TST: add pickle and txt io tests

tests/test_all.py

@@ -13,6 +13,7 @@
 import pandas as pd
 import numpy as np
 import pytest
+import joblib
 
 import psweep as ps
 
@@ -885,3 +886,20 @@ def test_run_local_deprecated():
     params = ps.plist("a", [1, 2, 3])
     with pytest.deprecated_call():
         ps.run_local(func_a, params, save=False)
+
+
+def test_pickle_io():
+    obj = dict(a=1, b=_Foo(), c=np.sin)
+    hsh = lambda obj: joblib.hash(obj, hash_name="sha1")
+    with tempfile.TemporaryDirectory() as tmpdir:
+        fn = f"{tmpdir}/path/that/has/to/be/created/file.pk"
+        ps.pickle_write(fn, obj)
+        assert hsh(obj) == hsh(ps.pickle_read(fn))
+
+
+def test_file_io():
+    txt = "some random text"
+    with tempfile.TemporaryDirectory() as tmpdir:
+        fn = f"{tmpdir}/path/that/has/to/be/created/file.txt"
+        ps.file_write(fn, txt)
+        assert txt == ps.file_read(fn)