fix tests in py3.7

Author: Teque5

tests/test_collection.py

@@ -57,15 +57,15 @@ def test_load_collection(self, subdir: str) -> None:
         metadata = copy.deepcopy(TEST_METADATA)
         meta1 = SigMFFile(metadata=metadata, data_file=data_path1)
         meta2 = SigMFFile(metadata=metadata, data_file=data_path2)
-        meta1.tofile(meta_path1)
-        meta2.tofile(meta_path2)
+        meta1.tofile(meta_path1, overwrite=True)
+        meta2.tofile(meta_path2, overwrite=True)
 
         # create collection
         collection = SigMFCollection(
             metafiles=[meta_name1, meta_name2],
             base_path=str(self.temp_dir / subdir),
         )
-        collection.tofile(collection_path)
+        collection.tofile(collection_path, overwrite=True)
 
         # load collection
         collection_loopback = fromfile(collection_path)

tests/test_ncd.py

@@ -46,7 +46,7 @@ def test_load_ncd(self, subdir: str) -> None:
         # create metadata file
         ncd_metadata = copy.deepcopy(TEST_METADATA)
         meta = SigMFFile(metadata=ncd_metadata, data_file=data_path)
-        meta.tofile(meta_path)
+        meta.tofile(meta_path, overwrite=True)
 
         # load dataset & validate we can read all the data
         meta_loopback = fromfile(meta_path)