Added explicit test for writing using a stream-wrapper.

composer.json

@@ -35,7 +35,8 @@
         "google/cloud-storage": "^1.23",
         "async-aws/s3": "^1.5 || ^2.0",
         "async-aws/simple-s3": "^1.1 || ^2.0",
-        "sabre/dav": "^4.6.0"
+        "sabre/dav": "^4.6.0",
+        "guzzlehttp/psr7": "^2.6"
     },
     "conflict": {
         "async-aws/core": "<1.19.0",

src/FilesystemTest.php

@@ -7,6 +7,8 @@
 use DateTimeImmutable;
 use DateTimeInterface;
 use Generator;
+use GuzzleHttp\Psr7\StreamWrapper;
+use GuzzleHttp\Psr7\Utils;
 use IteratorAggregate;
 use League\Flysystem\InMemory\InMemoryFilesystemAdapter;
 use League\Flysystem\Local\LocalFilesystemAdapter;
@@ -98,6 +100,21 @@ public function writing_and_reading_a_stream(): void
         fclose($readStream);
     }
 
+    /**
+     * @test
+     */
+    public function writing_using_a_stream_wrapper(): void
+    {
+        $contents = 'contents of the file';
+        $stream = Utils::streamFor($contents);
+        $resource = StreamWrapper::getResource($stream);
+
+        $this->filesystem->writeStream('from-stream-wrapper.txt', $resource);
+        fclose($resource);
+
+        $this->assertEquals($contents, $this->filesystem->read('from-stream-wrapper.txt'));
+    }
+
     /**
      * @test
      */