diff --git a/tests/server/test_daemon.py b/tests/server/test_daemon.py
new file mode 100644
index 0000000..2a905a9
--- /dev/null
+++ b/tests/server/test_daemon.py
@@ -0,0 +1,489 @@
+import aiohttp
+import asyncio
+import json
+import logging
+
+import pytest
+
+from aiorpcx import (
+    JSONRPCv1, JSONRPCLoose, RPCError, ignore_after,
+    Request, Batch,
+)
+from electrumx.lib.coins import BitcoinCash, CoinError, Bitzeny
+from electrumx.server.daemon import (
+    Daemon, FakeEstimateFeeDaemon, DaemonError
+)
+
+
+coin = BitcoinCash
+
+# These should be full, canonical URLs
+urls = ['http://rpc_user:rpc_pass@127.0.0.1:8332/',
+        'http://rpc_user:rpc_pass@192.168.0.1:8332/']
+
+
+@pytest.fixture(params=[BitcoinCash, Bitzeny])
+def daemon(request):
+    coin = request.param
+    return coin.DAEMON(coin, ','.join(urls))
+
+
+class ResponseBase(object):
+
+    def __init__(self, headers, status):
+        self.headers = headers
+        self.status = status
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_value, traceback):
+        pass
+
+
+class JSONResponse(ResponseBase):
+
+    def __init__(self, result, msg_id, status=200):
+        super().__init__({'Content-Type': 'application/json'}, status)
+        self.result = result
+        self.msg_id = msg_id
+
+    async def json(self):
+        if isinstance(self.msg_id, int):
+            message = JSONRPCv1.response_message(self.result, self.msg_id)
+        else:
+            parts = [JSONRPCv1.response_message(item, msg_id)
+                     for item, msg_id in zip(self.result, self.msg_id)]
+            message = JSONRPCv1.batch_message_from_parts(parts)
+        return json.loads(message.decode())
+
+
+class HTMLResponse(ResponseBase):
+
+    def __init__(self, text, reason, status):
+        super().__init__({'Content-Type': 'text/html; charset=ISO-8859-1'},
+                         status)
+        self._text = text
+        self.reason = reason
+
+    async def text(self):
+        return self._text
+
+
+class ClientSessionBase(object):
+
+    def __enter__(self):
+        self.prior_class = aiohttp.ClientSession
+        aiohttp.ClientSession = lambda: self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        aiohttp.ClientSession = self.prior_class
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_value, traceback):
+        pass
+
+
+class ClientSessionGood(ClientSessionBase):
+    '''Imitate aiohttp for testing purposes.'''
+
+    def __init__(self, *triples):
+        self.triples = triples  # each a (method, args, result)
+        self.count = 0
+        self.expected_url = urls[0]
+
+    def post(self, url, data=""):
+        assert url == self.expected_url
+        request, request_id = JSONRPCLoose.message_to_item(data.encode())
+        method, args, result = self.triples[self.count]
+        self.count += 1
+        if isinstance(request, Request):
+            assert request.method == method
+            assert request.args == args
+            return JSONResponse(result, request_id)
+        else:
+            assert isinstance(request, Batch)
+            for request, args in zip(request, args):
+                assert request.method == method
+                assert request.args == args
+            return JSONResponse(result, request_id)
+
+
+class ClientSessionBadAuth(ClientSessionBase):
+
+    def post(self, url, data=""):
+         return HTMLResponse('', 'Unauthorized', 401)
+
+
+class ClientSessionWorkQueueFull(ClientSessionGood):
+
+    def post(self, url, data=""):
+        self.post = super().post
+        return HTMLResponse('Work queue depth exceeded',
+                            'Internal server error', 500)
+
+
+class ClientSessionNoConnection(ClientSessionGood):
+
+    def __init__(self, *args):
+        self.args = args
+
+    async def __aenter__(self):
+        aiohttp.ClientSession = lambda: ClientSessionGood(*self.args)
+        raise aiohttp.ClientConnectionError
+
+
+class ClientSessionPostError(ClientSessionGood):
+
+    def __init__(self, exception, *args):
+        self.exception = exception
+        self.args = args
+
+    def post(self, url, data=""):
+        aiohttp.ClientSession = lambda: ClientSessionGood(*self.args)
+        raise self.exception
+
+
+class ClientSessionFailover(ClientSessionGood):
+
+    def post(self, url, data=""):
+        # If not failed over; simulate disconnecting
+        if url == self.expected_url:
+            raise aiohttp.ServerDisconnectedError
+        else:
+            self.expected_url = urls[1]
+            return super().post(url, data)
+
+
+def in_caplog(caplog, message, count=1):
+    return sum(message in record.message
+               for record in caplog.records) == count
+
+#
+# Tests
+#
+
+def test_set_urls_bad():
+    with pytest.raises(CoinError):
+        Daemon(coin, '')
