cic-eth: Make nonce separate task

apps/cic-eth/tests/unit/db/test_nonce_db.py

@@ -1,8 +1,29 @@
 # third-party imports
 import pytest
+import uuid
 
 # local imports
-from cic_eth.db.models.nonce import Nonce
+from cic_eth.db.models.nonce import (
+        Nonce,
+        NonceReservation,
+        )
+from cic_eth.error import (
+        InitializationError,
+        IntegrityError,
+        )
+
+
+def test_nonce_init(
+        init_database,
+        eth_empty_accounts,
+        ):
+
+    nonce = Nonce.init(eth_empty_accounts[0], 42, session=init_database)
+    init_database.commit()
+
+    with pytest.raises(InitializationError):
+        nonce = Nonce.init(eth_empty_accounts[0], 42, session=init_database)
+
 
 def test_nonce_increment(
         init_database,
@@ -10,11 +31,46 @@ def test_nonce_increment(
         database_engine,
         ):
 
-#    if database_engine[:6] == 'sqlite':
-#        pytest.skip('sqlite cannot lock tables which is required for this test, skipping')
-
     nonce = Nonce.next(eth_empty_accounts[0], 3)
     assert nonce == 3
 
     nonce = Nonce.next(eth_empty_accounts[0], 3)
     assert nonce == 4
+
+
+def test_nonce_reserve(
+        init_database,
+        eth_empty_accounts,
+    ):
+   
+    nonce = Nonce.init(eth_empty_accounts[0], 42, session=init_database)
+    init_database.commit()
+    uu = uuid.uuid4()
+    nonce = NonceReservation.next(eth_empty_accounts[0], str(uu), session=init_database)
+    init_database.commit()
+    assert nonce == 42
+
+    q = init_database.query(Nonce)
+    q = q.filter(Nonce.address_hex==eth_empty_accounts[0])
+    o = q.first()
+    assert o.nonce == 43
+
+    nonce = NonceReservation.release(str(uu))
+    init_database.commit()
+    assert nonce == 42
+
+    q = init_database.query(NonceReservation)
+    q = q.filter(NonceReservation.key==str(uu))
+    o = q.first()
+    assert o == None
+
+
+def test_nonce_reserve_integrity(
+        init_database,
+        eth_empty_accounts,
+        ):
+
+    uu = uuid.uuid4()
+    nonce = Nonce.init(eth_empty_accounts[0], 42, session=init_database)
+    with pytest.raises(IntegrityError):
+        NonceReservation.release(str(uu))