fix: normalize snapshot paths for files outside tests directory

src/Repositories/SnapshotRepository.php

@@ -19,6 +19,7 @@ final class SnapshotRepository
      * Creates a snapshot repository instance.
      */
     public function __construct(
+        readonly private string $rootPath,
         readonly private string $testsPath,
         readonly private string $snapshotsPath,
     ) {}
@@ -103,7 +104,19 @@ final class SnapshotRepository
      */
     private function getSnapshotFilename(): string
     {
-        $relativePath = str_replace($this->testsPath, '', TestSuite::getInstance()->getFilename());
+        $testFile = TestSuite::getInstance()->getFilename();
+
+        if (str_starts_with($testFile, $this->testsPath)) {
+            // if the test file is in the tests directory
+            $startPath = $this->testsPath;
+        } else {
+            // if the test file is in the app, src, etc. directory
+            $startPath = $this->rootPath;
+        }
+
+        // relative path: we use substr() and not str_replace() to remove the start path
+        // for instance, if the $startPath is /app/ and the $testFile is /app/app/tests/Unit/ExampleTest.php, we should only remove the first /app/ from the path
+        $relativePath = substr($testFile, strlen($startPath));
 
         // remove extension from filename
         $relativePath = substr($relativePath, 0, (int) strrpos($relativePath, '.'));

src/TestSuite.php

@@ -78,6 +78,7 @@ final class TestSuite
         $this->afterAll = new AfterAllRepository;
         $this->rootPath = (string) realpath($rootPath);
         $this->snapshots = new SnapshotRepository(
+            $this->rootPath,
             implode(DIRECTORY_SEPARATOR, [$this->rootPath, $this->testPath]),
             implode(DIRECTORY_SEPARATOR, ['.pest', 'snapshots']),
         );