Add successful and failed

src/Illuminate/Process/ProcessPoolResults.php

@@ -3,6 +3,7 @@
 namespace Illuminate\Process;
 
 use ArrayAccess;
+use Illuminate\Process\Exceptions\ProcessFailedException;
 use Illuminate\Support\Collection;
 
 class ProcessPoolResults implements ArrayAccess
@@ -79,4 +80,22 @@ public function offsetUnset($offset): void
     {
         unset($this->results[$offset]);
     }
+
+    /**
+     * Determine if the process was successful.
+     *
+     * @return bool
+     */
+    public function successful() {
+        return collect($this->results)->every(fn($poolResult) => $poolResult->successful());
+    }
+
+    /**
+     * Determine if the process failed.
+     *
+     * @return bool
+     */
+    public function failed() {
+        return !$this->successful();
+    }
 }

tests/Process/ProcessTest.php

@@ -47,6 +47,31 @@ public function testProcessPool()
 
         $this->assertTrue(str_contains($results[0]->output(), 'ProcessTest.php'));
         $this->assertTrue(str_contains($results[1]->output(), 'ProcessTest.php'));
+
+        $this->assertTrue($results->successful());
+    }
+
+    public function testProcessPoolFailed()
+    {
+        $factory = new Factory;
+
+        $factory->fake([
+            'cat *' => $factory->result(exitCode: 1),
+        ]);
+
+        $pool = $factory->pool(function ($pool) {
+            return [
+                $pool->path(__DIR__)->command($this->ls()),
+                $pool->path(__DIR__)->command('cat test'),
+            ];
+        });
+
+        $results = $pool->start()->wait();
+
+        $this->assertTrue($results[0]->successful());
+        $this->assertTrue($results[1]->failed());
+
+        $this->assertTrue($results->failed());
     }
 
     public function testInvokedProcessPoolCount()