Resolve "Allow collection and circular attributes as endpoint targets"

Closes #53 (closed)

• Check, if collection and circular attributes can be specified as send endpoint targets.
• Add test cases to ensure correct handling.
• Update documentation, that they can be used.

ragconnect.tests/src/test/java/org/jastadd/ragconnect/tests/AttributeTest.java

@@ -22,7 +22,6 @@ import static org.junit.jupiter.api.Assertions.*;
  * @author rschoene - Initial contribution
  */
 @Tag("Incremental")
-@Tag("New")
 public class AttributeTest extends AbstractMqttTest {
 
   private static final String TOPIC_WILDCARD = "attr/#";
@@ -180,7 +179,6 @@ public class AttributeTest extends AbstractMqttTest {
     senderString.setInput("test-01");
     checker.check();
 
-    // TODO check checks for (circular and) collection
     senderString.addA(new A().setValue("test-02").setInner(new Inner().setInnerValue("inner")));
     checker.addToNumberOfValues(2) // collection(2)
             .put(CHECK_COLLECTION, "[test-01, test-02]")
@@ -289,7 +287,6 @@ public class AttributeTest extends AbstractMqttTest {
 
   private void checkCollection(String name, String expected) {
     if (expected != null) {
-      // TODO probably need to tokenize actual and expected, and compare their elements without order
       assertThat(receiverRoot.getFromCollectionWithMapping()).hasSizeGreaterThan(4).endsWith("post");
       checkCollectionContent(name, expected, receiverRoot.getFromCollectionNoMapping());
       checkCollectionContent(name + " mapped", expected, receiverRoot.getFromCollectionWithMapping().substring(0, receiverRoot.getFromCollectionWithMapping().length() - 4));