chore: change--SubPath keyvalue, add assert Subpath in test

Author: Khushiyant

docker/types/services.py

@@ -283,7 +283,7 @@ def __init__(self, target, source, type='volume', read_only=False,
             if driver_config:
                 volume_opts['DriverConfig'] = driver_config
             if subpath:
-                volume_opts['SubPath'] = subpath
+                volume_opts['Subpath'] = subpath
             if volume_opts:
                 self['VolumeOptions'] = volume_opts
             if any([propagation, tmpfs_size, tmpfs_mode]):

tests/integration/api_container_test.py

@@ -638,10 +638,13 @@ def test_create_with_subpath_volume_mount(self):
             lambda x: x['Destination'] == self.mount_dest,
             inspect_data['Mounts']
         ))
+
+        print(mount)
         assert len(filtered) == 1
         mount_data = filtered[0]
         assert mount['Source'] == mount_data['Name']
         assert mount_data['RW'] is False
+        assert mount["VolumeOptions"]["Subpath"] == "subdir"
 
     def check_container_data(self, inspect_data, rw, propagation='rprivate'):
         assert 'Mounts' in inspect_data