1 files changed, 41 insertions, 0 deletions
diff --git a/dom/security/test/general/browser_test_assert_systemprincipal_documents.js b/dom/security/test/general/browser_test_assert_systemprincipal_documents.js
new file mode 100644
index 0000000000..8804e85b2c
--- /dev/null
+++ b/dom/security/test/general/browser_test_assert_systemprincipal_documents.js
@@ -0,0 +1,41 @@
+//"use strict"
+
+const kTestPath = getRootDirectory(gTestPath);
+const kTestURI = kTestPath + "file_assert_systemprincipal_documents.html";
+
+add_setup(async function () {
+  // We expect the assertion in function
+  // CheckSystemPrincipalLoads as defined in
+  // file dom/security/nsContentSecurityManager.cpp
+  SimpleTest.expectAssertions(1);
+
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["security.disallow_non_local_systemprincipal_in_tests", true],
+      ["security.allow_unsafe_parent_loads", true],
+    ],
+  });
+});
+
+add_task(async function open_test_iframe_in_tab() {
+  // This looks at the iframe (load type SUBDOCUMENT)
+  await BrowserTestUtils.withNewTab(
+    { gBrowser, url: kTestURI },
+    async browser => {
+      await SpecialPowers.spawn(browser, [], async function () {
+        let outerPrincipal = content.document.nodePrincipal;
+        ok(
+          outerPrincipal.isSystemPrincipal,
+          "Sanity: Using SystemPrincipal for test file on chrome://"
+        );
+        const iframeDoc =
+          content.document.getElementById("testframe").contentDocument;
+        is(
+          iframeDoc.body.innerHTML,
+          "",
+          "iframe with systemprincipal should be empty document"
+        );
+      });
+    }
+  );
+});