1 files changed, 50 insertions, 0 deletions
diff --git a/spec/lib/gitlab/background_migration/backfill_namespace_id_for_namespace_route_spec.rb b/spec/lib/gitlab/background_migration/backfill_namespace_id_for_namespace_route_spec.rb
new file mode 100644
index 00000000000..b821efcadb0
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/backfill_namespace_id_for_namespace_route_spec.rb
@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Gitlab::BackgroundMigration::BackfillNamespaceIdForNamespaceRoute, :migration, schema: 20220120123800 do
+  let(:migration) { described_class.new }
+  let(:namespaces_table) { table(:namespaces) }
+  let(:projects_table) { table(:projects) }
+  let(:routes_table) { table(:routes) }
+
+  let(:table_name) { 'routes' }
+  let(:batch_column) { :id }
+  let(:sub_batch_size) { 200 }
+  let(:pause_ms) { 0 }
+
+  let(:namespace1) { namespaces_table.create!(name: 'namespace1', path: 'namespace1', type: 'User') }
+  let(:namespace2) { namespaces_table.create!(name: 'namespace2', path: 'namespace2', type: 'Group') }
+  let(:namespace3) { namespaces_table.create!(name: 'namespace3', path: 'namespace3', type: 'Group') }
+  let(:namespace4) { namespaces_table.create!(name: 'namespace4', path: 'namespace4', type: 'Group') }
+  let(:project1) { projects_table.create!(name: 'project1', namespace_id: namespace1.id) }
+
+  subject(:perform_migration) { migration.perform(1, 10, table_name, batch_column, sub_batch_size, pause_ms) }
+
+  before do
+    routes_table.create!(id: 1, name: 'test1', path: 'test1', source_id: namespace1.id,
+                         source_type: namespace1.class.sti_name)
+    routes_table.create!(id: 2, name: 'test2', path: 'test2', source_id: namespace2.id,
+                         source_type: namespace2.class.sti_name)
+    routes_table.create!(id: 5, name: 'test3', path: 'test3', source_id: project1.id,
+                         source_type: project1.class.sti_name) # should be ignored - project route
+    routes_table.create!(id: 6, name: 'test4', path: 'test4', source_id: non_existing_record_id,
+                         source_type: namespace3.class.sti_name) # should be ignored - invalid source_id
+    routes_table.create!(id: 10, name: 'test5', path: 'test5', source_id: namespace3.id,
+                         source_type: namespace3.class.sti_name)
+    routes_table.create!(id: 11, name: 'test6', path: 'test6', source_id: namespace4.id,
+                         source_type: namespace4.class.sti_name) # should be ignored - outside the scope
+  end
+
+  it 'backfills `type` for the selected records', :aggregate_failures do
+    perform_migration
+
+    expect(routes_table.where.not(namespace_id: nil).pluck(:id)).to match_array([1, 2, 10])
+  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