1 files changed, 45 insertions, 0 deletions
diff --git a/dom/ipc/tests/test_bcg_processes.html b/dom/ipc/tests/test_bcg_processes.html
new file mode 100644
index 0000000000..8f68aa4a89
--- /dev/null
+++ b/dom/ipc/tests/test_bcg_processes.html
@@ -0,0 +1,45 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+
+<script type="application/javascript">
+"use strict";
+
+add_task(async function main_test() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["dom.ipc.processCount.webIsolated", 10]],
+  });
+
+  let frame1 = document.createElement("iframe");
+  frame1.src = "http://example.com";
+  document.body.appendChild(frame1);
+  await new Promise(resolve => {
+    frame1.addEventListener("load", resolve, { once: true })
+  });
+  info("frame 1 loaded");
+
+  let frame2 = document.createElement("iframe");
+  frame2.src = "http://example.com";
+  document.body.appendChild(frame2);
+  await new Promise(resolve => {
+    frame2.addEventListener("load", resolve, { once: true })
+  });
+  info("frame 2 loaded");
+
+  let id1 = await SpecialPowers.spawn(frame1, [], () => {
+    return ChromeUtils.domProcessChild.childId;
+  });
+  let id2 = await SpecialPowers.spawn(frame2, [], () => {
+    return ChromeUtils.domProcessChild.childId;
+  });
+
+  is(id1, id2, "childID for example.com subframes should match");
+});
+
+</script>
+</body>
+</html>