Tests moved into separate folders (#3794)

Fix android crash on application exit

tests/app/platform/platform-tests.ts

@@ -0,0 +1,40 @@
+import * as TKUnit from "../TKUnit";
+import * as app from "tns-core-modules/application";
+import { isIOS, isAndroid } from "tns-core-modules/platform";
+
+// >> platform-require
+import * as platformModule from "tns-core-modules/platform";
+// << platform-require
+
+export function test_setTimeout_isDefined() {
+    var expected;
+    if (app.android) {
+        expected = "Android";
+    }
+    else {
+        expected = "iOS";
+    }
+    TKUnit.assertEqual(platformModule.device.os, expected, "device.os");
+};
+
+export function snippet_print_all() {
+    // >> platform-current
+    console.log("Device model: " + platformModule.device.model);
+    console.log("Device type: " + platformModule.device.deviceType);
+    console.log("OS: " + platformModule.device.os);
+    console.log("OS version: " + platformModule.device.osVersion);
+    console.log("SDK Version: " + platformModule.device.sdkVersion);
+
+    console.log("Screen width: " + platformModule.screen.mainScreen.widthPixels);
+    console.log("Screen height: " + platformModule.screen.mainScreen.heightPixels);
+    console.log("Screen scale: " + platformModule.screen.mainScreen.scale);
+    // << platform-current
+};
+
+export function testIsIOSandIsAndroid() {
+    if (isIOS) {
+        TKUnit.assertTrue(!!NSObject, "isIOS is true-ish but common iOS APIs are not available.");
+    } else if (isAndroid) {
+        TKUnit.assertTrue(!!android, "isAndroid is true but common 'android' package is not available.");
+    }
+}

tests/app/platform/platform.md

@@ -0,0 +1,14 @@
+---
+nav-title: "platform How-To"
+title: "platform"
+environment: nativescript
+description: "Examples for using platform"
+previous_url: /ApiReference/platform/HOW-TO
+---
+# Platform
+Information about the current device and screen are defined in the platform module
+### Declaring platform module to be available for further usage.
+{%snippet platform-require%}
+
+### Getting information about the current device:
+{%snippet platform-current%}