Test to ensure Issue #44 is fixed

Author: josesho

dabest/tests/test_02_edge_cases.py

@@ -0,0 +1,43 @@
+#!/usr/bin/python
+# -*-coding: utf-8 -*-
+# Author: Joses Ho
+# Email : joseshowh@gmail.com
+
+
+import sys
+import numpy as np
+import scipy as sp
+import pytest
+import pandas as pd
+from .._api import load
+
+
+
+def test_unrelated_columns(N=60, random_seed=12345):
+    """
+    Test to see if 'unrelated' columns jam up the analysis.
+    See Github Issue 43.
+    https://github.com/ACCLAB/DABEST-python/issues/44.
+    
+    Added in v0.2.5.
+    """
+
+    np.random.seed(random_seed)
+
+    df = pd.DataFrame(
+        {'groups': np.random.choice(['Group 1', 'Group 2', 'Group 3'], size=(N,)),
+         'color' : np.random.choice(['green', 'red', 'purple'], size=(N,)),
+         'value': np.random.random(size=(N,))})
+
+    np.random.seed()
+
+    df['unrelated'] = np.nan
+
+    test = load(data=df, x='groups', y='value', 
+                idx=['Group 1', 'Group 2'])
+    
+    md = test.mean_diff.results
+    
+    assert md.difference[0] == pytest.approx(0.1115, abs=1e-6)
+    assert md.bca_low[0]    == pytest.approx(-0.042835, abs=1e-6)
+    assert md.bca_high[0]   == pytest.approx(0.264542, abs=1e-6)