1 files changed, 40 insertions, 0 deletions
diff --git a/toolkit/profile/xpcshell/test_conflict_installs.js b/toolkit/profile/xpcshell/test_conflict_installs.js
new file mode 100644
index 0000000000..741e7ed70f
--- /dev/null
+++ b/toolkit/profile/xpcshell/test_conflict_installs.js
@@ -0,0 +1,40 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * Tests that the profile service refuses to flush when the install.ini file
+ * has been modified.
+ */
+
+function check_unchanged(service) {
+  Assert.ok(
+    !service.isListOutdated,
+    "Should not have detected a modification."
+  );
+  try {
+    service.flush();
+    Assert.ok(true, "Should have flushed.");
+  } catch (e) {
+    Assert.ok(false, "Should have succeeded flushing.");
+  }
+}
+
+add_task(async () => {
+  let service = getProfileService();
+
+  Assert.ok(!service.isListOutdated, "Should not be modified yet.");
+
+  let installsini = gDataHome.clone();
+  installsini.append("installs.ini");
+
+  Assert.ok(!installsini.exists(), "File should not exist yet.");
+  installsini.create(Ci.nsIFile.NORMAL_FILE_TYPE, 0o644);
+
+  installsini.remove(false);
+  // We have to do profile selection to actually have any install data.
+  selectStartupProfile();
+  check_unchanged(service);
+
+  // We can't reset the modification time back to exactly what it was, so I
+  // guess we can't do much more here :(
+});