Tx model: Add test for empty inputs

test_transaction.py

@@ -0,0 +1,43 @@
+# TODO: Make sense of this test
+def test_init_transaction(b, user_vk):
+    from bigchaindb.transaction import (
+        Fulfillment,
+        Condition,
+        Transaction,
+        TransactionType,
+    )
+    from bigchaindb.util import validate_fulfillments
+
+    ffill = Fulfillment([user_vk])
+    cond = Condition([user_vk])
+    tx = Transaction([ffill], [cond], TransactionType.CREATE)
+    tx = tx.to_dict()
+
+    assert tx['transaction']['fulfillments'][0]['owners_before'][0] == b.me
+    # NOTE: Why are we accessing `['']`?
+    assert tx['transaction']['conditions'][0][''][0] == user_vk
+    assert validate_fulfillments(tx)
+
+
+def test_create_tx_with_empty_inputs():
+    from bigchaindb.transaction import (
+        Fulfillment,
+        Condition,
+        Transaction,
+        TransactionType,
+    )
+
+    ffill = Fulfillment([])
+    cond = Condition([])
+    tx = Transaction([ffill], [cond], TransactionType.CREATE).to_dict()
+    assert 'id' in tx
+    assert 'transaction' in tx
+    assert 'version' in tx
+    assert 'fulfillments' in tx['transaction']
+    assert 'conditions' in tx['transaction']
+    assert 'operation' in tx['transaction']
+    assert 'timestamp' in tx['transaction']
+    assert 'data' in tx['transaction']
+    assert len(tx['transaction']['fulfillments']) == 1
+    assert tx['transaction']['fulfillments'][0] == {
+        'owners_before': [], 'input': None, 'fulfillment': None, 'fid': 0}