added test for ensemble_boot_multiple

tests/test_ensemble_boot.py

@@ -1,5 +1,5 @@
 from easyvvuq.analysis.ensemble_boot import confidence_interval, bootstrap
-from easyvvuq.analysis.ensemble_boot import ensemble_bootstrap, EnsembleBoot
+from easyvvuq.analysis.ensemble_boot import ensemble_bootstrap, EnsembleBoot, EnsembleBootMultiple
 import os
 import numpy as np
 import pandas as pd
@@ -82,3 +82,19 @@ def test_ensemble_boot():
         'b': ['group1'] * VALUES.shape[0] + ['group2'] * VALUES.shape[0]})
     results = analysis.analyse(df)
     assert (not results.empty)
+
+def test_ensemble_boot_multiple():
+    analysis = EnsembleBootMultiple()
+    assert (analysis.element_name() == 'ensemble_boot_multiple')
+    assert (analysis.element_version() == '0.1')
+    with pytest.raises(RuntimeError):
+        analysis.analyse()
+    with pytest.raises(RuntimeError):
+        analysis.analyse(pd.DataFrame({}))
+    analysis = EnsembleBootMultiple(groupby=['b'], qoi_cols=['a'], stat_func=[np.mean, np.var, np.median])
+    df = pd.DataFrame({
+        'a': np.concatenate((VALUES, VALUES)),
+        'b': ['group1'] * VALUES.shape[0] + ['group2'] * VALUES.shape[0]})
+    results = analysis.analyse(df)
+    assert (not results.empty)
+    assert (results.values.shape == (2, 9))