add checking for pep file type and simple test

looper/utils.py

@@ -598,6 +598,21 @@ def dotfile_path(directory=os.getcwd(), must_exist=False):
         cur_dir = parent_dir
 
 
+def is_PEP_file_type(input_string: str) -> bool:
+    """
+    Determines if the provided path is actually a file type that Looper can use for loading PEP
+    """
+
+    PEP_FILE_TYPES = ["yaml", "csv"]
+
+    parsed_path = parse_registry_path(input_string)
+
+    if parsed_path["subitem"] in PEP_FILE_TYPES:
+        return True
+    else:
+        return False
+
+
 def is_registry_path(input_string: str) -> bool:
     """
     Check if input is a registry path to pephub

tests/smoketests/test_run.py

@@ -34,6 +34,15 @@ def test_running_csv_pep(prep_temp_pep_csv):
         raise pytest.fail("DID RAISE {0}".format(Exception))
 
 
+@pytest.mark.parametrize(
+    "path", ["something/example.yaml", "somethingelse/example2.csv"]
+)
+def test_is_PEP_file_type(path):
+
+    result = is_PEP_file_type(path)
+    assert result == True
+
+
 def is_connected():
     """Determines if local machine can connect to the internet."""
     import socket