Add regression test for #59

Author: chrisburr

tests/test.py

@@ -230,6 +230,18 @@ def test_nonscalar_columns():
     os.remove(path)
 
 
+def test_get_matching_variables_performance():
+    """Performance regression test for #59"""
+    import random
+    import string
+    import root_pandas.readwrite
+    for n in [10, 100, 1000, 10000, 100000]:
+        branches = [' '.join(random.choices(string.ascii_letters, k=100)) for i in range(n)]
+        patterns = [' '.join(random.choices(string.ascii_letters, k=100)) for i in range(n)]
+        root_pandas.readwrite.get_matching_variables(branches, patterns, fail=False)
+        root_pandas.readwrite.get_matching_variables(branches, branches, fail=False)
+
+
 def test_noexpand_prefix():
     xs = np.array([1, 2, 3])
     df = pd.DataFrame({'x': xs})