added failing test for clone

pprett · GaelVaroquaux · commit 03d28eec29ee · 2012-10-06T15:48:59.000+02:00
diff --git a/sklearn/linear_model/tests/test_sgd.py b/sklearn/linear_model/tests/test_sgd.py
@@ -8,6 +8,7 @@
 from sklearn import preprocessing
 from sklearn.linear_model import SGDClassifier, SGDRegressor
 from sklearn.utils.testing import assert_greater, assert_less
+from sklearn.base import clone
 
 import unittest
 from nose.tools import raises
@@ -152,6 +153,18 @@ def test_input_format(self):
         Y_ = np.c_[Y_, Y_]
         assert_raises(ValueError, clf.fit, X, Y_)
 
+    def test_clone(self):
+        """Test whether clone works ok. """
+        clf = self.factory(alpha=0.01, n_iter=5, penalty='l1')
+        clf = clone(clf)
+        clf.set_params(penalty='l2')
+        clf.fit(X, Y)
+
+        clf2 = self.factory(alpha=0.01, n_iter=5, penalty='l2')
+        clf2.fit(X, Y)
+
+        assert_array_equal(clf.coef_, clf2.coef_)
+
 
 class DenseSGDClassifierTestCase(unittest.TestCase, CommonTest):
     """Test suite for the dense representation variant of SGD"""
