1 files changed, 28 insertions, 0 deletions
diff --git a/parser/htmlparser/tests/mochitest/browser_viewsource.js b/parser/htmlparser/tests/mochitest/browser_viewsource.js
new file mode 100644
index 0000000000..e4d44e05be
--- /dev/null
+++ b/parser/htmlparser/tests/mochitest/browser_viewsource.js
@@ -0,0 +1,28 @@
+"use strict";
+
+add_task(async function () {
+  const PAGE_URL = getRootDirectory(gTestPath) + "file_viewsource.html";
+  let viewSourceTab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "view-source:" + PAGE_URL
+  );
+
+  let xhrPromise = new Promise(resolve => {
+    let xhr = new XMLHttpRequest();
+    xhr.open("GET", PAGE_URL, true);
+    xhr.onload = event => resolve(event.target.responseText);
+    xhr.send();
+  });
+
+  let viewSourceContentPromise = SpecialPowers.spawn(
+    viewSourceTab.linkedBrowser,
+    [],
+    async function () {
+      return content.document.body.textContent;
+    }
+  );
+
+  let results = await Promise.all([viewSourceContentPromise, xhrPromise]);
+  is(results[0], results[1], "Sources should match");
+  BrowserTestUtils.removeTab(viewSourceTab);
+});