test: cover parallel group-filtered runs whose workers end on fully filtered files

tests/.snapshots/success.txt

@@ -2288,6 +2288,8 @@
   ✓ parallel records the test run history
   ✓ parallel does not record the test run history when asked not to with ('--do-not-cache-result')
   ✓ parallel does not record the test run history when asked not to with ('--do-not-record-test-run-history')
+  ✓ parallel group-filtered run is not considered empty when a worker ends on a fully filtered file
+  ✓ parallel group-filtered run still fails when the selection matches no tests
 
    PASS  Tests\Visual\ParallelNestedDatasets
   ✓ parallel loads nested datasets from nested directories
@@ -2321,4 +2323,4 @@
   ✓ pass with dataset with ('my-datas-set-value')
   ✓ within describe → pass with dataset with ('my-datas-set-value')
 
-  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 37 skipped, 1648 passed (3649 assertions)
+  Tests:    2 deprecated, 4 warnings, 5 incomplete, 2 notices, 40 todos, 37 skipped, 1650 passed (3653 assertions)

tests/Fixtures/Suites/ParallelGroupFilteredLastFile/ATest.php

@@ -0,0 +1,5 @@
+<?php
+
+it('belongs to the filtered group', function () {
+    expect(true)->toBeTrue();
+})->group('filtered');

tests/Fixtures/Suites/ParallelGroupFilteredLastFile/ZTest.php

@@ -0,0 +1,5 @@
+<?php
+
+it('does not belong to the filtered group', function () {
+    expect(true)->toBeTrue();
+});

tests/Visual/Parallel.php

@@ -105,3 +105,29 @@
     '--do-not-cache-result',
     '--do-not-record-test-run-history',
 ])->skipOnWindows();
+
+test('parallel group-filtered run is not considered empty when a worker ends on a fully filtered file', function (): void {
+    $process = new Process(
+        ['php', 'bin/pest', '--parallel', '--processes=1', '--group=filtered', 'tests/Fixtures/Suites/ParallelGroupFilteredLastFile'],
+        dirname(__DIR__, 2),
+        ['COLLISION_PRINTER' => 'DefaultPrinter', 'COLLISION_IGNORE_DURATION' => 'true', 'PAO_DISABLE' => '1'],
+    );
+
+    $process->run();
+
+    expect(removeAnsiEscapeSequences($process->getOutput()))->toContain('Tests:    1 passed (1 assertions)')
+        ->and($process->getExitCode())->toBe(0);
+})->skipOnWindows();
+
+test('parallel group-filtered run still fails when the selection matches no tests', function (): void {
+    $process = new Process(
+        ['php', 'bin/pest', '--parallel', '--processes=3', '--group=missing', 'tests/Fixtures/Suites/ParallelGroupFilteredLastFile'],
+        dirname(__DIR__, 2),
+        ['COLLISION_PRINTER' => 'DefaultPrinter', 'COLLISION_IGNORE_DURATION' => 'true', 'PAO_DISABLE' => '1'],
+    );
+
+    $process->run();
+
+    expect(removeAnsiEscapeSequences($process->getOutput()))->toContain('No tests found.')
+        ->and($process->getExitCode())->toBe(1);
+})->skipOnWindows();