Don't override audio_url if it's provided by the user

app/models/broadcast.rb

@@ -157,6 +157,7 @@ def set_call_flow_logic
   def process_audio_file
     return unless audio_file.attached?
     return unless audio_file_blob_changed?
+    return if audio_url.present?
 
     AudioFileProcessorJob.perform_later(self)
   end

spec/requests/open_ews_api/v1/broadcasts_spec.rb

@@ -101,8 +101,8 @@
         }
       )
 
-      stub_request(:get, "https://www.example.com/sample.mp3").to_return(status: 200)
-      allow(AudioFileProcessorJob).to receive(:perform_later).with(broadcast)
+      stub_request(:get, "https://www.example.com/test.mp3")
+        .to_return(status: 200, body: file_fixture("test.mp3"))
 
       set_authorization_header_for(account)
       perform_enqueued_jobs do
@@ -113,7 +113,7 @@
             type: :broadcast,
             attributes: {
               status: "running",
-              audio_url: "https://www.example.com/sample.mp3",
+              audio_url: "https://www.example.com/test.mp3",
               beneficiary_filter: {
                 gender: { eq: "F" }
               }
@@ -126,12 +126,13 @@
       expect(response_body).to match_jsonapi_resource_schema("broadcast")
       expect(json_response.dig("data", "attributes")).to include(
         "status" => "queued",
-        "audio_url" => "https://www.example.com/sample.mp3",
+        "audio_url" => "https://www.example.com/test.mp3",
         "beneficiary_filter" => {
           "gender" => { "eq" => "F" }
         }
       )
       expect(broadcast.reload.status).to eq("running")
+      expect(broadcast.audio_file).to be_attached
       expect(broadcast.beneficiaries).to match_array([ female_beneficiary ])
       expect(broadcast.delivery_attempts.count).to eq(1)
       expect(broadcast.delivery_attempts.first.beneficiary).to eq(female_beneficiary)