1 files changed, 120 insertions, 0 deletions
diff --git a/spec/migrations/20230726144458_swap_notes_id_to_bigint_for_self_managed_spec.rb b/spec/migrations/20230726144458_swap_notes_id_to_bigint_for_self_managed_spec.rb
new file mode 100644
index 00000000000..b4552cebc58
--- /dev/null
+++ b/spec/migrations/20230726144458_swap_notes_id_to_bigint_for_self_managed_spec.rb
@@ -0,0 +1,120 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!
+
+RSpec.describe SwapNotesIdToBigintForSelfManaged, feature_category: :database do
+  let(:connection) { described_class.new.connection }
+
+  shared_examples 'column `id_convert_to_bigint` is already dropped' do
+    before do
+      connection.execute('ALTER TABLE notes ALTER COLUMN id TYPE bigint')
+      connection.execute('ALTER TABLE notes DROP COLUMN IF EXISTS id_convert_to_bigint')
+    end
+
+    after do
+      connection.execute('ALTER TABLE notes DROP COLUMN IF EXISTS id_convert_to_bigint')
+    end
+
+    it 'does not swaps the columns' do
+      disable_migrations_output do
+        reversible_migration do |migration|
+          migration.before -> {
+            notes_table.reset_column_information
+
+            expect(notes_table.columns.find { |c| c.name == 'id' }.sql_type).to eq('bigint')
+            expect(notes_table.columns.find { |c| c.name == 'id_convert_to_bigint' }).to be_nil
+          }
+
+          migration.after -> {
+            notes_table.reset_column_information
+
+            expect(notes_table.columns.find { |c| c.name == 'id' }.sql_type).to eq('bigint')
+            expect(notes_table.columns.find { |c| c.name == 'id_convert_to_bigint' }).to be_nil
+          }
+        end
+      end
+    end
+  end
+
+  describe '#up' do
+    let!(:notes_table) { table(:notes) }
+
+    before do
+      # rubocop:disable RSpec/AnyInstanceOf
+      allow_any_instance_of(described_class).to(
+        receive(:com_or_dev_or_test_but_not_jh?).and_return(com_or_dev_or_test_but_not_jh?)
+      )
+      # rubocop:enable RSpec/AnyInstanceOf
+    end
+
+    context 'when GitLab.com, dev, or test' do
+      let(:com_or_dev_or_test_but_not_jh?) { true }
+
+      it_behaves_like 'column `id_convert_to_bigint` is already dropped'
+    end
+
+    context 'when self-managed instance with the `id_convert_to_bigint` column already dropped' do
+      let(:com_or_dev_or_test_but_not_jh?) { false }
+
+      it_behaves_like 'column `id_convert_to_bigint` is already dropped'
+    end
+
+    context 'when self-managed instance columns already swapped' do
+      let(:com_or_dev_or_test_but_not_jh?) { false }
+
+      before do
+        connection.execute('ALTER TABLE notes ALTER COLUMN id TYPE bigint')
+        connection.execute('ALTER TABLE notes ADD COLUMN IF NOT EXISTS id_convert_to_bigint integer')
+
+        disable_migrations_output { migrate! }
+      end
+
+      after do
+        connection.execute('ALTER TABLE notes DROP COLUMN IF EXISTS id_convert_to_bigint')
+      end
+
+      it 'does not swaps the columns' do
+        expect(notes_table.columns.find { |c| c.name == 'id' }.sql_type).to eq('bigint')
+        expect(notes_table.columns.find { |c| c.name == 'id_convert_to_bigint' }.sql_type).to eq('integer')
+      end
+    end
+
+    context 'when self-managed instance' do
+      let(:com_or_dev_or_test_but_not_jh?) { false }
+
+      before do
+        connection.execute('ALTER TABLE notes ALTER COLUMN id TYPE integer')
+        connection.execute('ALTER TABLE notes ADD COLUMN IF NOT EXISTS id_convert_to_bigint bigint')
+        connection.execute('ALTER TABLE notes ALTER COLUMN id_convert_to_bigint TYPE bigint')
+        connection.execute('DROP INDEX IF EXISTS index_notes_on_id_convert_to_bigint CASCADE')
+        connection.execute('CREATE OR REPLACE FUNCTION trigger_080e73845bfd() RETURNS trigger LANGUAGE plpgsql AS $$
+          BEGIN NEW."id_convert_to_bigint" := NEW."id"; RETURN NEW; END; $$;')
+      end
+
+      after do
+        connection.execute('ALTER TABLE notes DROP COLUMN IF EXISTS id_convert_to_bigint')
+      end
+
+      it 'swaps the columns' do
+        disable_migrations_output do
+          reversible_migration do |migration|
+            migration.before -> {
+              notes_table.reset_column_information
+
+              expect(notes_table.columns.find { |c| c.name == 'id' }.sql_type).to eq('integer')
+              expect(notes_table.columns.find { |c| c.name == 'id_convert_to_bigint' }.sql_type).to eq('bigint')
+            }
+
+            migration.after -> {
+              notes_table.reset_column_information
+
+              expect(notes_table.columns.find { |c| c.name == 'id' }.sql_type).to eq('bigint')
+              expect(notes_table.columns.find { |c| c.name == 'id_convert_to_bigint' }.sql_type).to eq('integer')
+            }
+          end
+        end
+      end
+    end
+  end
+end