gh-101229: Add tests for aliases of imported names (GH-101230)

(cherry picked from commit 28db978)

Co-authored-by: Eclips4 <[email protected]>

Author: miss-islington

Lib/test/test_ast.py

@@ -407,6 +407,24 @@ def test_alias(self):
         self.assertEqual(alias.col_offset, 16)
         self.assertEqual(alias.end_col_offset, 17)
 
+        im = ast.parse("from bar import y as z").body[0]
+        alias = im.names[0]
+        self.assertEqual(alias.name, "y")
+        self.assertEqual(alias.asname, "z")
+        self.assertEqual(alias.lineno, 1)
+        self.assertEqual(alias.end_lineno, 1)
+        self.assertEqual(alias.col_offset, 16)
+        self.assertEqual(alias.end_col_offset, 22)
+
+        im = ast.parse("import bar as foo").body[0]
+        alias = im.names[0]
+        self.assertEqual(alias.name, "bar")
+        self.assertEqual(alias.asname, "foo")
+        self.assertEqual(alias.lineno, 1)
+        self.assertEqual(alias.end_lineno, 1)
+        self.assertEqual(alias.col_offset, 7)
+        self.assertEqual(alias.end_col_offset, 17)
+
     def test_base_classes(self):
         self.assertTrue(issubclass(ast.For, ast.stmt))
         self.assertTrue(issubclass(ast.Name, ast.expr))