Added unit test for changing the context: ContextChangeTest.java

Reformatting the setContext function.
Added entry to CHANGELOG.adoc

CHANGELOG.adoc

@@ -16,7 +16,7 @@ For a detailed view of what has changed, refer to the {url-repo}/commits/main[co
 === Breaking changes
 
 Improvement::
-
+* Add `setContext` function to StructuralNode. Move `getContext`
 * Fix Macro APIs to take StructuralNodes and return Phrase- or StructuralNodes. (#1084)
 * Allow Preprocessor extensions to create new Readers and replace the original Reader. (#1081)
 * Set Java 11 as the minimal version (#1151) (@abelsromero)

asciidoctorj-api/src/main/java/org/asciidoctor/ast/ContentNode.java

@@ -18,6 +18,8 @@ public interface ContentNode {
 
     String getContext();
 
+    void setContext(String context);
+
     Document getDocument();
 
     boolean isInline();

asciidoctorj-core/src/main/java/org/asciidoctor/jruby/ast/impl/ContentNodeImpl.java

@@ -34,6 +34,11 @@ public String getContext() {
         return getString("context");
     }
 
+    @Override
+    public void setContext(String context) {
+        setString("context", context);
+
+    }
 
     @Override
     public ContentNode getParent() {

asciidoctorj-core/src/test/java/org/asciidoctor/jruby/ast/impl/ContextChangeTest.java

@@ -0,0 +1,53 @@
+package org.asciidoctor.jruby.ast.impl;
+
+import org.asciidoctor.Asciidoctor;
+import org.asciidoctor.Attributes;
+import org.asciidoctor.Options;
+import org.asciidoctor.ast.Document;
+import org.asciidoctor.ast.StructuralNode;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+public class ContextChangeTest  {
+
+    private final Asciidoctor asciiDoctor = Asciidoctor.Factory.create();
+
+    static String orderedListSample() {
+        return "= Document Title\n\n" +
+                "== Section A\n\n" +
+                ". This it item 1 in an ordered list\n\n" +
+                ". This is item 2 in an ordered list\n\n" +
+                ". This is item 3 in and ordered list\n\n";
+
+    }
+
+    @Test
+    public void get_context_of_ordered_list(){
+
+        Document document = loadDocument(orderedListSample());
+
+        assertThat(document).isNotNull();
+        assertThat(document.getBlocks().size()).isEqualTo(1);
+
+        StructuralNode orderedList = document.getBlocks().get(0).getBlocks().get(0);
+        assertThat(orderedList).isNotNull();
+
+        // Odd – I expected this to send back :'olist'
+        assertThat(orderedList.getContext()).isEqualTo("olist");
+
+        // But can you change it?
+
+        orderedList.setContext("colist");
+
+        assertThat(orderedList.getContext()).isEqualTo("colist");
+
+    }
+
+    private Document loadDocument(String source) {
+        Attributes attributes = Attributes.builder().sectionNumbers(false).build();
+        Options options = Options.builder().attributes(attributes).build();
+        return asciiDoctor.load(source, options);
+    }
+}