"Domain.build(save:false)" saves immediately

[koji-k]

Hi,
I use Grails 3.3.8 and build-test-data:3.3.1

I worte following Integration test code. comments explain this problem.

def sample () {
    setup:

    assert RoomType.count == 0 // it will be "0". no problem.

    RoomType roomType1 = RoomType.build(save: false)

    assert roomType1.id == null // no problem.

    assert RoomType.count == 0 // this test fails... RoomType.count returns "1"
}

so, Grails's test report shows such as following message.

Condition not satisfied:

RoomType.count == 0 // this test fails... RoomType.count returns "1"
         |     |
         1     false

I think that the following actions are originally correct:

• RomoType.build(save: false) creates a instance of RoomType domain of Grails.
• But not save into data store(I use H2 for Integration test), because be specified save: false in build method.

However, like a above my sample code, that instance saves immediately.

Is this behavior correct? or i understand it wrong?