Fix tests

tests/unit/test_pyam_compat.py

@@ -1,6 +1,7 @@
 import re
 from unittest import mock
 
+import pandas as pd
 import pytest
 
 from scmdata.pyam_compat import LongDatetimeIamDataFrame
@@ -13,9 +14,18 @@ def test_to_int_value_error(test_iam_df):
     postion = 4
     idf.loc[postion, "time"] = bad_val
 
-    error_msg = re.escape(
-        f"Unknown string format: {bad_val} present at position {postion}"
-    )
+    if pd.__version__.startswith("1"):
+        error_msg = re.escape(
+            f"Unknown string format: {bad_val} present at position {postion}"
+        )
+
+    else:
+        error_msg = re.escape(
+            f'time data "{bad_val}" '
+            "doesn't match format "
+            '"%Y/%m/%d", at position 4. You might want to try:'
+        )
+
     with pytest.raises(ValueError, match=error_msg):
         LongDatetimeIamDataFrame(idf)