsDir() && fixtureCountRe.MatchString(e.Name()) {
-			count++
-		}
-	}
-	if count < 1 {
-		return 1
-	}
-	return count
-}
-
-// balance greedily packs classes (heaviest first) into n bins, always adding to
-// the lightest bin. Minimizes the heaviest chunk, so wall time is bounded by the
-// slowest worker rather than by unlucky static splits.
-func balance(classes []testClass, n int) [][]testClass {
-	sort.Slice(classes, func(i, j int) bool {
-		return classes[i].weight > classes[j].weight
-	})
-	bins := make([][]testClass, n)
-	loads := make([]int, n)
-	for _, c := range classes {
-		min := 0
-		for i := 1; i < n; i++ {
-			if loads[i] < loads[min] {
-				min = i
-			}
-		}
-		bins[min] = append(bins[min], c)
-		loads[min] += c.weight
-	}
-	var out [][]testClass
-	for _, b := range bins {
-		if len(b) > 0 {
-			out = append(out, b)
-		}
-	}
-	return out
-}
-
-func run(chunks [][]testClass, php, phpunit string, workers int) int {
-	sem := make(chan struct{}, workers)
-	var wg sync.WaitGroup
-	var mu sync.Mutex
-	failed := 0
-
-	for idx, chunk := range chunks {
-		wg.Add(1)
-		go func(idx int, chunk []testClass) {
-			defer wg.Done()
-			sem <- struct{}{}
-			defer func() { <-sem }()
-
-			// Each worker gets its own temp dir so Rector's file cache
-			// (sys_get_temp_dir()/rector_cached_files) and the fixture temp
-			// dumper never race across processes. sys_get_temp_dir() reads
-			// TMPDIR on Linux/macOS and TMP/TEMP on Windows, so set all three.
-			tmp := filepath.Join(os.TempDir(), fmt.Sprintf("fast-phpunit-%d", idx))
-			_ = os.MkdirAll(tmp, 0o755)
-			defer os.RemoveAll(tmp)
-
-			// invoke via `php <phpunit>` so it works uniformly on Windows,
-			// where vendor/bin/phpunit is not directly executable.
-			args := make([]string, 0, len(chunk)+1)
-			args = append(args, phpunit)
-			for _, c := range chunk {
-				args = append(args, c.path)
-			}
-			cmd := exec.Command(php, args...)
-			cmd.Env = append(os.Environ(), "TMPDIR="+tmp, "TMP="+tmp, "TEMP="+tmp)
-			out, err := cmd.CombinedOutput()
-			if err != nil {
-				mu.Lock()
-				failed++
-				fmt.Printf("chunk FAILED (%d classes): %v\n%s\n", len(chunk), err, tail(string(out), 15))
-				mu.Unlock()
-			}
-		}(idx, chunk)
-	}
-	wg.Wait()
-	return failed
-}
-
-func tail(s string, lines int) string {
-	parts := strings.Split(strings.TrimRight(s, "\n"), "\n")
-	if len(parts) > lines {
-		parts = parts[len(parts)-lines:]
-	}
-	return strings.Join(parts, "\n")
-}

From bdc3985abfe5840a99c7497962fc4819103fcc77 Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 14:41:59 +0200
Subject: [PATCH 2/8] Drop VCS repository entry, resolve fast-unit from
 Packagist

---
 composer.json | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/composer.json b/composer.json
index f14d76d35f3..a85eedfe0e6 100644
--- a/composer.json
+++ b/composer.json
@@ -65,12 +65,6 @@
     "replace": {
         "rector/rector": "self.version"
     },
-    "repositories": [
-        {
-            "type": "vcs",
-            "url": "https://github.com/tomasvotruba/fast-unit.git"
-        }
-    ],
     "autoload": {
         "psr-4": {
             "Rector\\": [

