Add Delegation/DelegationRole specific tests

Signed-off-by: Martin Vrachev <mvrachev@vmware.com>

tests/test_api.py

@@ -27,7 +27,9 @@
  Timestamp,
  Targets,
  Key,
- Role
+ Role,
+ Delegations,
+ DelegationRole,
 )
 
 from tuf.api.serialization import (
@@ -302,7 +304,7 @@ def test_key_class(self):
  "public": "edcd0a32a07dce33f7c7873aaffbff36d20ea30787574ead335eefd337e4dacd"
  },
  "scheme": "ed25519"
-  },
+ },
  }
  for key_dict in keys.values():
  # Testing that the workflow of deserializing and serializing
@@ -394,6 +396,66 @@ def test_metadata_root(self):
  self.assertNotIn(keyid, root.signed.keys)
 
 
+ def test_delegation_role_class(self):
+ roles = [
+ {
+ "keyids": [
+ "c8022fa1e9b9cb239a6b362bbdffa9649e61ad2cb699d2e4bc4fdf7930a0e64a"
+ ],
+ "name": "role1",
+ "paths": [
+ "file3.txt"
+ ],
+ "terminating": False,
+ "threshold": 1
+ }
+ ]
+ for role in roles:
+ # Testing that the workflow of deserializing and serializing
+ # a delegation role dictionary doesn't change the content.
+ key_obj = DelegationRole.from_dict(role.copy())
+ self.assertEqual(role, key_obj.to_dict())
+
+ # Test creating a DelegationRole object with both "paths" and
+ # "path_hash_prefixes" set.
+ role["path_hash_prefixes"] = "foo"
+ with self.assertRaises(ValueError):
+ DelegationRole.from_dict(role.copy())
+
+ # Test creating DelegationRole without "paths" and
+ # "path_hash_prefixes" set
+ del role["paths"]
+ del role["path_hash_prefixes"]
+ DelegationRole.from_dict(role)
+
+
+ def test_delegation_class(self):
+ roles = [
+ {
+ "keyids": [
+ "c8022fa1e9b9cb239a6b362bbdffa9649e61ad2cb699d2e4bc4fdf7930a0e64a"
+ ],
+ "name": "role1",
+ "paths": [
+ "file3.txt"
+ ],
+ "terminating": False,
+ "threshold": 1
+ }
+ ]
+ keys = {
+ "59a4df8af818e9ed7abe0764c0b47b4240952aa0d179b5b78346c470ac30278d":{
+ "keytype": "ed25519",
+ "keyval": {
+ "public": "edcd0a32a07dce33f7c7873aaffbff36d20ea30787574ead335eefd337e4dacd"
+ },
+ "scheme": "ed25519"
+ },
+ }
+ delegations_dict = {"keys": keys, "roles": roles}
+ delegations = Delegations.from_dict(copy.deepcopy(delegations_dict))
+ self.assertEqual(delegations_dict, delegations.to_dict())
+
 
  def test_metadata_targets(self):
  targets_path = os.path.join(