added test call example and install cmake to debian/ubuntu section (#93)

docs/devs/building/unix.md

@@ -27,6 +27,11 @@ Generic build process looks like this (with cmake):
 	cd i2pd/
 	make
 
+Then run the tests:
+
+	cd i2pd/tests/
+	make
+
 After successful build i2pd could be installed with:
 
 	make install
@@ -55,9 +60,9 @@ Also there is `-L` flag for CMake that could be used to list current cached opti
 Debian/Ubuntu
 -------------
 
-You will need a compiler and other tools that could be installed with `build-essential` and `debhelper` packages:
+You will need a compiler and other tools that could be installed with `build-essential`, `debhelper` and `cmake` packages:
 
-	sudo apt-get install build-essential debhelper
+	sudo apt-get install build-essential debhelper cmake
 
 Also you will need a bunch of development libraries: