Refactor is_lambda into helper module with tests

Author: Евгений Блинов

getsources/hash.py

@@ -1,17 +1,13 @@
 import hashlib
 from typing import Any, Callable
 from ast import parse, Expr, Constant, Lambda, get_source_segment, walk
-from types import FunctionType
 
 from getsources import getclearsource
+from getsources.helpers.is_lambda import is_lambda
 
 ALPHABET = '0123456789ABCDEFGHJKMNPQRSTVWXYZ'
 
 
-def is_lambda(function: Callable[..., Any]):
-    return isinstance(function, FunctionType) and function.__name__ == "<lambda>"
-
-
 def get_body_text(function: Callable[..., Any], source: str, skip_docstring: bool) -> str:
     tree = parse(source)
 

getsources/helpers/__init__.py

@@ -0,0 +1,6 @@
+from types import FunctionType
+from typing import Any, Callable
+
+
+def is_lambda(function: Callable[..., Any]):
+    return isinstance(function, FunctionType) and function.__name__ == "<lambda>"

getsources/helpers/is_lambda.py

@@ -0,0 +1,15 @@
+from getsources.helpers.is_lambda import is_lambda
+
+
+def test_lambdas_are_lambdas():
+    assert is_lambda(lambda x: x)
+    assert is_lambda(lambda x: None)
+    assert is_lambda(lambda: None)
+
+
+def test_are_not_lambdas(transformed):
+    @transformed
+    def function():
+        ...
+
+    assert not is_lambda(function)