1 files changed, 55 insertions, 0 deletions
diff --git a/browser/components/doh/test/browser/browser_dirtyEnable.js b/browser/components/doh/test/browser/browser_dirtyEnable.js
new file mode 100644
index 0000000000..c704ca06e6
--- /dev/null
+++ b/browser/components/doh/test/browser/browser_dirtyEnable.js
@@ -0,0 +1,55 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+"use strict";
+
+add_task(setup);
+
+add_task(async function testDirtyEnable() {
+  // Set up a failing environment, pre-set DoH to enabled, and verify that
+  // when the add-on is enabled, it doesn't do anything - DoH remains turned on.
+  setFailingHeuristics();
+  let prefPromise = TestUtils.waitForPrefChange(prefs.DISABLED_PREF);
+  Preferences.set(prefs.NETWORK_TRR_MODE_PREF, 2);
+  Preferences.set(prefs.ENABLED_PREF, true);
+  await prefPromise;
+  is(
+    Preferences.get(prefs.DISABLED_PREF, false),
+    true,
+    "Disabled state recorded."
+  );
+  is(
+    Preferences.get(prefs.BREADCRUMB_PREF),
+    undefined,
+    "Breadcrumb not saved."
+  );
+  is(
+    Preferences.get(prefs.TRR_SELECT_URI_PREF),
+    undefined,
+    "TRR selection not performed."
+  );
+  is(Preferences.get(prefs.NETWORK_TRR_MODE_PREF), 2, "TRR mode preserved.");
+  ensureNoTRRSelectionTelemetry();
+  await ensureNoTRRModeChange(undefined);
+  ensureNoHeuristicsTelemetry();
+
+  // Simulate a network change.
+  simulateNetworkChange();
+  await ensureNoTRRModeChange(undefined);
+  ensureNoHeuristicsTelemetry();
+  is(Preferences.get(prefs.NETWORK_TRR_MODE_PREF), 2, "TRR mode preserved.");
+
+  // Restart the controller for good measure.
+  await restartDoHController();
+  await ensureNoTRRModeChange(undefined);
+  ensureNoTRRSelectionTelemetry();
+  ensureNoHeuristicsTelemetry();
+  is(Preferences.get(prefs.NETWORK_TRR_MODE_PREF), 2, "TRR mode preserved.");
+
+  // Simulate a network change.
+  simulateNetworkChange();
+  await ensureNoTRRModeChange(undefined);
+  is(Preferences.get(prefs.NETWORK_TRR_MODE_PREF), 2, "TRR mode preserved.");
+  ensureNoHeuristicsTelemetry();
+});