Await pending writes before closing

src/Internal/QueuedWritesFile.php

@@ -70,7 +70,16 @@ abstract class QueuedWritesFile implements File
     public function end(): void
     {
         $this->writable = false;
-        $this->close();
+
+        if ($this->queue->isEmpty()) {
+            $this->close();
+            return;
+        }
+
+        $future = $this->queue->top()->finally($this->close(...));
+        $this->queue->push($future);
+
+        $future->await();
     }
 
     /**

test/FileTest.php

@@ -4,6 +4,7 @@ namespace Amp\File\Test;
 
 use Amp\ByteStream\ClosedException;
 use Amp\File;
+use function Amp\async;
 
 abstract class FileTest extends FilesystemTest
 {
@@ -204,6 +205,22 @@ abstract class FileTest extends FilesystemTest
         $handle->read();
     }
 
+    public function testCloseWithPendingWrites(): void
+    {
+        $path = Fixture::path() . "/write";
+
+        $handle = $this->driver->openFile($path, "c+");
+
+        $data = "data";
+        $writeFuture = async($handle->write(...), $data);
+        $closeFuture = async($handle->close(...));
+
+        $writeFuture->await();
+        $closeFuture->await();
+
+        $this->assertSame($data, $this->driver->read($path));
+    }
+
     /**
      * @depends testWrite
      */