Add extra tests for __future__ annotations

tests/test_transformer.py

@@ -1834,6 +1834,39 @@ def foo() -> int:
     )
 
 
+def test_respect_future_import_carriage_return() -> None:
+    # Regression test for #385
+    node = parse(
+        dedent(
+            '''
+            """module docstring"""
+
+            from __future__ import annotations
+
+            def foo() -> int:
+                return 1
+            '''
+        )
+    )
+    TypeguardTransformer().visit(node)
+    assert (
+        unparse(node)
+        == dedent(
+            '''
+            """module docstring"""
+
+            from __future__ import annotations
+            from typeguard import TypeCheckMemo
+            from typeguard._functions import check_return_type
+
+            def foo() -> int:
+                memo = TypeCheckMemo(globals(), locals())
+                return check_return_type('foo', 1, int, memo)
+            '''
+        ).strip()
+    )
+
+
 def test_literal() -> None:
     # Regression test for #399
     node = parse(