1 files changed, 25 insertions, 0 deletions
diff --git a/spec/workers/migrate_external_diffs_worker_spec.rb b/spec/workers/migrate_external_diffs_worker_spec.rb
new file mode 100644
index 00000000000..88d48cad14b
--- /dev/null
+++ b/spec/workers/migrate_external_diffs_worker_spec.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe MigrateExternalDiffsWorker do
+  let(:worker) { described_class.new }
+  let(:diff) { create(:merge_request).merge_request_diff }
+
+  describe '#perform' do
+    it 'migrates the listed diff' do
+      expect_next_instance_of(MergeRequests::MigrateExternalDiffsService) do |instance|
+        expect(instance.diff).to eq(diff)
+        expect(instance).to receive(:execute)
+      end
+
+      worker.perform(diff.id)
+    end
+
+    it 'does nothing if the diff is missing' do
+      diff.destroy
+
+      worker.perform(diff.id)
+    end
+  end
+end