1 files changed, 78 insertions, 0 deletions
diff --git a/spec/migrations/20221220131020_bump_default_partition_id_value_for_ci_tables_spec.rb b/spec/migrations/20221220131020_bump_default_partition_id_value_for_ci_tables_spec.rb
new file mode 100644
index 00000000000..c4bd243e79f
--- /dev/null
+++ b/spec/migrations/20221220131020_bump_default_partition_id_value_for_ci_tables_spec.rb
@@ -0,0 +1,78 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+require_migration!
+
+RSpec.describe BumpDefaultPartitionIdValueForCiTables, :migration, feature_category: :continuous_integration do
+  context 'when on sass' do
+    before do
+      allow(Gitlab).to receive(:com?).and_return(true)
+    end
+
+    it 'changes default values' do
+      reversible_migration do |migration|
+        migration.before -> {
+          expect(default_values).not_to include(101)
+        }
+
+        migration.after -> {
+          expect(default_values).to match_array([101])
+        }
+      end
+    end
+
+    context 'with tables already changed' do
+      before do
+        active_record_base.connection.execute(<<~SQL)
+          ALTER TABLE ci_builds ALTER COLUMN partition_id SET DEFAULT 101
+        SQL
+      end
+
+      after do
+        schema_migrate_down!
+      end
+
+      let(:alter_query) do
+        /ALTER TABLE "ci_builds" ALTER COLUMN "partition_id" SET DEFAULT 101/
+      end
+
+      it 'skips updating already changed tables' do
+        recorder = ActiveRecord::QueryRecorder.new { migrate! }
+
+        expect(recorder.log.any?(alter_query)).to be_falsey
+        expect(default_values).to match_array([101])
+      end
+    end
+  end
+
+  context 'when self-managed' do
+    before do
+      allow(Gitlab).to receive(:com?).and_return(false)
+    end
+
+    it 'does not change default values' do
+      reversible_migration do |migration|
+        migration.before -> {
+          expect(default_values).not_to include(101)
+        }
+
+        migration.after -> {
+          expect(default_values).not_to include(101)
+        }
+      end
+    end
+  end
+
+  def default_values
+    values = described_class::TABLES.flat_map do |table_name, columns|
+      active_record_base
+        .connection
+        .columns(table_name)
+        .select { |column| columns.include?(column.name.to_sym) }
+        .map { |column| column.default&.to_i }
+    end
+
+    values.uniq
+  end
+end