payed off testing technical debt + bug fixes + traces based evaluator

stl/test_load.py

@@ -0,0 +1,20 @@
+import pandas as pd
+
+from stl.load import from_pandas
+
+DATA = pd.DataFrame(
+    data={
+        'AP1': [True, False, True],
+        'x': [0, 0, 0.1],
+        'y': [-1, -1, 0],
+        'z': [2, 3, 1],
+    },
+    index=[0, 1, 2],
+)
+
+
+def test_from_pandas():
+    x = from_pandas(DATA)
+    assert x['x'][0] == 0
+    assert x['x'][0.2] == 0
+    assert not x['AP1'][1.4]