first commit

test/integration/thumbnail_view_spec.mjs

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+import { closePages, loadAndWait } from "./test_utils.mjs";
+
+describe("PDF Thumbnail View", () => {
+  describe("Works without errors", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait("tracemonkey.pdf", "#sidebarToggleButton");
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("should render thumbnails without errors", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.click("#sidebarToggleButton");
+
+          const thumbSelector = "#thumbnailView .thumbnailImage";
+          await page.waitForSelector(thumbSelector, { visible: true });
+
+          await page.waitForSelector(
+            '#thumbnailView .thumbnail[data-loaded="true"]'
+          );
+
+          const src = await page.$eval(thumbSelector, el => el.src);
+          expect(src)
+            .withContext(`In ${browserName}`)
+            .toMatch(/^data:image\//);
+        })
+      );
+    });
+  });
+});