From 333f03614398f58e99f5273cb1f94149c62c5351 Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 15:08:44 +0200
Subject: [PATCH 3/8] Use fast-unit as main test runner; make failing fixture
 path clickable

- key fixture data provider by path, so a failure prints the exact
  clickable .php.inc file instead of 'data set #N'
- tests.yaml runs vendor/bin/fastunit over tests + rules-tests + utils/phpstan/tests
---
 .github/workflows/tests.yaml              | 2 +-
 src/Testing/Fixture/FixtureFileFinder.php | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index a3378b794f7..33930c13b9b 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -38,4 +38,4 @@ jobs:
 
             -   uses: "ramsey/composer-install@v4"
 
-            -   run: vendor/bin/phpunit --colors
+            -   run: vendor/bin/fastunit tests rules-tests utils/phpstan/tests
diff --git a/src/Testing/Fixture/FixtureFileFinder.php b/src/Testing/Fixture/FixtureFileFinder.php
index 10e2288ceca..65c941b6db0 100644
--- a/src/Testing/Fixture/FixtureFileFinder.php
+++ b/src/Testing/Fixture/FixtureFileFinder.php
@@ -11,7 +11,7 @@ final class FixtureFileFinder
 {
     /**
      * @api used in tests
-     * @return Iterator<array<int, string>>
+     * @return Iterator<string, array<int, string>>
      */
     public static function yieldDirectory(string $directory, string $suffix = '*.php.inc'): Iterator
     {
@@ -22,7 +22,9 @@ public static function yieldDirectory(string $directory, string $suffix = '*.php
             ->sortByName();
 
         foreach ($finder as $fileInfo) {
-            yield [$fileInfo->getRealPath()];
+            // key the data set by fixture path, so a failure prints the exact
+            // clickable ".php.inc" file instead of an anonymous "data set #N"
+            yield $fileInfo->getRealPath() => [$fileInfo->getRealPath()];
         }
     }
 }

From 6bf42332f6eca913f61cdfb358d2dd0d0e00ecf4 Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 16:38:42 +0200
Subject: [PATCH 4/8] Fix RectorConfigTest global-state leak under warm-process
 runner; add composer test script

The parallel runner batches many test classes into one warm PHP process,
which exposed a latent leak: RectorConfig::configure() marks only the first
call in a process as 'root', so RectorConfigTest's root-rule assertions failed
when another class configured first. Add RectorConfig::resetRecreated() and
reset it (plus the registered-rule lists) in the test's setUp.

Also add composer 'test' script running fastunit over the suite dirs.
---
 composer.json                     |  3 ++-
 src/Config/RectorConfig.php       | 10 ++++++++++
 tests/Config/RectorConfigTest.php | 14 ++++++++++++++
 3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/composer.json b/composer.json
index a85eedfe0e6..01997f5db17 100644
--- a/composer.json
+++ b/composer.json
@@ -104,8 +104,9 @@
         "complete-check": [
             "@check-cs",
             "@phpstan",
-            "phpunit"
+            "@test"
         ],
+        "test": "vendor/bin/fastunit tests rules-tests utils/phpstan/tests",
         "check-cs": "vendor/bin/ecs check --ansi",
         "fix-cs": "vendor/bin/ecs check --fix --ansi",
         "phpstan": "vendor/bin/phpstan analyse --ansi --memory-limit=512M",
diff --git a/src/Config/RectorConfig.php b/src/Config/RectorConfig.php
index ef492c30300..8ff649c093f 100644
--- a/src/Config/RectorConfig.php
+++ b/src/Config/RectorConfig.php
@@ -59,6 +59,16 @@ final class RectorConfig extends Container
 
     private static ?bool $recreated = null;
 
