1 files changed, 53 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/batching_strategies/backfill_project_namespace_per_group_batching_strategy_spec.rb b/spec/lib/gitlab/background_migration/batching_strategies/backfill_project_namespace_per_group_batching_strategy_spec.rb
new file mode 100644
index 00000000000..7b8a466b37c
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/batching_strategies/backfill_project_namespace_per_group_batching_strategy_spec.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::BatchingStrategies::BackfillProjectNamespacePerGroupBatchingStrategy, '#next_batch' do
+  let!(:namespaces) { table(:namespaces) }
+  let!(:projects) { table(:projects) }
+  let!(:background_migrations) { table(:batched_background_migrations) }
+
+  let!(:namespace1) { namespaces.create!(name: 'batchtest1', type: 'Group', path: 'batch-test1') }
+  let!(:namespace2) { namespaces.create!(name: 'batchtest2', type: 'Group', parent_id: namespace1.id, path: 'batch-test2') }
+  let!(:namespace3) { namespaces.create!(name: 'batchtest3', type: 'Group', parent_id: namespace2.id, path: 'batch-test3') }
+
+  let!(:project1) { projects.create!(name: 'project1', path: 'project1', namespace_id: namespace1.id, visibility_level: 20) }
+  let!(:project2) { projects.create!(name: 'project2', path: 'project2', namespace_id: namespace2.id, visibility_level: 20) }
+  let!(:project3) { projects.create!(name: 'project3', path: 'project3', namespace_id: namespace3.id, visibility_level: 20) }
+  let!(:project4) { projects.create!(name: 'project4', path: 'project4', namespace_id: namespace3.id, visibility_level: 20) }
+  let!(:batching_strategy) { described_class.new }
+
+  let(:job_arguments) { [namespace1.id, 'up'] }
+
+  context 'when starting on the first batch' do
+    it 'returns the bounds of the next batch' do
+      batch_bounds = batching_strategy.next_batch(:projects, :id, batch_min_value: project1.id, batch_size: 3, job_arguments: job_arguments)
+
+      expect(batch_bounds).to match_array([project1.id, project3.id])
+    end
+  end
+
+  context 'when additional batches remain' do
+    it 'returns the bounds of the next batch' do
+      batch_bounds = batching_strategy.next_batch(:projects, :id, batch_min_value: project2.id, batch_size: 3, job_arguments: job_arguments)
+
+      expect(batch_bounds).to match_array([project2.id, project4.id])
+    end
+  end
+
+  context 'when on the final batch' do
+    it 'returns the bounds of the next batch' do
+      batch_bounds = batching_strategy.next_batch(:projects, :id, batch_min_value: project4.id, batch_size: 3, job_arguments: job_arguments)
+
+      expect(batch_bounds).to match_array([project4.id, project4.id])
+    end
+  end
+
+  context 'when no additional batches remain' do
+    it 'returns nil' do
+      batch_bounds = batching_strategy.next_batch(:projects, :id, batch_min_value: project4.id + 1, batch_size: 1, job_arguments: job_arguments)
+
+      expect(batch_bounds).to be_nil
+    end
+  end
+end