Test the life cycle of a storage file

tests/test_feedexport.py

@@ -1517,6 +1517,61 @@ class FeedExportTest(FeedExportTestBase):
             data = yield self.exported_data(items, settings)
             self.assertEqual(row['expected'], data[feed_options['format']])
 
+    @defer.inlineCallbacks
+    def test_storage_file_no_postprocessing(self):
+
+        @implementer(IFeedStorage)
+        class Storage:
+
+            def __init__(self, uri, *, feed_options=None):
+                pass
+
+            def open(self, spider):
+                Storage.open_file = tempfile.NamedTemporaryFile(prefix='feed-')
+                return Storage.open_file
+
+            def store(self, file):
+                Storage.store_file = file
+                file.close()
+
+        settings = {
+            'FEEDS': {self._random_temp_filename(): {'format': 'jsonlines'}},
+            'FEED_STORAGES': {'file': Storage},
+        }
+        yield self.exported_no_data(settings)
+        self.assertIs(Storage.open_file, Storage.store_file)
+
+    @defer.inlineCallbacks
+    def test_storage_file_postprocessing(self):
+
+        @implementer(IFeedStorage)
+        class Storage:
+
+            def __init__(self, uri, *, feed_options=None):
+                pass
+
+            def open(self, spider):
+                Storage.open_file = tempfile.NamedTemporaryFile(prefix='feed-')
+                return Storage.open_file
+
+            def store(self, file):
+                Storage.store_file = file
+                file.close()
+
+        settings = {
+            'FEEDS': {
+                self._random_temp_filename(): {
+                    'format': 'jsonlines',
+                    'postprocessing': [
+                        'scrapy.extensions.postprocessing.GzipPlugin',
+                    ],
+                },
+            },
+            'FEED_STORAGES': {'file': Storage},
+        }
+        yield self.exported_no_data(settings)
+        self.assertIs(Storage.open_file, Storage.store_file)
+
 
 class FeedPostProcessedExportsTest(FeedExportTestBase):
     __test__ = True