java - Testfx 4 Getting started -

i want implement simple gui test using testfx 4 on adjusted oracle 'hello world' javafx tutorial. based on testfx tutorial, git website unclear have start, , need.

could please guide me in right direction? side note, have added necessary dependencies in pom.xml

<repositories>         <repository>             <id>maven-central-repo</id>             <url>http://repo1.maven.org/maven2</url>             <snapshots>                 <enabled>false</enabled>             </snapshots>         </repository>     </repositories>     <dependencies>         <dependency>             <groupid>org.testfx</groupid>             <artifactid>testfx-core</artifactid>             <version>4.0.1-alpha</version>             <scope>test</scope>         </dependency>         <dependency>             <groupid>org.testfx</groupid>             <artifactid>testfx-junit</artifactid>             <version>4.0.1-alpha</version>             <scope>test</scope>         </dependency>     </dependencies> 

here adjusted hello world example

  public class helloworld extends application {     public static void main(string[] args) {         launch(args);     }      @override     public void start(stage primarystage) {         primarystage.settitle("hello world!");         button btn = new button();         label label = new label();          btn.settext("say 'hello world'");         label.settext("welcome");          btn.setonaction(new eventhandler<actionevent>() {                  @override             public void handle(actionevent event) {                label.settext("hello world.");             }         });     gridpane grid = new gridpane();     grid.setalignment(pos.center);     grid.sethgap(10);     grid.setvgap(10);     grid.setpadding(new insets(10, 10, 10, 10));     scene scene = new scene(grid, 300, 275);     primarystage.setscene(scene);      grid.add(label, 0, 0);     grid.add(hellobutton, 0, 1);     primarystage.show();     } }