Check attrs initializers and validators signatures (PY-26354)

python/testData/inspections/PyDataclassInspection/attrsInitializersAndValidators.py

@@ -0,0 +1,27 @@
+import attr
+
+
+@attr.s
+class A:
+    x = attr.ib()
+
+    @x.default
+    def init_x1(self):
+        return 10
+
+    @x.validator
+    def check_x1(self, attribute, value):
+        pass
+
+
+@attr.s
+class A:
+    x = attr.ib()
+
+    @x.default
+    def init_x2<error descr="'init_x2' should take only 1 parameter">(self, attribute, value)</error>:
+        return 10
+
+    @x.validator
+    def check_x2<error descr="'check_x2' should take only 3 parameters">(self)</error>:
+        pass