Make attributes display properly in dashboard and add additional unit…

… tests

Attributes should be displayed in dashboad JSON format data, and, because we fixed the JSON display for when attributes are added, we should write additional unit tests for them.

pkg/document/crdt/tree.go

@@ -357,7 +357,14 @@ func marshal(builder *strings.Builder, node *TreeNode) {
 		}
 		marshal(builder, child.Value)
 	}
-	builder.WriteString(`]}`)
+	builder.WriteString(`]`)
+
+	if node.Attrs != nil && node.Attrs.Len() > 0 {
+		builder.WriteString(fmt.Sprintf(`,"attributes":`))
+		builder.WriteString(node.Attrs.Marshal())
+	}
+
+	builder.WriteString(`}`)
 }
 
 // DeepCopy copies itself deeply.

test/integration/tree_test.go

@@ -322,6 +322,9 @@ func TestTree(t *testing.T) {
 
 		assert.Equal(t, `<root><p bold="true">ab</p><p italic="true">cd</p></root>`, d1.Root().GetTree("t").ToXML())
 		assert.Equal(t, `<root><p bold="true">ab</p><p italic="true">cd</p></root>`, d2.Root().GetTree("t").ToXML())
+
+		assert.Equal(t, `{"type":"root","children":[{"type":"p","children":[{"type":"text","value":"ab"}],"attributes":{"bold":"true"}},{"type":"p","children":[{"type":"text","value":"cd"}],"attributes":{"italic":"true"}}]}`, d1.Root().GetTree("t").Marshal())
+		assert.Equal(t, `{"type":"root","children":[{"type":"p","children":[{"type":"text","value":"ab"}],"attributes":{"bold":"true"}},{"type":"p","children":[{"type":"text","value":"cd"}],"attributes":{"italic":"true"}}]}`, d2.Root().GetTree("t").Marshal())
 	})
 
 	t.Run("insert inline content to the same position(left) concurrently test", func(t *testing.T) {