test(core/seo): check that meta description is inserted on idle

tests/spec/core/seo-spec.js

@@ -4,29 +4,43 @@ describe("Core — Seo", () => {
   it("doesn't insert a meta description element if there is no abstract", async () => {
     const ops = {
       config: makeBasicConfig(),
-      body: `
-        <section id="">
-          <p>Fail</p>
-        </section>`,
+      abstract: "\n",
+      body: makeDefaultBody(),
     };
     const doc = await makeRSDoc(ops);
     await doc.respecIsReady;
-    expect(doc.querySelectorAll("meta[name=description]").length).toEqual(0);
+    await new Promise(resolve => {
+      const check = () => {
+        const hasMetaDesc = doc.querySelectorAll("meta[name=description]")
+          .length;
+        expect(hasMetaDesc).toEqual(0);
+        resolve();
+      };
+      window.requestIdleCallback ? window.requestIdleCallback(check) : check();
+    });
   });
 
-  it("inserts a meta description element after processing", async () => {
+  it("inserts a meta element for the description after processing", async () => {
     const ops = {
       config: makeBasicConfig(),
-      body: `
-        <section id="abstract">
-          <p>Pass</p>
-          <p>Fail</p>
-        </section>`,
+      abstract: `<p>
+        Pass \t
+      </p>
+      <p>Fail</p>`,
+      body: makeDefaultBody(),
     };
     const doc = await makeRSDoc(ops);
     await doc.respecIsReady;
-    expect(doc.querySelectorAll("meta[name=description]").length).toEqual(1);
-    const meta = doc.head.querySelector("meta[name=description]");
-    expect(meta.content).toEqual("Pass");
+    await new Promise(resolve => {
+      const check = () => {
+        const hasMetaDesc = doc.querySelectorAll("meta[name=description]")
+          .length;
+        expect(hasMetaDesc).toEqual(1);
+        const meta = doc.head.querySelector("meta[name=description]");
+        expect(meta.content).toEqual("Pass");
+        resolve();
+      };
+      window.requestIdleCallback ? window.requestIdleCallback(check) : check();
+    });
   });
 });