diff options
Diffstat (limited to 'activerecord/test/cases/transaction_isolation_test.rb')
-rw-r--r-- | activerecord/test/cases/transaction_isolation_test.rb | 152 |
1 files changed, 72 insertions, 80 deletions
diff --git a/activerecord/test/cases/transaction_isolation_test.rb b/activerecord/test/cases/transaction_isolation_test.rb index a396da6645..f89c26532d 100644 --- a/activerecord/test/cases/transaction_isolation_test.rb +++ b/activerecord/test/cases/transaction_isolation_test.rb @@ -1,113 +1,105 @@ require 'cases/helper' -class TransactionIsolationUnsupportedTest < ActiveRecord::TestCase - self.use_transactional_fixtures = false +unless ActiveRecord::Base.connection.supports_transaction_isolation? + class TransactionIsolationUnsupportedTest < ActiveRecord::TestCase + self.use_transactional_fixtures = false - class Tag < ActiveRecord::Base - end - - setup do - if ActiveRecord::Base.connection.supports_transaction_isolation? - skip "database supports transaction isolation; test is irrelevant" + class Tag < ActiveRecord::Base end - end - test "setting the isolation level raises an error" do - assert_raises(ActiveRecord::TransactionIsolationError) do - Tag.transaction(isolation: :serializable) { } + test "setting the isolation level raises an error" do + assert_raises(ActiveRecord::TransactionIsolationError) do + Tag.transaction(isolation: :serializable) { } + end end end end -class TransactionIsolationTest < ActiveRecord::TestCase - self.use_transactional_fixtures = false - - class Tag < ActiveRecord::Base - self.table_name = 'tags' - end - - class Tag2 < ActiveRecord::Base - self.table_name = 'tags' - end +if ActiveRecord::Base.connection.supports_transaction_isolation? + class TransactionIsolationTest < ActiveRecord::TestCase + self.use_transactional_fixtures = false - setup do - unless ActiveRecord::Base.connection.supports_transaction_isolation? - skip "database does not support setting transaction isolation" + class Tag < ActiveRecord::Base + self.table_name = 'tags' end - Tag.establish_connection 'arunit' - Tag2.establish_connection 'arunit' - Tag.destroy_all - end - - # It is impossible to properly test read uncommitted. The SQL standard only - # specifies what must not happen at a certain level, not what must happen. At - # the read uncommitted level, there is nothing that must not happen. - test "read uncommitted" do - unless ActiveRecord::Base.connection.transaction_isolation_levels.include?(:read_uncommitted) - skip "database does not support read uncommitted isolation level" + class Tag2 < ActiveRecord::Base + self.table_name = 'tags' end - Tag.transaction(isolation: :read_uncommitted) do - assert_equal 0, Tag.count - Tag2.create - assert_equal 1, Tag.count + + setup do + Tag.establish_connection :arunit + Tag2.establish_connection :arunit + Tag.destroy_all end - end - # We are testing that a dirty read does not happen - test "read committed" do - Tag.transaction(isolation: :read_committed) do - assert_equal 0, Tag.count + # It is impossible to properly test read uncommitted. The SQL standard only + # specifies what must not happen at a certain level, not what must happen. At + # the read uncommitted level, there is nothing that must not happen. + if ActiveRecord::Base.connection.transaction_isolation_levels.include?(:read_uncommitted) + test "read uncommitted" do + Tag.transaction(isolation: :read_uncommitted) do + assert_equal 0, Tag.count + Tag2.create + assert_equal 1, Tag.count + end + end + end - Tag2.transaction do - Tag2.create + # We are testing that a dirty read does not happen + test "read committed" do + Tag.transaction(isolation: :read_committed) do assert_equal 0, Tag.count + + Tag2.transaction do + Tag2.create + assert_equal 0, Tag.count + end end + + assert_equal 1, Tag.count end - assert_equal 1, Tag.count - end + # We are testing that a nonrepeatable read does not happen + if ActiveRecord::Base.connection.transaction_isolation_levels.include?(:repeatable_read) + test "repeatable read" do + tag = Tag.create(name: 'jon') - # We are testing that a nonrepeatable read does not happen - test "repeatable read" do - unless ActiveRecord::Base.connection.transaction_isolation_levels.include?(:repeatable_read) - skip "database does not support repeatable read isolation level" - end - tag = Tag.create(name: 'jon') + Tag.transaction(isolation: :repeatable_read) do + tag.reload + Tag2.find(tag.id).update(name: 'emily') - Tag.transaction(isolation: :repeatable_read) do - tag.reload - Tag2.find(tag.id).update_attributes(name: 'emily') + tag.reload + assert_equal 'jon', tag.name + end - tag.reload - assert_equal 'jon', tag.name + tag.reload + assert_equal 'emily', tag.name + end end - tag.reload - assert_equal 'emily', tag.name - end - - # We are only testing that there are no errors because it's too hard to - # test serializable. Databases behave differently to enforce the serializability - # constraint. - test "serializable" do - Tag.transaction(isolation: :serializable) do - Tag.create + # We are only testing that there are no errors because it's too hard to + # test serializable. Databases behave differently to enforce the serializability + # constraint. + test "serializable" do + Tag.transaction(isolation: :serializable) do + Tag.create + end end - end - test "setting isolation when joining a transaction raises an error" do - Tag.transaction do - assert_raises(ActiveRecord::TransactionIsolationError) do - Tag.transaction(isolation: :serializable) { } + test "setting isolation when joining a transaction raises an error" do + Tag.transaction do + assert_raises(ActiveRecord::TransactionIsolationError) do + Tag.transaction(isolation: :serializable) { } + end end end - end - test "setting isolation when starting a nested transaction raises error" do - Tag.transaction do - assert_raises(ActiveRecord::TransactionIsolationError) do - Tag.transaction(requires_new: true, isolation: :serializable) { } + test "setting isolation when starting a nested transaction raises error" do + Tag.transaction do + assert_raises(ActiveRecord::TransactionIsolationError) do + Tag.transaction(requires_new: true, isolation: :serializable) { } + end end end end |