1 files changed, 56 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_dont_process_switch_204.js b/browser/base/content/test/tabs/browser_dont_process_switch_204.js
new file mode 100644
index 0000000000..009ef54340
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_dont_process_switch_204.js
@@ -0,0 +1,56 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_ROOT = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+const TEST_URL = TEST_ROOT + "204.sjs";
+const BLANK_URL = TEST_ROOT + "blank.html";
+
+// Test for bug 1626362.
+add_task(async function () {
+  await BrowserTestUtils.withNewTab("about:robots", async function (aBrowser) {
+    // Get the current pid for browser for comparison later, we expect this
+    // to be the parent process for about:robots.
+    let browserPid = await SpecialPowers.spawn(aBrowser, [], () => {
+      return Services.appinfo.processID;
+    });
+
+    is(
+      Services.appinfo.processID,
+      browserPid,
+      "about:robots should have loaded in the parent"
+    );
+
+    // Attempt to load a uri that returns a 204 response, and then check that
+    // we didn't process switch for it.
+    let stopped = BrowserTestUtils.browserStopped(aBrowser, TEST_URL, true);
+    BrowserTestUtils.loadURIString(aBrowser, TEST_URL);
+    await stopped;
+
+    let newPid = await SpecialPowers.spawn(aBrowser, [], () => {
+      return Services.appinfo.processID;
+    });
+
+    is(
+      browserPid,
+      newPid,
+      "Shouldn't change process when we get a 204 response"
+    );
+
+    // Load a valid http page and confirm that we did change process
+    // to confirm that we weren't in a web process to begin with.
+    let loaded = BrowserTestUtils.browserLoaded(aBrowser, false, BLANK_URL);
+    BrowserTestUtils.loadURIString(aBrowser, BLANK_URL);
+    await loaded;
+
+    newPid = await SpecialPowers.spawn(aBrowser, [], () => {
+      return Services.appinfo.processID;
+    });
+
+    isnot(browserPid, newPid, "Should change process for a valid response");
+  });
+});