Process one installment at a time in background jobs

Instead of attempting to process multiple installments at a time, which
increases the chances something might go wrong, we are now only processing
one installment at a time.

This also improves the extension's performance, because the installments
can be processed in parallel.

1 files changed, 11 insertions, 0 deletions

diff --git a/spec/jobs/solidus_subscriptions/process_installment_job_spec.rb b/spec/jobs/solidus_subscriptions/process_installment_job_spec.rb
new file mode 100644
index 0000000..4a33819
--- /dev/null
+++ b/spec/jobs/solidus_subscriptions/process_installment_job_spec.rb
@@ -0,0 +1,11 @@
+RSpec.describe SolidusSubscriptions::ProcessInstallmentJob do
+  it 'processes checkout for the installment' do
+    installment = build_stubbed(:installment)
+    checkout = instance_spy(SolidusSubscriptions::Checkout)
+    allow(SolidusSubscriptions::Checkout).to receive(:new).with(installment).and_return(checkout)
+
+    described_class.perform_now(installment)
+
+    expect(checkout).to have_received(:process)
+  end
+end