Tests moved into separate folders (#3794)

Fix android crash on application exit

tests/app/timer/timer.md

@@ -0,0 +1,25 @@
+---
+nav-title: "timer How-To"
+title: "timer"
+environment: nativescript
+description: "Examples for using timer"
+previous_url: /ApiReference/timer/HOW-TO
+---
+# Timer module
+### How to require timer module
+{%snippet timer-require%}
+
+### Evaluates an expression after 0 milliseconds.
+{%snippet timer-set-zero%}
+
+### Evaluates an expression after a specified number of milliseconds.
+{%snippet timer-set-fivehundred%}
+
+### Cancels the evaluation with the clearTimeout method.
+{%snippet timer-set-twothousands%}
+
+### Evaluates an expression each time a specified number of milliseconds has elapsed.
+{%snippet timer-set-expression%}
+
+### Cancel the interval previously started using the setInterval method.
+{%snippet timer-set-interval%}