1 files changed, 105 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_dns_offline.js b/netwerk/test/unit/test_dns_offline.js
new file mode 100644
index 0000000000..db9c436292
--- /dev/null
+++ b/netwerk/test/unit/test_dns_offline.js
@@ -0,0 +1,105 @@
+"use strict";
+
+var ioService = Services.io;
+var prefs = Services.prefs;
+var mainThread = Services.tm.currentThread;
+
+var listener1 = {
+  onLookupComplete(inRequest, inRecord, inStatus) {
+    Assert.equal(inStatus, Cr.NS_ERROR_OFFLINE);
+    test2();
+    do_test_finished();
+  },
+};
+
+var listener2 = {
+  onLookupComplete(inRequest, inRecord, inStatus) {
+    Assert.equal(inStatus, Cr.NS_OK);
+    inRecord.QueryInterface(Ci.nsIDNSAddrRecord);
+    var answer = inRecord.getNextAddrAsString();
+    Assert.ok(answer == "127.0.0.1" || answer == "::1");
+    test3();
+    do_test_finished();
+  },
+};
+
+var listener3 = {
+  onLookupComplete(inRequest, inRecord, inStatus) {
+    Assert.equal(inStatus, Cr.NS_OK);
+    inRecord.QueryInterface(Ci.nsIDNSAddrRecord);
+    var answer = inRecord.getNextAddrAsString();
+    Assert.ok(answer == "127.0.0.1" || answer == "::1");
+    cleanup();
+    do_test_finished();
+  },
+};
+
+const defaultOriginAttributes = {};
+
+function run_test() {
+  do_test_pending();
+  prefs.setBoolPref("network.dns.offline-localhost", false);
+  // We always resolve localhost as it's hardcoded without the following pref:
+  prefs.setBoolPref("network.proxy.allow_hijacking_localhost", true);
+  ioService.offline = true;
+  try {
+    Services.dns.asyncResolve(
+      "localhost",
+      Ci.nsIDNSService.RESOLVE_TYPE_DEFAULT,
+      0,
+      null, // resolverInfo
+      listener1,
+      mainThread,
+      defaultOriginAttributes
+    );
+  } catch (e) {
+    Assert.equal(e.result, Cr.NS_ERROR_OFFLINE);
+    test2();
+    do_test_finished();
+  }
+}
+
+function test2() {
+  do_test_pending();
+  prefs.setBoolPref("network.dns.offline-localhost", true);
+  ioService.offline = false;
+  ioService.offline = true;
+  // we need to let the main thread run and apply the changes
+  do_timeout(0, test2Continued);
+}
+
+function test2Continued() {
+  Services.dns.asyncResolve(
+    "localhost",
+    Ci.nsIDNSService.RESOLVE_TYPE_DEFAULT,
+    0,
+    null, // resolverInfo
+    listener2,
+    mainThread,
+    defaultOriginAttributes
+  );
+}
+
+function test3() {
+  do_test_pending();
+  ioService.offline = false;
+  // we need to let the main thread run and apply the changes
+  do_timeout(0, test3Continued);
+}
+
+function test3Continued() {
+  Services.dns.asyncResolve(
+    "localhost",
+    Ci.nsIDNSService.RESOLVE_TYPE_DEFAULT,
+    0,
+    null, // resolverInfo
+    listener3,
+    mainThread,
+    defaultOriginAttributes
+  );
+}
+
+function cleanup() {
+  prefs.clearUserPref("network.dns.offline-localhost");
+  prefs.clearUserPref("network.proxy.allow_hijacking_localhost");
+}