1 files changed, 50 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/backfill_member_namespace_for_group_members_spec.rb b/spec/lib/gitlab/background_migration/backfill_member_namespace_for_group_members_spec.rb
new file mode 100644
index 00000000000..e1ef12a1479
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/backfill_member_namespace_for_group_members_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::BackfillMemberNamespaceForGroupMembers, :migration, schema: 20220120211832 do
+  let(:migration) { described_class.new }
+  let(:members_table) { table(:members) }
+  let(:namespaces_table) { table(:namespaces) }
+
+  let(:table_name) { 'members' }
+  let(:batch_column) { :id }
+  let(:sub_batch_size) { 100 }
+  let(:pause_ms) { 0 }
+
+  subject(:perform_migration) { migration.perform(1, 10, table_name, batch_column, sub_batch_size, pause_ms) }
+
+  before do
+    namespaces_table.create!(id: 100, name: 'test1', path: 'test1', type: 'Group')
+    namespaces_table.create!(id: 101, name: 'test2', path: 'test2', type: 'Group')
+    namespaces_table.create!(id: 102, name: 'test3', path: 'test3', type: 'Group')
+    namespaces_table.create!(id: 201, name: 'test4', path: 'test4', type: 'Project')
+
+    members_table.create!(id: 1, source_id: 100, source_type: 'Namespace', type: 'GroupMember', member_namespace_id: nil, access_level: 10, notification_level: 3)
+    members_table.create!(id: 2, source_id: 101, source_type: 'Namespace', type: 'GroupMember', member_namespace_id: nil, access_level: 10, notification_level: 3)
+    members_table.create!(id: 3, source_id: 102, source_type: 'Namespace', type: 'GroupMember', member_namespace_id: 102, access_level: 10, notification_level: 3)
+    members_table.create!(id: 4, source_id: 103, source_type: 'Project', type: 'ProjectMember', member_namespace_id: nil, access_level: 10, notification_level: 3)
+    members_table.create!(id: 5, source_id: 104, source_type: 'Project', type: 'ProjectMember', member_namespace_id: 201, access_level: 10, notification_level: 3)
+  end
+
+  it 'backfills `member_namespace_id` for the selected records', :aggregate_failures do
+    expect(members_table.where(type: 'GroupMember', member_namespace_id: nil).count).to eq 2
+    expect(members_table.where(type: 'ProjectMember', member_namespace_id: nil).count).to eq 1
+
+    queries = ActiveRecord::QueryRecorder.new do
+      perform_migration
+    end
+
+    expect(queries.count).to eq(3)
+    expect(members_table.where(type: 'GroupMember', member_namespace_id: nil).count).to eq 0
+    expect(members_table.where(type: 'GroupMember').pluck(:member_namespace_id)).to match_array([100, 101, 102])
+    expect(members_table.where(type: 'ProjectMember', member_namespace_id: nil).count).to eq 1
+    expect(members_table.where(type: 'ProjectMember').pluck(:member_namespace_id)).to match_array([nil, 201])
+  end
+
+  it 'tracks timings of queries' do
+    expect(migration.batch_metrics.timings).to be_empty
+
+    expect { perform_migration }.to change { migration.batch_metrics.timings }
+  end
+end