Add Ubuntu test container and split tests

ci/ubuntu/Dockerfile

@@ -0,0 +1,25 @@
+# A Ubuntu based build image
+#
+# This should be as identical as possible with the official GitHub Actions Ubuntu image
+#     https://github.com/actions/runner-images
+#
+# Based on https://hub.docker.com/_/ubuntu/
+
+# podman build -f Dockerfile -t build-on-ubuntu
+# podman run -it --name build-on-ubuntu build-on-ubuntu:latest
+# => ./clone-and-build.sh
+
+FROM docker.io/ubuntu:latest
+LABEL version="0.1.0"
+
+ENV JAVA_TOOL_OPTIONS "-Dfile.encoding=UTF8"
+
+COPY clone-and-build.sh clone-and-build.sh
+RUN chmod +x clone-and-build.sh
+
+RUN apt-get -y update
+RUN apt-get -y upgrade
+RUN apt-get -y install git
+RUN apt-get -y install openjdk-11-jdk-headless
+RUN apt-get -y install libgtk-4-1
+RUN apt-get -y clean

ci/ubuntu/clone-and-build.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+test -d java-gtk || git clone "https://github.com/bailuk/java-gtk.git" || exit 1
+
+cd java-gtk  || exit 1
+git pull     || exit 1
+
+./gradlew generate || exit 1
+./gradlew build

java-gtk/src/main/java/ch/bailu/gtk/type/PropertyHolder.java

@@ -32,8 +32,6 @@ public Str getStrProperty(String name) {
         return value.getString();
     }
 
-
-
     public Pointer getObjectProperty(String name) {
         var value = initValue(Object.getTypeID());
         getProperty(name, value);

java-gtk/src/test/java/ch/bailu/gtk/TestPropertyAccess.java

@@ -27,13 +27,12 @@ public static boolean gtkInit() {
     }
 
     public static boolean checkVersion() {
-        return  Glib.checkVersion(2, 44,0).isNull();
+        return  Glib.checkVersion(2, 74, 0).isNull();
     }
 
     @Test
     @EnabledIf("checkVersion")
-    public void testPropertyAccess() {
-
+    public void testPropertyAccessListStore() {
         var listStore = new ListStore(TextTag.getTypeID());
         var textTag = new TextTag("test");
 
@@ -44,6 +43,12 @@ public void testPropertyAccess() {
         var textTagGet = new TextTag(listStore.asListModel().getItem(0).cast());
         assertEquals("test", textTagGet.getStringProperty("name"));
         assertEquals("test", textTag.getStringProperty("name"));
+    }
+
+    @Test
+    public void testPropertyAccessTextTag() {
+        var textTag = new TextTag("test");
+        assertEquals("test", textTag.getStringProperty("name"));
 
         textTag.setBooleanProperty("accumulative-margin", false);
         assertFalse(textTag.getBooleanProperty("accumulative-margin"));