[10.x] Add Conditionable to Pipeline (#49429)

* [10.x] Add Conditionable to Pipeline

* fix test

Author: shane-zeng

src/Illuminate/Pipeline/Pipeline.php

@@ -5,11 +5,14 @@
 use Closure;
 use Illuminate\Contracts\Container\Container;
 use Illuminate\Contracts\Pipeline\Pipeline as PipelineContract;
+use Illuminate\Support\Traits\Conditionable;
 use RuntimeException;
 use Throwable;
 
 class Pipeline implements PipelineContract
 {
+    use Conditionable;
+
     /**
      * The container implementation.
      *

tests/Pipeline/PipelineTest.php

@@ -243,6 +243,36 @@ public function testPipelineThenReturnMethodRunsPipelineThenReturnsPassable()
 
         unset($_SERVER['__test.pipe.one']);
     }
+
+    public function testPipelineConditionable()
+    {
+        $result = (new Pipeline(new Container))
+            ->send('foo')
+            ->when(true, function (Pipeline $pipeline) {
+                $pipeline->pipe([PipelineTestPipeOne::class]);
+            })
+            ->then(function ($piped) {
+                return $piped;
+            });
+
+        $this->assertSame('foo', $result);
+        $this->assertSame('foo', $_SERVER['__test.pipe.one']);
+        unset($_SERVER['__test.pipe.one']);
+
+        $_SERVER['__test.pipe.one'] = null;
+        $result = (new Pipeline(new Container))
+            ->send('foo')
+            ->when(false, function (Pipeline $pipeline) {
+                $pipeline->pipe([PipelineTestPipeOne::class]);
+            })
+            ->then(function ($piped) {
+                return $piped;
+            });
+
+        $this->assertSame('foo', $result);
+        $this->assertNull($_SERVER['__test.pipe.one']);
+        unset($_SERVER['__test.pipe.one']);
+    }
 }
 
 class PipelineTestPipeOne