diff --git a/spec/files/global_messages/global_message.json b/spec/files/global_messages/global_message.json
new file mode 100644
index 00000000..1d55a3ff
--- /dev/null
+++ b/spec/files/global_messages/global_message.json
@@ -0,0 +1,6 @@
+[
+  {
+    "Title": "\u003Ca href=\"/node/1607\" hreflang=\"en\"\u003ECatalogue Message\u003C/a\u003E",
+    "body": "\u003Cp\u003EThe Library's summer opening hours are in place from Monday 23 December 2024 until Wednesday 1 January 2025 (inclusive). Before planning your visit, check our \u003Ca href=\"https://www.library.gov.au/visit/opening-hours\"\u003Eopening hours\u003C/a\u003E and \u003Ca href=\"https://www.library.gov.au/research/access-collection/temporary-changes-collection-access\"\u003Etemporary changes to collection access\u003C/a\u003E.\u003C/p\u003E"
+  }
+]
\ No newline at end of file
diff --git a/spec/support/webmock.rb b/spec/support/webmock.rb
index 4d55c829..6acdf957 100644
--- a/spec/support/webmock.rb
+++ b/spec/support/webmock.rb
@@ -279,5 +279,16 @@
         }
       )
       .to_return(status: 200, body: email_2fa, headers: {})
+
+    global_message = IO.read("spec/files/global_message.json")
+
+    WebMock.stub_request(:get, "https://www.library.gov.au/catalogue-message")
+           .with(
+             headers: {
+               "Accept" => "application/json",
+               "Accept-Encoding" => "gzip;q=1.0,deflate;q=0.6,identity;q=0.3"
+             }
+           )
+           .to_return(status: 200, body: global_message, headers: {})
   end
 end