1 files changed, 32 insertions, 9 deletions
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index f5a5c03..ee3ba6a 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -369,16 +369,17 @@ class BuiltinTest(unittest.TestCase):
                   (1, False, 'doc', False, False),
                   (2, False, None, False, False)]
         for optval, *expected in values:
+            with self.subTest(optval=optval):
             # test both direct compilation and compilation via AST
-            codeobjs = []
-            codeobjs.append(compile(codestr, "<test>", "exec", optimize=optval))
-            tree = ast.parse(codestr)
-            codeobjs.append(compile(tree, "<test>", "exec", optimize=optval))
-            for code in codeobjs:
-                ns = {}
-                exec(code, ns)
-                rv = ns['f']()
-                self.assertEqual(rv, tuple(expected))
+                codeobjs = []
+                codeobjs.append(compile(codestr, "<test>", "exec", optimize=optval))
+                tree = ast.parse(codestr)
+                codeobjs.append(compile(tree, "<test>", "exec", optimize=optval))
+                for code in codeobjs:
+                    ns = {}
+                    exec(code, ns)
+                    rv = ns['f']()
+                    self.assertEqual(rv, tuple(expected))
 
     def test_compile_top_level_await_no_coro(self):
         """Make sure top level non-await codes get the correct coroutine flags"""
@@ -517,6 +518,28 @@ class BuiltinTest(unittest.TestCase):
         exec(co, glob)
         self.assertEqual(type(glob['ticker']()), AsyncGeneratorType)
 
+    def test_compile_ast(self):
+        args = ("a*(1+2)", "f.py", "exec")
+        raw = compile(*args, flags = ast.PyCF_ONLY_AST).body[0]
+        opt = compile(*args, flags = ast.PyCF_OPTIMIZED_AST).body[0]
+
+        for tree in (raw, opt):
+            self.assertIsInstance(tree.value, ast.BinOp)
+            self.assertIsInstance(tree.value.op, ast.Mult)
+            self.assertIsInstance(tree.value.left, ast.Name)
+            self.assertEqual(tree.value.left.id, 'a')
+
+        raw_right = raw.value.right  # expect BinOp(1, '+', 2)
+        self.assertIsInstance(raw_right, ast.BinOp)
+        self.assertIsInstance(raw_right.left, ast.Constant)
+        self.assertEqual(raw_right.left.value, 1)
+        self.assertIsInstance(raw_right.right, ast.Constant)
+        self.assertEqual(raw_right.right.value, 2)
+
+        opt_right = opt.value.right  # expect Constant(3)
+        self.assertIsInstance(opt_right, ast.Constant)
+        self.assertEqual(opt_right.value, 3)
+
     def test_delattr(self):
         sys.spam = 1
         delattr(sys, 'spam')