Resolve "Minimal sample size in train-, val, test-set"

Closes #76 (closed)

test/test_modules/test_pre_processing.py

@@ -54,7 +54,7 @@ class TestPreProcessing:
         assert obj_with_exp_setup.data_store.search_name("generator") == []
         obj_with_exp_setup.split_train_val_test()
         data_store = obj_with_exp_setup.data_store
-        expected_params = ["generator", "start", "end", "stations", "permute_data"]
+        expected_params = ["generator", "start", "end", "stations", "permute_data", "min_length"]
         assert data_store.search_scope("general.train") == sorted(expected_params)
         assert data_store.search_name("generator") == sorted(["general.train", "general.val", "general.test",
                                                               "general.train_val"])