Add worker PostMessage data test.

assets/runtime/android/files/android-runtime-1408/main-page.js

@@ -0,0 +1,54 @@
+/*
+In NativeScript, a file with the same name as an XML file is known as
+a code-behind file. The code-behind is a great place to place your view
+logic, and to set up your page’s data binding.
+*/
+
+/*
+NativeScript adheres to the CommonJS specification for dealing with
+JavaScript modules. The CommonJS require() function is how you import
+JavaScript modules defined in other files.
+*/
+const createViewModel = require("./main-view-model").createViewModel;
+
+function onNavigatingTo(args) {
+    /*
+    This gets a reference this page’s <Page> UI component. You can
+    view the API reference of the Page to see what’s available at
+    https://docs.nativescript.org/api-reference/classes/_ui_page_.page.html
+    */
+    const page = args.object;
+
+    /*
+    A page’s bindingContext is an object that should be used to perform
+    data binding between XML markup and JavaScript code. Properties
+    on the bindingContext can be accessed using the {{ }} syntax in XML.
+    In this example, the {{ message }} and {{ onTap }} bindings are resolved
+    against the object returned by createViewModel().
+
+    You can learn more about data binding in NativeScript at
+    https://docs.nativescript.org/core-concepts/data-binding.
+    */
+    page.bindingContext = createViewModel();
+}
+
+let worker;
+if (global.TNS_WEBPACK) {
+    const testWorker = require("nativescript-worker-loader!./worker.js");
+    worker = new testWorker();
+} else {
+    worker = new Worker("./worker.js");
+}
+worker.onmessage = (msg) => {
+    console.dir(msg.data);
+};
+worker.onerror = function(err) {
+    console.log("Worker Error: ", err, err.stack);
+};
+/*
+Exporting a function in a NativeScript code-behind file makes it accessible
+to the file’s corresponding XML file. In this case, exporting the onNavigatingTo
+function here makes the navigatingTo="onNavigatingTo" binding in this page’s XML
+file work.
+*/
+exports.onNavigatingTo = onNavigatingTo;

assets/runtime/android/files/android-runtime-1408/worker.js

@@ -0,0 +1,8 @@
+require ("tns-core-modules/globals/globals");
+// Give NS a couple seconds to get everything up on main thread...  
+setTimeout( () => { startWorker(); }, 3000);
+function startWorker() {
+    let r1 = {blah: "a"};                            // This is our row data...
+    let d = {Hi: "Hi", table1: [r1, r1], table2: [r1]};  // This is our final data...
+    global.postMessage({id: 1, data: d, data2: JSON.stringify(d)}); // Send it on thru
+}

tests/runtimes/android/android_runtime_tests.py

@@ -531,6 +531,48 @@ def test_446_test_print_stack_trace_in_release_and_debug(self):
                                  timeout=15, period=5)
         assert test_result, 'Error message in tns log cat should be shown! Logs:' + log_cat
 
+    def test_447_test_worker_post_message(self):
+        """
+         https://github.com/NativeScript/android-runtime/issues/1408
+        """
+
+        source_js = os.path.join(TEST_RUN_HOME, 'assets', 'runtime', 'android', 'files', 'android-runtime-1408',
+                                 'main-page.js')
+        target_js = os.path.join(TEST_RUN_HOME, APP_NAME, 'app', 'main-page.js')
+        File.copy(source=source_js, target=target_js, backup_files=True)
+        source_js = os.path.join(TEST_RUN_HOME, 'assets', 'runtime', 'android', 'files', 'android-runtime-1408',
+                                 'worker.js')
+        target_js = os.path.join(TEST_RUN_HOME, APP_NAME, 'app', 'worker.js')
+        File.copy(source=source_js, target=target_js, backup_files=True)
+        log = Tns.run_android(APP_NAME, device=self.emulator.id, wait=False, verify=False)
+        correct_object = """JS: ==== object dump start ====
+JS: id: "1"
+JS: data: {
+JS:   "Hi": "Hi",
+JS:   "table1": [
+JS:     {
+JS:       "blah": "a"
+JS:     },
+JS:     {
+JS:       "blah": "a"
+JS:     }
+JS:   ],
+JS:   "table2": [
+JS:     {
+JS:       "blah": "a"
+JS:     }
+JS:   ]
+JS: }
+JS: data2: "{"Hi":"Hi","table1":[{"blah":"a"},{"blah":"a"}],"table2":[{"blah":"a"}]}"
+JS: ==== object dump end ===="""
+        strings = ['Successfully synced application', 'Successfully installed on device with identifier']
+
+        test_result = Wait.until(lambda: all(string in File.read(log.log_file) for string in strings), timeout=300,
+                                 period=5)
+        assert test_result, 'Build was not successful! Logs:' + File.read(log.log_file)
+        test_result = Wait.until(lambda: correct_object in File.read(log.log_file), timeout=30, period=5)
+        assert test_result, 'Worker PostMessage Data is not correct! Logs:' + File.read(log.log_file)
+
     def test_500_test_ES6_support(self):
         """
          https://github.com/NativeScript/android-runtime/issues/1375