Add test for decorator expressions

test/test_decorator_expressions.py

@@ -0,0 +1,62 @@
+import ast
+import sys
+import pytest
+from python_minifier import unparse
+from python_minifier.ast_compare import compare_ast
+
+def test_pep():
+    if sys.version_info < (3, 9):
+        pytest.skip('Decorator expression not allowed in python <3.9')
+
+    source = """
+buttons = [QPushButton(f'Button {i}') for i in range(10)]
+
+# Do stuff with the list of buttons...
+
+@buttons[0].clicked.connect
+def spam():
+    ...
+
+@buttons[1].clicked.connect
+def eggs():
+    ...
+
+# Do stuff with the list of buttons...
+@(f, g)
+def a(): pass
+
+@(f, g)
+class A:pass
+
+@lambda func: (lambda *p: func(*p).u())
+def g(n): pass
+
+@s := lambda func: (lambda *p: func(*p).u())
+def g(name): pass
+
+@s
+def r(n, t):
+    pass
+
+@lambda f: lambda *p: f or f(*p).u()
+def g(name): pass
+
+@lambda f: lambda *p: \
+        [_ for _ in [ \
+            f(*p),
+            ] if _][0]
+def c(): pass
+
+@lambda f: lambda *p: \
+            list(filter(lambda _: _,[
+                (a := t()) and False,
+                f(*p),
+                (b := t()) and False,
+            ]))[0]
+def c(): pass
+
+"""
+
+    expected_ast = ast.parse(source)
+    actual_ast = unparse(expected_ast)
+    compare_ast(expected_ast, ast.parse(actual_ast))