bpo-37950: Fix ast.dump() when call with incompletely initialized node. (GH-15510)

1 files changed, 29 insertions, 0 deletions

diff --git a/Lib/test/test_ast.py b/Lib/test/test_ast.py
index 3d12397..07bbb4c 100644
--- a/Lib/test/test_ast.py
+++ b/Lib/test/test_ast.py
@@ -645,6 +645,35 @@ class ASTHelpers_Test(unittest.TestCase):
             "lineno=1, col_offset=0, end_lineno=1, end_col_offset=24)], type_ignores=[])"
         )
 
+    def test_dump_incomplete(self):
+        node = ast.Raise(lineno=3, col_offset=4)
+        self.assertEqual(ast.dump(node),
+            "Raise()"
+        )
+        self.assertEqual(ast.dump(node, include_attributes=True),
+            "Raise(lineno=3, col_offset=4)"
+        )
+        node = ast.Raise(exc=ast.Name(id='e', ctx=ast.Load()), lineno=3, col_offset=4)
+        self.assertEqual(ast.dump(node),
+            "Raise(exc=Name(id='e', ctx=Load()))"
+        )
+        self.assertEqual(ast.dump(node, annotate_fields=False),
+            "Raise(Name('e', Load()))"
+        )
+        self.assertEqual(ast.dump(node, include_attributes=True),
+            "Raise(exc=Name(id='e', ctx=Load()), lineno=3, col_offset=4)"
+        )
+        self.assertEqual(ast.dump(node, annotate_fields=False, include_attributes=True),
+            "Raise(Name('e', Load()), lineno=3, col_offset=4)"
+        )
+        node = ast.Raise(cause=ast.Name(id='e', ctx=ast.Load()))
+        self.assertEqual(ast.dump(node),
+            "Raise(cause=Name(id='e', ctx=Load()))"
+        )
+        self.assertEqual(ast.dump(node, annotate_fields=False),
+            "Raise(cause=Name('e', Load()))"
+        )
+
     def test_copy_location(self):
         src = ast.parse('1 + 1', mode='eval')
         src.body.right = ast.copy_location(ast.Num(2), src.body.right)