applets: add basic appium tests
To make sure the widgets can be opened
| Widget | Test availability |
|---|---|
| activitybar |
|
| analog-clock |
|
| appmenu |
|
| batterymonitor | !3323 (merged) |
| cameraindicator |
|
| calendar |
|
| clipboard |
|
| devicenotifier |
|
| digital-clock |
|
| icon |
|
| lock_logout |
|
| manage-inputmethod |
|
| mediacontroller |
|
| notifications |
|
| panelspacer |
|
| systemmonitor |
|
| systemtray |
|
Edited by Fushan Wen