async def METHOD_NAME(self):
    """Test initializer and type."""
    assert (
        TestV20CredOffer.CRED_OFFER.credential_preview == TestV20CredOffer.preview
    )
    assert (
        TestV20CredOffer.CRED_OFFER.offers_attach[0].content
        == TestV20CredOffer.indy_offer
    )
    assert TestV20CredOffer.CRED_OFFER.attachment() == TestV20CredOffer.indy_offer
    assert TestV20CredOffer.CRED_OFFER._type == DIDCommPrefix.qualify_current(
        CRED_20_OFFER
    )