Rewrite import feature (#21054)

spec/workers/bulk_import_worker_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe BulkImportWorker do
+  subject { described_class.new }
+
+  let(:import) { Fabricate(:bulk_import, state: :scheduled) }
+
+  describe '#perform' do
+    let(:service_double) { instance_double(BulkImportService, call: nil) }
+
+    before do
+      allow(BulkImportService).to receive(:new).and_return(service_double)
+    end
+
+    it 'changes the import\'s state as appropriate' do
+      expect { subject.perform(import.id) }.to change { import.reload.state.to_sym }.from(:scheduled).to(:in_progress)
+    end
+
+    it 'calls BulkImportService' do
+      subject.perform(import.id)
+      expect(service_double).to have_received(:call).with(import)
+    end
+  end
+end