bump oxyevo tests

Author: esoteric-ephemera

tests/core/test_oxygen_evolution.py

@@ -1,5 +1,6 @@
 """Test the oxygen evolution analysis features in the client."""
 
+import json
 import pytest
 import numpy as np
 from scipy.interpolate import splev
@@ -8,7 +9,7 @@
 from pymatgen.core import Composition
 from pymatgen.entries.computed_entries import ComputedEntry
 
-from mp_api.client.core._oxygen_evolution import NIST_JANAF_O2_MU_T, OxygenEvolution
+from mp_api.client.core._oxygen_evolution import DEFAULT_CACHE_FILE, NIST_JANAF_O2_MU_T, OxygenEvolution
 
 
 def test_interp():
@@ -37,6 +38,20 @@ def test_interp():
         with pytest.warns(UserWarning, match="outside the fitting range"):
             oxyevo.mu_to_temp_spline(badval)
 
+def test_get():
+    """Test data retrieval from NIST."""
+
+    data = {}
+    data["temperature"], data["mu-mu_0K"] = OxygenEvolution().get_chempot_temp_data()
+    assert DEFAULT_CACHE_FILE.exists()
+    assert all(
+        np.allclose(data[k],v) for k, v in NIST_JANAF_O2_MU_T.items()
+    )
+    json_data = json.loads(DEFAULT_CACHE_FILE.read_text())
+    assert all(
+        np.allclose(json_data[k],v) for k, v in NIST_JANAF_O2_MU_T.items()
+    )
+
 
 def test_oxy_evo():
     """Very fake Al-O chemical system for testing purposes."""