Add fixture for assertDictContainsSubset.

Thanks to Ryan T. Dean for providing the idea.
Closes #22.

tests/fixtures/self_assert/assertDictContainsSubset_in.py

@@ -0,0 +1,21 @@
+# required-method: assertDictContainsSubset
+
+class TestDictEqual(TestCase):
+    def test_simple(self):
+        self.assertDictContainsSubset({'a: 1'}, superset)
+
+    def test_simple_msg(self):
+        self.assertDictContainsSubset(subset, {'a: 1'}, msg="This is wrong!")
+
+    def test_simple_msg2(self):
+        self.assertDictContainsSubset(subset, {'a: 1'}, "This is wrong!")
+
+    def test_line_wrapping(self):
+        self.assertDictContainsSubset(
+            {'b': 2},
+            {
+                'a': 1,
+                'b': 2,
+            },
+            "This is wrong!",
+        )

tests/fixtures/self_assert/assertDictContainsSubset_out.py

@@ -0,0 +1,21 @@
+# required-method: assertDictContainsSubset
+
+class TestDictEqual(TestCase):
+    def test_simple(self):
+        assert dict({'a: 1'}, **superset) == superset
+
+    def test_simple_msg(self):
+        assert dict(subset, **{'a: 1'}) == {'a: 1'}, "This is wrong!"
+
+    def test_simple_msg2(self):
+        assert dict(subset, **{'a: 1'}) == {'a: 1'}, "This is wrong!"
+
+    def test_line_wrapping(self):
+        assert dict({'b': 2}, **{
+                'a': 1,
+                'b': 2,
+            }) == {
+                'a': 1,
+                'b': 2,
+            }, \
+            "This is wrong!"

unittest2pytest/fixes/fix_self_assert.py

@@ -88,7 +88,7 @@ def fill_template(template, *args):
             p.prefix = ''
         else:
             p = Name(p)
-        kids.append(p)
+        kids.append(p.clone())
     return kids
 
 def DualOp(template, first, second, kws):
@@ -273,8 +273,8 @@ def get_import_nodes(node):
     'assertTupleEqual':     partial(CompOp, '=='),
     'assertSequenceEqual':  SequenceEqual,
 
+    'assertDictContainsSubset': partial(DualOp, 'dict(\1, **\2) == \2'),
     # :todo:
-    #'assertDictContainsSubset': '',
     #'assertItemsEqual': '', # unordered sequence specific comparison.
 
     'assertAlmostEqual':    partial(AlmostOp, "==", "<"),