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

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

@@ -56,3 +56,28 @@
         ->toContain('Tests:    2 passed (2 assertions)')
         ->toContain('Parallel: 3 processes');
 })->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'],
+    );
+
+    $process->run();
+
+    expect($process->getExitCode())->not->toBe(0);
+})->skipOnWindows();