test: verify i18n extension diagram roundtrips

test/fixtures/bpmn/i18n.bpmn

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:i18n="http://www.omg.org/spec/BPMN/non-normative/extensions/i18n/1.0" xmlns:modeler="http://camunda.org/schema/modeler/1.0" id="Definitions_1xsinej" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="4.8.0-rc.0" modeler:executionPlatform="Camunda Platform" modeler:executionPlatformVersion="7.15.0" xml:lang="en">
+  <bpmn:process id="Process_0dp8lmr" isExecutable="true">
+    <bpmn:startEvent id="StartEvent_1">
+      <bpmn:documentation>A start event.</bpmn:documentation>
+      <bpmn:extensionElements>
+        <i18n:translation xml:lang="de">Startereignis</i18n:translation>
+        <i18n:translation target="@isInterrupting" xml:lang="de">ja</i18n:translation>
+        <i18n:translation target="documentation" xml:lang="de">Ein Startereignis.</i18n:translation>
+      </bpmn:extensionElements>
+      <bpmn:outgoing>Flow_1lpbdia</bpmn:outgoing>
+    </bpmn:startEvent>
+    <bpmn:task id="Activity_0eb4n4l">
+      <bpmn:incoming>Flow_1lpbdia</bpmn:incoming>
+      <bpmn:outgoing>Flow_0cg72xx</bpmn:outgoing>
+    </bpmn:task>
+    <bpmn:sequenceFlow id="Flow_1lpbdia" sourceRef="StartEvent_1" targetRef="Activity_0eb4n4l" />
+    <bpmn:endEvent id="Event_1kw5c3l" name="Ended">
+      <bpmn:incoming>Flow_0cg72xx</bpmn:incoming>
+    </bpmn:endEvent>
+    <bpmn:sequenceFlow id="Flow_0cg72xx" sourceRef="Activity_0eb4n4l" targetRef="Event_1kw5c3l" />
+  </bpmn:process>
+  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
+    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_0dp8lmr">
+      <bpmndi:BPMNEdge id="Flow_1lpbdia_di" bpmnElement="Flow_1lpbdia">
+        <di:waypoint x="215" y="117" />
+        <di:waypoint x="270" y="117" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNEdge id="Flow_0cg72xx_di" bpmnElement="Flow_0cg72xx">
+        <di:waypoint x="370" y="117" />
+        <di:waypoint x="432" y="117" />
+      </bpmndi:BPMNEdge>
+      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">
+        <dc:Bounds x="179" y="99" width="36" height="36" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Activity_0eb4n4l_di" bpmnElement="Activity_0eb4n4l">
+        <dc:Bounds x="270" y="77" width="100" height="80" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Event_1kw5c3l_di" bpmnElement="Event_1kw5c3l">
+        <dc:Bounds x="432" y="99" width="36" height="36" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="434" y="142" width="32" height="14" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNShape>
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</bpmn:definitions>

test/spec/xml/roundtrip.js

@@ -655,6 +655,23 @@ describe('bpmn-moddle - roundtrip', function() {
     });
 
 
+    it('i18n', async function() {
+
+      // given
+      var {
+        rootElement
+      } = await fromFile('test/fixtures/bpmn/i18n.bpmn');
+
+      // when
+      var {
+        xml
+      } = await toXML(rootElement, { format: true });
+
+      // then
+      await validate(xml);
+    });
+
+
     it('BPMN in color properties', async function() {
 
       // given