support/testing: add python-attrs tests

Use a minimal script to check the basic usage creating a class with 2
attributes.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/package/sample_python_attrs.py

@@ -0,0 +1,15 @@
+import attr
+
+
+@attr.s
+class Obj(object):
+    x = attr.ib()
+    y = attr.ib(default=1)
+
+
+obj1 = Obj(2)
+assert(obj1.x == 2)
+assert(obj1.y == 1)
+obj2 = Obj(3, 4)
+assert(obj2.x == 3)
+assert(obj2.y == 4)