Add sphinx.pycode.ast.parse() and unparse()

tests/test_pycode_ast.py

@@ -0,0 +1,40 @@
+"""
+    test_pycode_ast
+    ~~~~~~~~~~~~~~~
+
+    Test pycode.ast
+
+    :copyright: Copyright 2007-2016 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import pytest
+
+from sphinx.pycode import ast
+
+
+@pytest.mark.parametrize('source,expected', [
+    ("os.path", "os.path"),                     # Attribute
+    ("b'bytes'", "b'bytes'"),                   # Bytes
+    ("object()", "object()"),                   # Call
+    ("1234", "1234"),                           # Constant
+    ("{'key1': 'value1', 'key2': 'value2'}",
+     "{'key1': 'value1', 'key2': 'value2'}"),   # Dict
+    ("...", "..."),                             # Ellipsis
+    ("Tuple[int, int]", "Tuple[int, int]"),     # Index, Subscript
+    ("lambda x, y: x + y",
+     "<function <lambda>>"),                    # Lambda
+    ("[1, 2, 3]", "[1, 2, 3]"),                 # List
+    ("sys", "sys"),                             # Name, NameConstant
+    ("1234", "1234"),                           # Num
+    ("{1, 2, 3}", "{1, 2, 3}"),                 # Set
+    ("'str'", "'str'"),                         # Str
+    ("(1, 2, 3)", "1, 2, 3"),                   # Tuple
+])
+def test_unparse(source, expected):
+    module = ast.parse(source)
+    assert ast.unparse(module.body[0].value) == expected
+
+
+def test_unparse_None():
+    assert ast.unparse(None) is None