Merge pull request #858 from hippo91/fix_python39_new

Fix python39

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/unittest_inference.py b/tests/unittest_inference.py
index 23a131e4..c378258a 100644
--- a/tests/unittest_inference.py
+++ b/tests/unittest_inference.py
@@ -5655,6 +5655,10 @@ def test_custom_decorators_for_classmethod_and_staticmethods(code, obj, obj_type
 
 
 @pytest.mark.skipif(sys.version_info < (3, 8), reason="Needs dataclasses available")
+@pytest.mark.skipif(
+    sys.version_info >= (3, 9),
+    reason="Exact inference with dataclasses (replace function) in python3.9",
+)
 def test_dataclasses_subscript_inference_recursion_error():
     code = """
     from dataclasses import dataclass, replace
@@ -5675,6 +5679,31 @@ def test_dataclasses_subscript_inference_recursion_error():
     assert helpers.safe_infer(node) is None
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 9),
+    reason="Exact inference with dataclasses (replace function) in python3.9",
+)
+def test_dataclasses_subscript_inference_recursion_error_39():
+    code = """
+    from dataclasses import dataclass, replace
+
+    @dataclass
+    class ProxyConfig:
+        auth: str = "/auth"
+
+
+    a = ProxyConfig("")
+    test_dict = {"proxy" : {"auth" : "", "bla" : "f"}}
+
+    foo = test_dict['proxy']
+    replace(a, **test_dict['proxy']) # This fails
+    """
+    node = extract_node(code)
+    infer_val = helpers.safe_infer(node)
+    assert isinstance(infer_val, Instance)
+    assert infer_val.pytype() == ".ProxyConfig"
+
+
 def test_self_reference_infer_does_not_trigger_recursion_error():
     # Prevents https://github.com/PyCQA/pylint/issues/1285
     code = """