diff --git a/tests/technical/test_documents_service.py b/tests/technical/test_documents_service.py
index 4ecdda858d9fc33a48adfc27715d88c72b3ff333..9ec0a14a12ea2cdd22ab9576e5287e6d816a1eb8 100644
--- a/tests/technical/test_documents_service.py
+++ b/tests/technical/test_documents_service.py
@@ -43,6 +43,7 @@ async def test_send_more_than_40_sources(
         amount_before_send,
         0,
         "Test comment",
+        0,
     )
     assert transactions[0].comment == "[CHAINED]"
     assert transactions[1].comment == "Test comment"
diff --git a/tests/technical/test_sources_service.py b/tests/technical/test_sources_service.py
index 2cc8c698fc218beb25d6a17eb98738a252b7f425..9cb1d21c642f6b0c2088e9ac8ceb77db107fc365 100644
--- a/tests/technical/test_sources_service.py
+++ b/tests/technical/test_sources_service.py
@@ -83,7 +83,7 @@ async def test_send_tx_then_cancel(
     )
     fake_server_with_blockchain.reject_next_post = True
     await application_with_one_connection.documents_service.send_money(
-        bob_connection, bob.salt, bob.password, alice.key.pubkey, 10, 0, "Test comment"
+        bob_connection, bob.salt, bob.password, alice.key.pubkey, 10, 0, None, 0
     )
     tx_after_send = application_with_one_connection.transactions_service.transfers(
         bob.key.pubkey
diff --git a/tests/technical/test_transactions_service.py b/tests/technical/test_transactions_service.py
index b6b073dffe6d5db3a278a15f0352a0ed6acca160..944f3477e136476cd9f26bcda61ba87a42cb426e 100644
--- a/tests/technical/test_transactions_service.py
+++ b/tests/technical/test_transactions_service.py
@@ -18,7 +18,7 @@ async def test_send_tx_then_validate(
         pubkey=bob.key.pubkey
     )
     await application_with_one_connection.documents_service.send_money(
-        bob_connection, bob.salt, bob.password, alice.key.pubkey, 10, 0, "Test comment"
+        bob_connection, bob.salt, bob.password, alice.key.pubkey, 10, 0, None, 0
     )
     tx_after_send = application_with_one_connection.transactions_service.transfers(
         bob.key.pubkey
diff --git a/tests/unit/services/test_documents.py b/tests/unit/services/test_documents.py
new file mode 100644
index 0000000000000000000000000000000000000000..00084fa94b0ad7d2ce2106ba88303aff979742ec
--- /dev/null
+++ b/tests/unit/services/test_documents.py
@@ -0,0 +1,71 @@
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_lock_mode_0(application_with_one_connection, fake_server, bob, alice):
+    """
+    Test the lock mode 0, Receiver signature
+
+    :param application_with_one_connection:
+    :param fake_server:
+    :param bob:
+    :param alice:
+    :return:
+    """
+    # check money amount in bob account
+    amount = application_with_one_connection.sources_service.amount(bob.key.pubkey)
+    assert amount == 1584
+
+    # create connection to have sources...
+    bob_connection = application_with_one_connection.db.connections_repo.get_one(
+        pubkey=bob.key.pubkey
+    )
+
+    # send transaction
+    (
+        _,
+        sakia_tx_list,
+    ) = await application_with_one_connection.documents_service.send_money(
+        bob_connection, bob.salt, bob.password, alice.key.pubkey, 100, 0, None, 0
+    )
+
+    assert len(sakia_tx_list) == 1
+    assert (
+        "Outputs:\n100:0:SIG(F3HWkYnUSbdpEueosKqzYd1m8ftwojwE2uXR7ScoAVKo)\n"
+        in sakia_tx_list[0].raw
+    )
+
+
+@pytest.mark.asyncio
+async def test_lock_mode_1(application_with_one_connection, fake_server, bob, alice):
+    """
+    Test the lock mode 0, Receiver signature OR (Sender signature AND CSV(one week delay))
+
+    :param application_with_one_connection:
+    :param fake_server:
+    :param bob:
+    :param alice:
+    :return:
+    """
+    # check money amount in bob account
+    amount = application_with_one_connection.sources_service.amount(bob.key.pubkey)
+    assert amount == 1584
+
+    # create connection to have sources...
+    bob_connection = application_with_one_connection.db.connections_repo.get_one(
+        pubkey=bob.key.pubkey
+    )
+
+    # send transaction
+    (
+        _,
+        sakia_tx_list,
+    ) = await application_with_one_connection.documents_service.send_money(
+        bob_connection, bob.salt, bob.password, alice.key.pubkey, 100, 0, None, 1
+    )
+
+    assert len(sakia_tx_list) == 1
+    assert (
+        "Outputs:\n100:0:SIG(F3HWkYnUSbdpEueosKqzYd1m8ftwojwE2uXR7ScoAVKo) || (SIG(GfFUvqaVSgCt6nFDQCAuULWk6K16MUDckeyBJQFcaYj7) && CSV(604800))\n"
+        in sakia_tx_list[0].raw
+    )