diff --git a/src/Repositories/TestRepository.php b/src/Repositories/TestRepository.php
index 3a39b0a7..d43ed458 100644
--- a/src/Repositories/TestRepository.php
+++ b/src/Repositories/TestRepository.php
@@ -29,7 +29,7 @@ final class TestRepository
     /**
      * @var array<string, TestCaseFactory>
      */
-    public $state = [];
+    private $state = [];
 
     /**
      * @var array<string, array<int, array<int, string|Closure>>>
@@ -44,6 +44,16 @@ final class TestRepository
         return count($this->state);
     }
 
+    /**
+     * @return array<int, string>
+     */
+    public function getFilenames(): array
+    {
+        return array_values(array_map(function (TestCaseFactory $factory): string {
+            return $factory->filename;
+        }, $this->state));
+    }
+
     /**
      * Calls the given callable foreach test case.
      */
diff --git a/tests/Unit/TestSuite.php b/tests/Unit/TestSuite.php
index 62cc724d..96263a3a 100644
--- a/tests/Unit/TestSuite.php
+++ b/tests/Unit/TestSuite.php
@@ -22,3 +22,15 @@ it('alerts users about tests with arguments but no input', function () {
     DatasetMissing::class,
     sprintf("A test with the description '%s' has %d argument(s) ([%s]) and no dataset(s) provided in %s", 'foo', 1, 'int $arg', __FILE__),
 );
+
+it('can return an array of all test suite filenames', function() {
+    $testSuite = new TestSuite(getcwd(), 'tests');
+    $test = function () {};
+    $testSuite->tests->set(new \Pest\Factories\TestCaseFactory(__FILE__, 'foo', $test));
+    $testSuite->tests->set(new \Pest\Factories\TestCaseFactory(__FILE__, 'bar', $test));
+
+    expect($testSuite->tests->getFilenames())->toEqual([
+        __FILE__,
+        __FILE__,
+    ]);
+});