From 409f8fb5fb33b1aa8006ddf82ef82380e1924d16 Mon Sep 17 00:00:00 2001
From: Sergi Delgado Segura <sergi.delgado.s@gmail.com>
Date: Mon, 14 Oct 2019 16:58:31 +0100
Subject: [PATCH] Adds Watcher unit tests

---
 test/unit/test_watcher.py | 132 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 test/unit/test_watcher.py

diff --git a/test/unit/test_watcher.py b/test/unit/test_watcher.py
new file mode 100644
index 0000000..5b1e308
--- /dev/null
+++ b/test/unit/test_watcher.py
@@ -0,0 +1,132 @@
+import pytest
+import logging
+from os import urandom
+from time import sleep
+from uuid import uuid4
+from hashlib import sha256
+from threading import Thread
+from queue import Queue, Empty
+
+from pisa import bitcoin_cli
+from pisa.watcher import Watcher
+from pisa.conf import EXPIRY_DELTA
+from pisa.responder import Responder
+from pisa.conf import MAX_APPOINTMENTS
+from pisa.appointment import Appointment
+from pisa.tools import check_txid_format
+from test.simulator.bitcoind_sim import TIME_BETWEEN_BLOCKS
+
+logging.getLogger().disabled = True
+APPOINTMENTS = 5
+
+
+@pytest.fixture(scope="module")
+def watcher():
+    return Watcher()
+
+
+def create_appointment(locator=None):
+    if locator is None:
+        locator = urandom(32).hex()
+    start_time = bitcoin_cli.getblockcount() + 1
+    end_time = start_time + 1
+    dispute_delta = 20
+    encrypted_blob_data = urandom(100).hex()
+    cipher = "AES-GCM-128"
+    hash_function = "SHA256"
+
+    return Appointment(locator, start_time, end_time, dispute_delta, encrypted_blob_data, cipher, hash_function)
+
+
+def create_appointments(n):
+    locator_uuid_map = dict()
+    appointments = dict()
+    txids = []
+
+    for i in range(n):
+        txid = urandom(32)
+        uuid = uuid4().hex
+        locator = sha256(txid).hexdigest()
+
+        appointments[uuid] = create_appointment(locator)
+        locator_uuid_map[locator] = [uuid]
+        txids.append(txid.hex())
+
+    return appointments, locator_uuid_map, txids
+
+
+def test_init(watcher):
+    assert type(watcher.appointments) is dict and len(watcher.appointments) == 0
+    assert type(watcher.locator_uuid_map) is dict and len(watcher.locator_uuid_map) == 0
+    assert watcher.block_queue is None
+    assert watcher.asleep is True
+    assert watcher.max_appointments == MAX_APPOINTMENTS
+    assert watcher.zmq_subscriber is None
+    assert type(watcher.responder) is Responder
+
+
+def test_add_appointment(run_bitcoind, watcher):
+    # The watcher automatically fire do_watch and do_subscribe on adding an appointment if it is asleep (initial state).
+    # Avoid this by setting the state to awake.
+    watcher.asleep = False
+
+    # We should be able to add appointments up to the limit
+    for _ in range(10):
+        added_appointment = watcher.add_appointment(create_appointment())
+
+        assert added_appointment is True
+
+
+def test_add_too_many_appointments(watcher):
+    # Any appointment on top of those should fail
+    watcher.appointments = dict()
+
+    for _ in range(MAX_APPOINTMENTS):
+        added_appointment = watcher.add_appointment(create_appointment())
+
+        assert added_appointment is True
+
+    added_appointment = watcher.add_appointment(create_appointment())
+
+    assert added_appointment is False
+
+
+def test_do_subscribe(watcher):
+    watcher.block_queue = Queue()
+
+    zmq_thread = Thread(target=watcher.do_subscribe)
+    zmq_thread.daemon = True
+    zmq_thread.start()
+
+    try:
+        block_hash = watcher.block_queue.get(timeout=MAX_APPOINTMENTS)
+        assert check_txid_format(block_hash)
+
+    except Empty:
+        assert False
+
+
+def test_do_watch(watcher):
+    # We will wipe all the previous data and add 5 appointments
+    watcher.appointments, watcher.locator_uuid_map, txids = create_appointments(APPOINTMENTS)
+
+    watch_thread = Thread(target=watcher.do_watch)
+    watch_thread.daemon = True
+    watch_thread.start()
+
+    # Broadcast the first two
+    for txid in txids[:2]:
+        bitcoin_cli.sendrawtransaction(txid)
+
+    # After leaving some time for the block to be mined and processed, the number of appointments should have reduced
+    # by two
+    sleep(TIME_BETWEEN_BLOCKS*2)
+    assert len(watcher.appointments) == APPOINTMENTS - 2
+
+    # The rest of appointments will timeout after the end (2) + EXPIRY_DELTA
+    # Wait for an additional block to be safe
+
+    sleep((EXPIRY_DELTA + 2 + 1) * TIME_BETWEEN_BLOCKS)
+
+    assert len(watcher.appointments) == 0
+    assert watcher.asleep is True