message: added tests for get_claim_offers
diff: from indy import wallet
  from indy.anoncreds import prover_get_claim_offers
  +from indy.error import ErrorCode, IndyError
  from tests.utils import storage, anoncreds
  from tests.utils.wallet import create_and_open_wallet
  @@ -31,3 +32,48 @@ async def test_prover_get_claim_offers_works_for_empty_filter(wallet_handle):
  claim_offers = json.loads(await prover_get_claim_offers(wallet_handle, "{}"))
  assert len(claim_offers) == 3
  +
  +@pytest.mark.asyncio
  +async def test_prover_get_claim_offers_works_for_filter_by_issuer(wallet_handle):
  + claim_offers = json.loads(await prover_get_claim_offers(
  + wallet_handle, '{{"issuer_did":"{}"}}'.format(anoncreds.ISSUER_DID)))
  + assert len(claim_offers) == 2
  + assert {'issuer_did': anoncreds.ISSUER_DID, 'schema_seq_no': 1} in claim_offers
  + assert {'issuer_did': anoncreds.ISSUER_DID, 'schema_seq_no': 2} in claim_offers
  +
  +
  +@pytest.mark.asyncio
  +async def test_prover_get_claim_offers_works_for_filter_by_schema(wallet_handle):
  + claim_offers = json.loads(await prover_get_claim_offers(
  + wallet_handle, '{"schema_seq_no":2}'))
  + assert len(claim_offers) == 2
  + assert {'issuer_did': anoncreds.ISSUER_DID, 'schema_seq_no': 2} in claim_offers
  + assert {'issuer_did': 'CnEDk9HrMnmiHXEV1WFgbVCRteYnPqsJwrTdcZaNhFVW', 'schema_seq_no': 2} in claim_offers
  +
  +
  +@pytest.mark.asyncio
  +async def test_prover_get_claim_offers_works_for_filter_by_issuer_and_schema(wallet_handle):
  + claim_offers = json.loads(await prover_get_claim_offers(
  + wallet_handle, json.dumps(anoncreds.get_claim_offer(anoncreds.ISSUER_DID, 1))))
  + assert len(claim_offers) == 1
  + assert {'issuer_did': anoncreds.ISSUER_DID, 'schema_seq_no': 1} in claim_offers
  +
  +
  +@pytest.mark.asyncio
  +async def test_prover_get_claim_offers_works_for_no_results(wallet_handle):
  + claim_offers = json.loads(await prover_get_claim_offers(
  + wallet_handle, '{"schema_seq_no":4}'))
  + assert len(claim_offers) == 0
  +
  +
  +@pytest.mark.asyncio
  +async def test_prover_get_claim_offers_works_for_invalid_wallet_handle(wallet_handle):
  + invalid_wallet_handle = wallet_handle + 100
  +
  + try:
  + await prover_get_claim_offers(invalid_wallet_handle, '{"schema_seq_no":1}')
  + raise Exception("Failed")
  + except Exception as e:
  + assert type(IndyError(ErrorCode.WalletInvalidHandle)) == type(e) and \
  + IndyError(ErrorCode.WalletInvalidHandle).args == e.args
  +
  