Newsletter: New chapter in the OS dev tutorials

Author: andre-richter

content/2019-12-26-newsletter-22.md

@@ -33,7 +33,8 @@ If you want to mention something in [the next newsletter], send us a pull reques
 
 <!-- TODO Add news related to embedded Rust that are not about new crates releases here -->
 
-- TODO(remove, this is an example) "const generics" has landed in nightly!
+- [@andre-richter] added a new tutorial for the `Operating System development tutorials in Rust on the Raspberry Pi` series:
+    - Tutorial 13: [Integrated Testing](https://github.com/rust-embedded/rust-raspi3-OS-tutorials/tree/master/13_integrated_testing) - Kernel `Unit tests`, `Integration tests` and `Console tests` using `QEMU`. 
 
 - TODO(remove, this is an example) the Rust compiler has gained cross compilation support for the Xtensa architecture!