Add basic Asset model

test_transaction.py

@@ -378,6 +378,48 @@ def test_invalid_fulfillment_initialization(user_ffill, user_pub):
         Fulfillment(user_ffill, [], tx_input='somethingthatiswrong')
 
 
+def test_asset_invalid_asset_initialization():
+    from bigchaindb_common.transaction import Asset
+
+    with raises(TypeError):
+        Asset(data='some wrong type')
+
+
+def test_invalid_asset_comparison(data, data_id):
+    from bigchaindb_common.transaction import Asset
+
+    assert Asset(data, data_id) != 'invalid comparison'
+
+
+def test_asset_serialization(data, data_id):
+    from bigchaindb_common.transaction import Asset
+
+    expected = {
+        'id': data_id,
+        'divisible': False,
+        'updatable': False,
+        'refillable': False,
+        'data': data,
+    }
+    asset = Asset(data, data_id)
+    assert asset.to_dict() == expected
+
+
+def test_asset_deserialization(data, data_id):
+    from bigchaindb_common.transaction import Asset
+
+    asset_dict = {
+        'id': data_id,
+        'divisible': False,
+        'updatable': False,
+        'refillable': False,
+        'data': data,
+    }
+    asset = Asset.from_dict(asset_dict)
+    expected = Asset(data, data_id)
+    assert asset == expected
+
+
 def test_invalid_metadata_initialization():
     from bigchaindb_common.transaction import Metadata