+    /**
+     * @internal Resets the root-config detection, so tests that assert on root
+     * rule registration behave the same whether run alone or batched into one
+     * warm process by a parallel runner.
+     */
+    public static function resetRecreated(): void
+    {
+        self::$recreated = null;
+    }
+
     public static function configure(): RectorConfigBuilder
     {
         if (self::$recreated === null) {
diff --git a/tests/Config/RectorConfigTest.php b/tests/Config/RectorConfigTest.php
index f26396d6288..0f054548c7c 100644
--- a/tests/Config/RectorConfigTest.php
+++ b/tests/Config/RectorConfigTest.php
@@ -4,6 +4,7 @@
 
 namespace Rector\Tests\Config;
 
+use Rector\Config\RectorConfig;
 use Rector\Configuration\Option;
 use Rector\Configuration\Parameter\SimpleParameterProvider;
 use Rector\Renaming\Rector\MethodCall\RenameMethodRector;
@@ -17,6 +18,19 @@
 
 final class RectorConfigTest extends AbstractLazyTestCase
 {
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        // these tests assert on root rule registration, which is decided by a
+        // static "first configure() in the process is root" flag; reset it and
+        // the registered-rule lists so the assertions hold whether this class
+        // runs alone or batched into one warm process by a parallel runner
+        RectorConfig::resetRecreated();
+        SimpleParameterProvider::setParameter(Option::REGISTERED_RECTOR_RULES, []);
+        SimpleParameterProvider::setParameter(Option::ROOT_STANDALONE_REGISTERED_RULES, []);
+    }
+
     public function test(): void
     {
         $rectorConfig = $this->getContainer();

From 7f25db56ff2c061830128618f6025e8c6880fea7 Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 17:09:26 +0200
Subject: [PATCH 5/8] Add test-tia composer script; gitignore .fastunit-cache

---
 .gitignore    | 3 +++
 composer.json | 1 +
 2 files changed, 4 insertions(+)

diff --git a/.gitignore b/.gitignore
index 9c96bd27896..4eb499d7d8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,9 @@ composer.lock
 .phpunit.cache
 .fastunit-cache
 
+# fast-unit test impact analysis cache
+/.fastunit-cache
+
 # scoped & downgraded version
 php-scoper.phar
 box.phar
diff --git a/composer.json b/composer.json
index 01997f5db17..183e9a62790 100644
--- a/composer.json
+++ b/composer.json
@@ -107,6 +107,7 @@
             "@test"
         ],
         "test": "vendor/bin/fastunit tests rules-tests utils/phpstan/tests",
+        "test-tia": "vendor/bin/fastunit -tia tests rules-tests utils/phpstan/tests",
         "check-cs": "vendor/bin/ecs check --ansi",
         "fix-cs": "vendor/bin/ecs check --fix --ansi",
         "phpstan": "vendor/bin/phpstan analyse --ansi --memory-limit=512M",

From bc7fd22b2dff72bef87245c544c451feb5aa309a Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 17:42:25 +0200
Subject: [PATCH 6/8] Resolve rebase conflicts: benchmark comment + dedup
 .fastunit-cache gitignore

- benchmark: keep fast-unit wording, ubuntu-only (Windows dropped in #8352)
- .gitignore: main already ignores .fastunit-cache; drop the duplicate
---
 .github/workflows/benchmark_phpunit.yaml | 7 +------
 .gitignore                               | 3 ---
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/.github/workflows/benchmark_phpunit.yaml b/.github/workflows/benchmark_phpunit.yaml
index a84367dfd68..c510d82e0e1 100644
--- a/.github/workflows/benchmark_phpunit.yaml
+++ b/.github/workflows/benchmark_phpunit.yaml
@@ -1,12 +1,7 @@
 name: Benchmark PHPUnit
 
