Split project into base and example.

src/main/resources/log4j2.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="INFO">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
\ No newline at end of file

src/test/java/org/jastadd/ros2rag/tests/RosToRagTest.java

+package org.jastadd.ros2rag.tests;
+
+import org.jastadd.ros2rag.compiler.Compiler;
+import org.jastadd.ros2rag.compiler.options.CommandLine;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+import java.nio.file.Paths;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class RosToRagTest {
+
+  void transform(String inputFile, String outputDir) throws CommandLine.CommandLineException {
+
+    System.out.println(Paths.get(".").toAbsolutePath());
+    assertTrue(Paths.get(inputFile).toFile().exists(), "input file does not exist");
+
+    File outputDirFile = Paths.get(outputDir).toFile();
+    if (outputDirFile.exists()) {
+      assertTrue(outputDirFile.isDirectory());
+      if (outputDirFile.list().length != 0) {
+        System.out.println("output directory is not empty!");
+      }
+    } else {
+      outputDirFile.mkdir();
+    }
+
+    String[] args = {
+        "--outputDir=" + outputDir,
+        inputFile
+    };
+
+    new Compiler(args);
+  }
+
+  @Test
+  void transformMinimalExample() throws CommandLine.CommandLineException {
+    transform("src/test/resources/MinimalExample.relast", "src/test/resources/out");
+  }
+}

src/test/resources/MinimalExample.relast

+Model ::= RobotArm ZoneModel ;
+
+ZoneModel ::= Size:Position SafetyZone:Zone*;
+
+Zone ::= Position*;
+
+RobotArm ::= Joint* EndEffector /<ShouldUseLowSpeed:Boolean>/ ;
+
+Joint ::= <Name> ;
+rel Join.CurrentPosition -> Position ;
+
+EndEffector : Joint;
+
+Position ::= <x:int> <y:int> <z:int> ;