add test_hf_checkpointer.py but remove references to MPT

tests/callbacks/test_hf_checkpointer.py

@@ -0,0 +1,85 @@
+# Copyright 2022 MosaicML LLM Foundry authors
+# SPDX-License-Identifier: Apache-2.0
+
+from typing import Any, Callable, List
+from unittest.mock import patch
+
+from composer.core import State, Time, TimeUnit
+from composer.devices import DeviceCPU
+from composer.loggers import Logger
+
+from llmfoundry.callbacks.hf_checkpointer import HuggingFaceCheckpointer
+
+dummy_s3_path = 's3://dummy/path'
+dummy_oci_path = 'oci://dummypath'
+dummy_gc_path = 'gs://dummy/path'
+dummy_uc_path = 'dbfs://dummypath/Volumes/the_catalog/the_schema/yada_yada'
+
+dummy_save_interval = Time(1, TimeUnit.EPOCH)
+
+
+def dummy_log_info(log_output: List[str]):
+    def _dummy_log_info(*msgs: str):
+        log_output.extend(msgs)
+
+    return _dummy_log_info
+
+
+@patch(
+    'composer.loggers.remote_uploader_downloader.RemoteUploaderDownloader.upload_file',
+    lambda *_, **__: None)
+def assert_checkpoint_saves_to_uri(uri: str, build_tiny_hf_mpt: Callable):
+    uri_base = uri.split('://')[0]
+    model = build_tiny_hf_mpt()
+
+    dummy_state = State(model=model,
+                        rank_zero_seed=42,
+                        run_name='dummy_run',
+                        device=DeviceCPU())
+    dummy_logger = Logger(dummy_state)
+    # mock the State and Logger
+    logs = []
+    with patch('logging.Logger.info', dummy_log_info(logs)):
+        my_checkpointer = HuggingFaceCheckpointer(
+            save_folder=uri, save_interval=dummy_save_interval)
+        my_checkpointer._save_checkpoint(dummy_state, dummy_logger)
+
+    assert any([uri_base in str(log) for log in logs])
+
+
+def test_checkpoint_saves_to_s3(build_tiny_hf_mpt: Callable):
+    assert_checkpoint_saves_to_uri(dummy_s3_path, build_tiny_hf_mpt)
+
+
+class DummyData:
+
+    def __init__(self, *_, **__: Any):
+        self.data = '🪐'
+        pass
+
+
+class DummyClient:
+
+    def __init__(self, *_, **__: Any):
+        pass
+
+    def get_namespace(self, *_, **__: Any):
+        return DummyData()
+
+
+def test_checkpoint_saves_to_oci(build_tiny_hf_mpt: Callable,
+                                 oci_temp_file: None):
+    with patch('oci.config.from_file', lambda _: {}), \
+         patch('oci.object_storage.ObjectStorageClient', lambda *_, **__: DummyClient()), \
+         patch('oci.object_storage.UploadManager', lambda *_, **__: None):
+        assert_checkpoint_saves_to_uri(dummy_oci_path, build_tiny_hf_mpt)
+
+
+def test_checkpoint_saves_to_gc(build_tiny_hf_mpt: Callable,
+                                gcs_account_credentials: None):
+    assert_checkpoint_saves_to_uri(dummy_gc_path, build_tiny_hf_mpt)
+
+
+def test_checkpoint_saves_to_uc(build_tiny_hf_mpt: Callable,
+                                uc_account_credentials: None):
+    assert_checkpoint_saves_to_uri(dummy_uc_path, build_tiny_hf_mpt)