-<<<<<<< HEAD
-# A/B wall-time benchmark: serial phpunit vs the Go parallel runner.
-# Scheduled only (not on pull requests); runs every 2 hours on ubuntu.
-=======
 # A/B wall-time benchmark: serial phpunit vs the fast-unit parallel runner.
-# Scheduled only (not on pull requests); runs every 2 hours on ubuntu + windows.
->>>>>>> 52991250dc ([CI] Use extracted tomasvotruba/fast-unit package instead of inline Go runner)
+# Scheduled only (not on pull requests); runs every 2 hours on ubuntu.
 # Reminder: cron fires only from the default branch, so this starts running
 # once the file is on `main`.
 on:
diff --git a/.gitignore b/.gitignore
index 4eb499d7d8a..9c96bd27896 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,9 +12,6 @@ composer.lock
 .phpunit.cache
 .fastunit-cache
 
-# fast-unit test impact analysis cache
-/.fastunit-cache
-
 # scoped & downgraded version
 php-scoper.phar
 box.phar

From a047466a7f348e6f0ba94e149779851c8a947b6e Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 17:45:57 +0200
Subject: [PATCH 7/8] fix unique fixture name

---
 .../Fixture/final_private_constructor.php.inc                   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rules-tests/Php80/Rector/ClassMethod/FinalPrivateToPrivateVisibilityRector/Fixture/final_private_constructor.php.inc b/rules-tests/Php80/Rector/ClassMethod/FinalPrivateToPrivateVisibilityRector/Fixture/final_private_constructor.php.inc
index 069bf70a364..c795868a63f 100644
--- a/rules-tests/Php80/Rector/ClassMethod/FinalPrivateToPrivateVisibilityRector/Fixture/final_private_constructor.php.inc
+++ b/rules-tests/Php80/Rector/ClassMethod/FinalPrivateToPrivateVisibilityRector/Fixture/final_private_constructor.php.inc
@@ -2,7 +2,7 @@
 
 namespace Rector\Tests\Php80\Rector\ClassMethod\FinalPrivateToPrivateVisibilityRector\Fixture;
 
-abstract class FinalPrivate
+abstract class FinalPrivateConstructor
 {
     final private function __construct()
     {

From b80b60515a2a92b55b82f74d7f817e8b632eae6b Mon Sep 17 00:00:00 2001
From: Tomas Votruba <tomas.vot@gmail.com>
Date: Sat, 15 Aug 2026 20:53:58 +0200
Subject: [PATCH 8/8] Add optional -tia fast-feedback job on PRs

Runs only tests whose static dependency closure changed, with a persisted
.fastunit-cache via actions/cache. PR-only and non-blocking in intent: the
full 'tests' job stays the authoritative gate, since -tia over-approximates
but cannot see dynamic (reflection / class-string) dependencies.
---
 .github/workflows/tests.yaml | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 33930c13b9b..db0052313ec 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -39,3 +39,35 @@ jobs:
             -   uses: "ramsey/composer-install@v4"
 
             -   run: vendor/bin/fastunit tests rules-tests utils/phpstan/tests
+
+    # optional fast feedback on pull requests: run only the tests whose static
+    # dependency closure changed. NOT a merge gate -- the full "tests" job above
+    # stays authoritative, since -tia over-approximates but cannot see dynamic
+    # (reflection / class-string) dependencies.
+    tests_tia:
+        if: github.event_name == 'pull_request'
+        runs-on: ubuntu-latest
+        timeout-minutes: 4
+
+        name: PHP 8.4 tests (impacted only)
+        steps:
+            -   uses: actions/checkout@v5
+
+            # restore the newest cached hash snapshot; save a fresh one per commit
+            -   uses: actions/cache@v4
+                with:
+                    path: .fastunit-cache
+                    key: fastunit-tia-${{ github.sha }}
+                    restore-keys: |
+                        fastunit-tia-
+
+            -
+                uses: shivammathur/setup-php@v2
+                with:
+                    php-version: '8.4'
+                    coverage: none
+                    ini-values: zend.assertions=1
+
+            -   uses: "ramsey/composer-install@v4"
+
+            -   run: vendor/bin/fastunit -tia tests rules-tests utils/phpstan/tests