added sleep to various tests to ensure file mtimes are different

pydra/engine/tests/test_node_task.py

@@ -3,6 +3,7 @@
 import attr
 import numpy as np
 import pytest
+import time
 
 from .utils import (
     fun_addtwo,
@@ -320,6 +321,7 @@ def test_task_init_7(tmp_path):
     output_dir1 = nn1.output_dir
 
     # changing the content of the file
+    time.sleep(2)  # need the mtime to be different
     file2 = tmp_path / "file2.txt"
     with open(file2, "w") as f:
         f.write("from pydra")

pydra/engine/tests/test_specs.py

@@ -3,6 +3,7 @@
 import os
 import attrs
 from copy import deepcopy
+import time
 
 from ..specs import (
     BaseSpec,
@@ -319,6 +320,7 @@ def test_input_file_hash_4(tmp_path):
     assert hash1 == hash2
 
     # checking if different content (the same name) affects the hash
+    time.sleep(2)  # need the mtime to be different
     file_diffcontent = tmp_path / "in_file_1.txt"
     with open(file_diffcontent, "w") as f:
         f.write("hi")

pydra/utils/tests/test_hash.py

@@ -1,6 +1,7 @@
 import re
 from hashlib import blake2b
 from pathlib import Path
+import time
 
 import attrs
 import pytest
@@ -318,6 +319,7 @@ def test_persistent_hash_cache(tmp_path):
     assert hash_object(text_file, persistent_cache=cache_path) == modified_hash
 
     # Test that changes to the text file result in new hash
+    time.sleep(2)  # Need to ensure that the mtimes will be different
     text_file_path.write_text("bar")
     assert hash_object(text_file, persistent_cache=cache_path) != modified_hash
     assert len(list(cache_path.iterdir())) == 2