revert changes to exporter test

Author: sidvishnoi

tests/spec/core/exporter-spec.js

@@ -7,12 +7,11 @@ describe("Core - exporter", () => {
 
   async function getExportedDoc(ops) {
     const doc = await makeRSDoc(ops);
-
-    doc.getElementById("respec-pill").click();
-    doc.getElementById("respec-button-export").click();
-    await new Promise(res => setTimeout(res, 100)); // XXX
-    const dataURL = doc.getElementById("respec-save-as-html").href;
-
+    const dataURL = await new Promise(resolve => {
+      doc.defaultView.require(["core/exporter"], ({ rsDocToDataURL }) =>
+        resolve(rsDocToDataURL("text/html", doc))
+      );
+    });
     const docString = decodeURIComponent(dataURL).replace(
       "data:text/html;charset=utf-8,",
       ""