Merge branch 'backstage/gb/migrations-tests-schema-version' into backstage/gb/migrate-stages-statuses

* backstage/gb/migrations-tests-schema-version:
  Migrate down before each migration unit test
  Disable db_cleaner tables caching in migrations tests
  Extend migrations testing documentation
  Make it possible to provide schema version in tests
  Migrate db schema for context in :migration specs

2 files changed, 16 insertions, 1 deletions

diff --git a/spec/support/db_cleaner.rb b/spec/support/db_cleaner.rb
index 7f5769209bb..b0f520d08e8 100644
--- a/spec/support/db_cleaner.rb
+++ b/spec/support/db_cleaner.rb
@@ -20,7 +20,7 @@ RSpec.configure do |config|
   end
 
   config.before(:each, :migration) do
-    DatabaseCleaner.strategy = :truncation
+    DatabaseCleaner.strategy = :truncation, { cache_tables: false }
   end
 
   config.before(:each) do
diff --git a/spec/support/migrations_helpers.rb b/spec/support/migrations_helpers.rb
index aabdad13047..3e8c6b54c5a 100644
--- a/spec/support/migrations_helpers.rb
+++ b/spec/support/migrations_helpers.rb
@@ -31,6 +31,21 @@ module MigrationsHelpers
     end
   end
 
+  def migration_schema_version
+    self.class.metadata[:schema] || previous_migration.version
+  end
+
+  def schema_migrate_down!
+    ActiveRecord::Migrator
+      .migrate(migrations_paths, migration_schema_version)
+    reset_column_in_migration_models
+  end
+
+  def schema_migrate_up!
+    ActiveRecord::Migrator.migrate(migrations_paths)
+    reset_column_in_migration_models
+  end
+
   def migrate!
     ActiveRecord::Migrator.up(migrations_paths) do |migration|
       migration.name == described_class.name