[10.x] Adds Countable to the InvokedProcessPool class.

src/Illuminate/Process/InvokedProcessPool.php

@@ -2,7 +2,9 @@
 
 namespace Illuminate\Process;
 
-class InvokedProcessPool
+use Countable;
+
+class InvokedProcessPool implements Countable
 {
     /**
      * The array of invoked processes.
@@ -52,4 +54,14 @@ public function wait()
     {
         return new ProcessPoolResults(collect($this->invokedProcesses)->map->wait()->all());
     }
+
+    /**
+     * Get the total number of processes.
+     *
+     * @return int
+     */
+    public function count(): int
+    {
+        return count($this->invokedProcesses);
+    }
 }

tests/Process/ProcessTest.php

@@ -54,6 +54,20 @@ public function testProcessPool()
         $this->assertTrue(str_contains($results[1]->output(), 'ProcessTest.php'));
     }
 
+    public function testInvokedProcessPoolCount()
+    {
+        $factory = new Factory;
+
+        $pool = $factory->pool(function ($pool) {
+            return [
+                $pool->path(__DIR__)->command($this->ls()),
+                $pool->path(__DIR__)->command($this->ls()),
+            ];
+        })->start();
+
+        $this->assertCount(2, $pool);
+    }
+
     public function testProcessPoolCanReceiveOutputForEachProcessViaStartMethod()
     {
         $factory = new Factory;