1 files changed, 27 insertions, 0 deletions
diff --git a/toolkit/components/thumbnails/test/browser_thumbnails_capture_parent_process.js b/toolkit/components/thumbnails/test/browser_thumbnails_capture_parent_process.js
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+++ b/toolkit/components/thumbnails/test/browser_thumbnails_capture_parent_process.js
@@ -0,0 +1,27 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * These tests ensure that capturing a sites's thumbnail, saving it and
+ * retrieving it from the cache works, specifically for a parent process.
+ */
+add_task(async function thumbnails_capture() {
+  // Create a parent process tab with a red background.
+  // We do this by creating a parent process, then we update it to be a red page,
+  // before attempting to read the page colour.
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      // about:robots seems to be an simple parent process url we can test against,
+      // but any parent process url would have worked, example, about:home or about:config
+      url: "about:robots",
+    },
+    async browser => {
+      // Because about:robots is not generally a predictable testable page,
+      // we update its background to something we can test against.
+      browser.contentDocument.body.innerHTML = "";
+      browser.contentDocument.body.style.backgroundColor = "#ff0000";
+      await captureAndCheckColor(255, 0, 0, "we have a red thumbnail");
+    }
+  );
+});