Add tests for background worker support.

assets/runtime/android/files/android-runtime-1488/app.gradle

@@ -0,0 +1,22 @@
+// Add your native dependencies here:
+
+// Uncomment to add recyclerview-v7 dependency
+dependencies {
+  implementation "androidx.work:work-runtime:2.2.0"
+  implementation "androidx.lifecycle:lifecycle-runtime:2.1.0"
+  implementation "androidx.lifecycle:lifecycle-extensions:2.1.0"
+}
+
+// If you want to add something to be applied before applying plugins' include.gradle files
+// e.g. project.ext.googlePlayServicesVersion = "15.0.1"
+// create a file named before-plugins.gradle in the current directory and place it there
+
+android {
+  defaultConfig {
+    minSdkVersion 17
+    generatedDensities = []
+  }
+  aaptOptions {
+    additionalParameters "--no-version-vectors"
+  }
+}

assets/runtime/android/files/android-runtime-1488/app.js

@@ -0,0 +1,27 @@
+/*
+In NativeScript, the app.js file is the entry point to your application.
+You can use this file to perform app-level initialization, but the primary
+purpose of the file is to pass control to the app’s first module.
+*/
+
+const application = require("tns-core-modules/application");
+
+var MyWorker = androidx.work.Worker.extend("com.tns.jobs.MyWorker",{
+     doWork:function(){
+        	   // Do your work here.
+
+        	   //
+        	   return androidx.work.ListenableWorker.Result.success();
+        	},
+
+        	onStopped:function() {
+        	  // Cleanup because you are being stopped.
+        	  console.log("onStopped from MyWorker !!!")
+        	}
+});
+application.run({ moduleName: "app-root" });
+
+/*
+Do not place any code after the application has been started as it will not
+be executed on iOS.
+*/

assets/runtime/android/files/android-runtime-1488/main-view-model.js

@@ -0,0 +1,55 @@
+const Observable = require("tns-core-modules/data/observable").Observable;
+
+function getMessage(counter) {
+    if (counter <= 0) {
+        return "Hoorraaay! You unlocked the NativeScript clicker achievement!";
+    } else {
+        return `${counter} taps left`;
+    }
+}
+
+
+function getJobConstrains() {
+        return (new androidx.work.Constraints.Builder())
+                    .build();
+    }
+
+    function getWorkRequest() {
+        let constrains = getJobConstrains();
+		return (new androidx.work.OneTimeWorkRequest.Builder(java.lang.Class.forName("com.tns.jobs.MyWorker")))
+            .setConstraints(constrains)        
+            .build()
+    }
+
+    function enqueue() {
+        let worker = getWorkRequest();
+
+		(androidx.work.WorkManager).getInstance()
+          .enqueueUniqueWork("jojoworker", androidx.work.ExistingWorkPolicy.REPLACE , worker); 
+
+        let lifecycleowner = androidx.lifecycle.ProcessLifecycleOwner.get();
+
+        (androidx.work.WorkManager).getInstance().getWorkInfoByIdLiveData(worker.getId())
+            .observe(lifecycleowner, new androidx.lifecycle.Observer({
+                onChanged : function(workInfo) {
+
+                    console.log("OnChange 1 : ", workInfo)
+
+				}
+			}))
+    }
+function createViewModel() {
+    const viewModel = new Observable();
+    viewModel.counter = 42;
+    viewModel.message = getMessage(viewModel.counter);
+
+    viewModel.onTap = () => {
+        viewModel.counter--;
+        viewModel.set("message", getMessage(viewModel.counter));
+        enqueue();
+    };
+
+    return viewModel;
+}
+
+exports.createViewModel = createViewModel;

tests/runtimes/android/android_service_tests.py

@@ -178,7 +178,32 @@ def test_203_test_foreground__intent_service_without_oncreate_method_is_working_
                                  period=5)
         assert test_result, "Intent service is not working! Missing Log! Logs: " + File.read(log.log_file)
 
-    def test_204_test_foreground__intent_service_without_oncreate_method_is_working_api28(self):
+    def test_204_test_background_worker_support(self):
+        """
+         https://github.com/NativeScript/android-runtime/issues/1488
+        """
+        Adb.clear_logcat(self.emulator.id)
+        File.copy(os.path.join(TEST_RUN_HOME, 'assets', 'runtime', 'android', 'files',
+                               'android-runtime-1488', 'app.js'),
+                  os.path.join(TEST_RUN_HOME, APP_NAME, 'app', 'app.js'), True)
+        File.copy(os.path.join(TEST_RUN_HOME, 'assets', 'runtime', 'android', 'files',
+                               'android-runtime-1488', 'main-view-model.js'),
+                  os.path.join(TEST_RUN_HOME, APP_NAME, 'app', 'main-view-model.js'), True)
+        File.copy(os.path.join(TEST_RUN_HOME, 'assets', 'runtime', 'android', 'files',
+                               'android-runtime-1488', 'app.gradle'),
+                  os.path.join(TEST_RUN_HOME, APP_NAME, 'app', 'App_Resources', 'Android', 'app.gradle'), True)
+        log = Tns.run_android(APP_NAME, device=self.emulator.id, wait=False, verify=False)
+        strings = ['Successfully synced application', 'on device', self.emulator.id]
+        test_result = Wait.until(lambda: all(string in File.read(log.log_file) for string in strings), timeout=240,
+                                 period=5)
+        assert test_result, "App not build correctly ! Logs: " + File.read(log.log_file)
+        Device.click(self.emulator, text="TAP", case_sensitive=True)
+        time.sleep(5)
+        device_log = Adb.get_logcat(self.emulator.id)
+        error_message = "Background worker not working as expected. Logs: "+device_log
+        assert "WM-WorkerWrapper: Worker result SUCCESS for Work" in device_log, error_message
+
+    def test_205_test_foreground__intent_service_without_oncreate_method_is_working_api28(self):
         """
          https://github.com/NativeScript/android-runtime/issues/1426
         """
@@ -204,5 +229,3 @@ def test_204_test_foreground__intent_service_without_oncreate_method_is_working_
         test_result = Wait.until(lambda: "Intent Handled!" in File.read(log.log_file), timeout=30,
                                  period=5)
         assert test_result, "Intent service is not working! Missing Log! Logs: " + File.read(log.log_file)
-        DeviceManager.Emulator.stop()
-        self.emulator = DeviceManager.Emulator.ensure_available(Emulators.DEFAULT)