1 files changed, 17 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_channel_long_domain.js b/netwerk/test/unit/test_channel_long_domain.js
new file mode 100644
index 0000000000..1aa59412b3
--- /dev/null
+++ b/netwerk/test/unit/test_channel_long_domain.js
@@ -0,0 +1,17 @@
+// Tests that domains longer than 253 characters fail to load when pref is true
+
+add_task(async function test_long_domain_fails() {
+  Services.prefs.setBoolPref("network.dns.limit_253_chars", true);
+  let domain = "http://" + "a".repeat(254);
+
+  let req = await new Promise(resolve => {
+    let chan = NetUtil.newChannel({
+      uri: domain,
+      loadUsingSystemPrincipal: true,
+    });
+    chan.asyncOpen(new ChannelListener(resolve, null, CL_EXPECT_FAILURE));
+  });
+  Assert.equal(req.status, Cr.NS_ERROR_UNKNOWN_HOST, "Request should fail");
+
+  Services.prefs.clearUserPref("network.dns.limit_253_chars");
+});