Add tests for HyDict methods

tests/models/test_dict.py

@@ -0,0 +1,13 @@
+from hy.models.dict import HyDict
+
+
+hydict = HyDict(["a", 1, "b", 2, "c", 3])
+
+def test_dict_items():
+    assert hydict.items() == [("a", 1), ("b", 2), ("c", 3)]
+
+def test_dict_keys():
+    assert hydict.keys() == ["a", "b", "c"]
+
+def test_dict_values():
+    assert hydict.values() == [1, 2, 3]