Estimators should be sorted by file names (#782)

* sort list_of_matching_files

* add test

* convertfrompattern sort files

pymchelper/input_output.py

@@ -189,7 +189,7 @@ def frompattern(pattern: str, error: ErrorEstimate = ErrorEstimate.stderr, nan:
     """
 
     try:
-        list_of_matching_files = glob(pattern)
+        list_of_matching_files = sorted(glob(pattern))
     except TypeError as e:  # noqa: F841
         list_of_matching_files = pattern
 
@@ -249,7 +249,7 @@ def convertfrompattern(pattern, outputdir, converter_name, options, error=ErrorE
     :param nan: if True, NaN (not a number) are excluded when averaging data.
     :return:
     """
-    list_of_matching_files = glob(pattern)
+    list_of_matching_files = sorted(glob(pattern))
 
     core_names_dict = group_input_files(list_of_matching_files)
 

tests/test_frompattern.py

@@ -0,0 +1,15 @@
+import pytest
+from pymchelper.input_output import frompattern
+
+
+@pytest.fixture
+def shieldhit_pattern() -> str:
+    """Fixture for SHIELD-HIT file pattern"""
+    return "tests/res/shieldhit/generated/many/msh/aen_*.bdo"
+
+
+def test_estimators_are_sorted_by_names(shieldhit_pattern: str) -> None:
+    """Test if frompattern returns estimators sorted by name"""
+    averaged_estimators = frompattern(pattern=shieldhit_pattern)
+    estimator_names = [estimator.file_corename for estimator in averaged_estimators]
+    assert estimator_names == sorted(estimator_names), "Estimators are not sorted by file names"