Decouple ``FunctionDef`` and ``Lambda`` (#2115)

As discussed in #2112 we really need to decouple this nodes.

1 files changed, 33 insertions, 0 deletions

diff --git a/tests/test_scoped_nodes.py b/tests/test_scoped_nodes.py
index 1a6b8d15..d3a890ab 100644
--- a/tests/test_scoped_nodes.py
+++ b/tests/test_scoped_nodes.py
@@ -930,6 +930,39 @@ class FunctionNodeTest(ModuleLoader, unittest.TestCase):
         func: nodes.FunctionDef = builder.extract_node(code)  # type: ignore[assignment]
         assert func.doc_node is None
 
+    @staticmethod
+    def test_display_type() -> None:
+        code = textwrap.dedent(
+            """\
+            def foo():
+                bar = 1
+        """
+        )
+        func: nodes.FunctionDef = builder.extract_node(code)  # type: ignore[assignment]
+        assert func.display_type() == "Function"
+
+        code = textwrap.dedent(
+            """\
+            class A:
+                def foo(self):  #@
+                    bar = 1
+        """
+        )
+        func: nodes.FunctionDef = builder.extract_node(code)  # type: ignore[assignment]
+        assert func.display_type() == "Method"
+
+    @staticmethod
+    def test_inference_error() -> None:
+        code = textwrap.dedent(
+            """\
+            def foo():
+                bar = 1
+        """
+        )
+        func: nodes.FunctionDef = builder.extract_node(code)  # type: ignore[assignment]
+        with pytest.raises(AttributeInferenceError):
+            func.getattr("")
+
 
 class ClassNodeTest(ModuleLoader, unittest.TestCase):
     def test_dict_interface(self) -> None: