Add TestFX and basic integration tests (#314)

* Add TestFX and basic integration tests

* more ui tests

* add emoji test

Author: jperedadnr

.github/assets/EmojiDemo.png

@@ -24,6 +24,8 @@ jobs:
 
       - name: Build project
         run: |
+          export DISPLAY=:90
+          Xvfb -ac :90 -screen 0 1280x1024x24 > /dev/null 2>&1 &
           mvn -B -ntp verify -f rta
 
       - name: Publish Snapshots

.github/workflows/build.yml

@@ -37,6 +37,11 @@
             <version>5.9.2</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.testfx</groupId>
+            <artifactId>testfx-junit5</artifactId>
+            <version>4.0.18</version>
+        </dependency>
     </dependencies>
 
     <developers>
@@ -135,7 +140,11 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>3.0.0-M5</version>
+                <version>3.0.0-M7</version>
+                <configuration>
+                    <trimStackTrace>false</trimStackTrace>
+                    <argLine>--add-opens javafx.graphics/com.sun.javafx.application=ALL-UNNAMED</argLine>
+                </configuration>
                 <dependencies>
                     <dependency>
                         <groupId>org.junit.jupiter</groupId>