update changes in hello world ng template

Author: endarova

data/changes.py

@@ -66,7 +66,7 @@ class NGHelloWorld(object):
                        old_value='Ter Stegen', new_value='Unknown',
                        old_text='Ter Stegen', new_text='Unknown')
         CSS = ChangeSet(file_path=os.path.join('src', 'app.css'),
-                        old_value='}', new_value='}\nListView { background-color: pink;}\n',
+                        old_value='}', new_value='}\nLabel{background-color:pink;}\n',
                         old_color=Colors.WHITE, new_color=Colors.PINK)
         HTML = ChangeSet(file_path=os.path.join('src', 'app', 'item', 'items.component.html'), old_value='"item.name"',
                          new_value='"item.id"', old_text=None, new_text=None)

data/sync/hello_world_ng.py

@@ -8,7 +8,9 @@
 from core.enums.device_type import DeviceType
 from core.enums.platform_type import Platform
 from core.enums.os_type import OSType
+from core.log.log import Log
 from core.settings import Settings
+from core.utils.wait import Wait
 from data.changes import Changes, Sync
 from data.const import Colors
 from products.nativescript.preview_helpers import Preview
@@ -90,7 +92,9 @@ def sync_hello_world_ng(app_name, platform, device, bundle=True, uglify=False, a
                                    device=device)
     TnsLogs.wait_for_log(log_file=result.log_file, string_list=strings, timeout=180,
                          not_existing_string_list=not_existing_string_list)
-    device.wait_for_main_color(color=Changes.NGHelloWorld.CSS.new_color)
+    assert Wait.until(lambda: device.get_pixels_by_color(color=Changes.NGHelloWorld.CSS.new_color) > 100), \
+        'CSS on root level not applied!'
+    Log.info('CSS on root level applied successfully!')
 
     # Revert changes
     Sync.revert(app_name=app_name, change_set=Changes.NGHelloWorld.HTML)
@@ -116,7 +120,9 @@ def sync_hello_world_ng(app_name, platform, device, bundle=True, uglify=False, a
                                    device=device)
     TnsLogs.wait_for_log(log_file=result.log_file, string_list=strings, timeout=180,
                          not_existing_string_list=not_existing_string_list)
-    device.wait_for_main_color(color=Colors.WHITE)
+    assert Wait.until(lambda: device.get_pixels_by_color(color=Changes.NGHelloWorld.CSS.new_color) < 100), \
+        'CSS on root level not applied!'
+    Log.info('CSS on root level applied successfully!')
 
     # Assert final and initial states are same
     initial_state = os.path.join(Settings.TEST_OUT_IMAGES, device.name, 'initial_state.png')