Make a few test cases

Author: Jackenmen

testsuite/python38.py

@@ -53,3 +53,49 @@ def f3(
 #: E221:1:6 E221:1:19
 if (x  := 1) == (y  := 2):
     pass
+#: Okay
+def f(
+    x=4 / 2, y=(1, 4 / 2), /
+):
+    ...
+#: W504:4:14
+def f(
+    x=4 / 2,
+    y=(
+        1, 4 /
+        2
+    ),
+    /
+):
+    ...
+#: W504:2:9
+def f(
+    x=4 /
+    2,
+    y=(1, 4 / 2),
+    /
+):
+    ...
+#: Okay
+def f(
+    x=4 / 2, y=(1, 4 / 2), /
+):
+    ...
+#: W503:5:9
+def f(
+    x=4 / 2,
+    y=(
+        1, 4
+        / 2
+    ),
+    /
+):
+    ...
+#: W503:3:5
+def f(
+    x=4
+    / 2,
+    y=(1, 4 / 2),
+    /
+):
+    ...