Synchronize delivery test fixtures and record the concurrency audit

delivery_reads_linux_test.go

@@ -24,9 +24,10 @@ func TestDeliverReadsLocalBinaryOnceForVerificationAndOnceForUpload(t *testing.T
 	}
 	state := &deliveryBenchmarkServer{commit: build.CandidateCommit, assets: expected}
 	state.reset(false)
-	server := httptest.NewServer(http.HandlerFunc(state.serveHTTP))
+	server := httptest.NewUnstartedServer(http.HandlerFunc(state.serveHTTP))
+	state.baseURL = "http://" + server.Listener.Addr().String()
+	server.Start()
 	defer server.Close()
-	state.baseURL = server.URL
 	result, err := releasekit.Deliver(t.Context(), releasekit.DeliveryRequest{
 		RepositoryDir: repository, Product: "Sample App", Version: build.Version,
 		Destination: facadeDeliveryDestination(server.URL), Prebuilt: &build,