+    with pytest.raises(CoinError):
+        Daemon(coin, 'a')
+
+
+def test_set_urls_one(caplog):
+    with caplog.at_level(logging.INFO):
+        daemon = Daemon(coin, urls[0])
+    assert daemon.current_url() == urls[0]
+    assert len(daemon.urls) == 1
+    logged_url = daemon.logged_url()
+    assert logged_url == '127.0.0.1:8332/'
+    assert in_caplog(caplog, f'daemon #1 at {logged_url} (current)')
+
+
+def test_set_urls_two(caplog):
+    with caplog.at_level(logging.INFO):
+        daemon = Daemon(coin, ','.join(urls))
+    assert daemon.current_url() == urls[0]
+    assert len(daemon.urls) == 2
+    logged_url = daemon.logged_url()
+    assert logged_url == '127.0.0.1:8332/'
+    assert in_caplog(caplog, f'daemon #1 at {logged_url} (current)')
+    assert in_caplog(caplog, 'daemon #2 at 192.168.0.1:8332')
+
+
+def test_set_urls_short():
+    no_prefix_urls = ['/'.join(part for part in url.split('/')[2:])
+                      for url in urls]
+    daemon = Daemon(coin, ','.join(no_prefix_urls))
+    assert daemon.current_url() == urls[0]
+    assert len(daemon.urls) == 2
+
+    no_slash_urls = [url[:-1] for url in urls]
+    daemon = Daemon(coin, ','.join(no_slash_urls))
+    assert daemon.current_url() == urls[0]
+    assert len(daemon.urls) == 2
+
+    no_port_urls = [url[:url.rfind(':')] for url in urls]
+    daemon = Daemon(coin, ','.join(no_port_urls))
+    assert daemon.current_url() == urls[0]
+    assert len(daemon.urls) == 2
+
+
+def test_failover_good(caplog):
+    daemon = Daemon(coin, ','.join(urls))
+    with caplog.at_level(logging.INFO):
+        result = daemon.failover()
+    assert result is True
+    assert daemon.current_url() == urls[1]
+    logged_url = daemon.logged_url()
+    assert in_caplog(caplog, f'failing over to {logged_url}')
+    # And again
+    result = daemon.failover()
+    assert result is True
+    assert daemon.current_url() == urls[0]
+
+
+def test_failover_fail(caplog):
+    daemon = Daemon(coin, urls[0])
+    with caplog.at_level(logging.INFO):
+        result = daemon.failover()
+    assert result is False
+    assert daemon.current_url() == urls[0]
+    assert not in_caplog(caplog, f'failing over')
+
+
+@pytest.mark.asyncio
+async def test_height(daemon):
+    assert daemon.cached_height() is None
+    height = 300
+    with ClientSessionGood(('getblockcount', [], height)):
+        assert await daemon.height() == height
+    assert daemon.cached_height() == height
+
+
+@pytest.mark.asyncio
+async def test_broadcast_transaction(daemon):
+    raw_tx = 'deadbeef'
+    tx_hash = 'hash'
+    with ClientSessionGood(('sendrawtransaction', [raw_tx], tx_hash)):
+        assert await daemon.broadcast_transaction(raw_tx) == tx_hash
+
+
+@pytest.mark.asyncio
+async def test_relayfee(daemon):
+    response = {"relayfee": sats, "other:": "cruft"}
+    with ClientSessionGood(('getnetworkinfo', [], response)):
+        assert await daemon.getnetworkinfo() == response
+
+
+@pytest.mark.asyncio
+async def test_relayfee(daemon):
+    if isinstance(daemon, FakeEstimateFeeDaemon):
+        sats = daemon.coin.ESTIMATE_FEE
+    else:
+        sats = 2
+    response = {"relayfee": sats, "other:": "cruft"}
+    with ClientSessionGood(('getnetworkinfo', [], response)):
+        assert await daemon.relayfee() == sats
+
+
+@pytest.mark.asyncio
+async def test_mempool_hashes(daemon):
+    hashes = ['hex_hash1', 'hex_hash2']
+    with ClientSessionGood(('getrawmempool', [], hashes)):
+        assert await daemon.mempool_hashes() == hashes
+
+
+@pytest.mark.asyncio
+async def test_deserialised_block(daemon):
+    block_hash = 'block_hash'
+    result = {'some': 'mess'}
+    with ClientSessionGood(('getblock', [block_hash, True], result)):
+        assert await daemon.deserialised_block(block_hash) == result
+
+
+@pytest.mark.asyncio
+async def test_estimatefee(daemon):
+    method_not_found = RPCError(JSONRPCv1.METHOD_NOT_FOUND, 'nope')
+    if isinstance(daemon, FakeEstimateFeeDaemon):
+        result = daemon.coin.ESTIMATE_FEE
+    else:
+        result = -1
+    with ClientSessionGood(
+            ('estimatesmartfee', [], method_not_found),
+            ('estimatefee', [2], result)
+    ):
+        assert await daemon.estimatefee(2) == result
+
+
+@pytest.mark.asyncio
+async def test_estimatefee_smart(daemon):
+    bad_args = RPCError(JSONRPCv1.INVALID_ARGS, 'bad args')
+    if isinstance(daemon, FakeEstimateFeeDaemon):
+        return
+    rate = 0.0002
+    result = {'feerate': rate}
+    with ClientSessionGood(
+            ('estimatesmartfee', [], bad_args),
+            ('estimatesmartfee', [2], result)
+    ):
+        assert await daemon.estimatefee(2) == rate
+
+    # Test the rpc_available_cache is used
+    with ClientSessionGood(('estimatesmartfee', [2], result)):
+        assert await daemon.estimatefee(2) == rate
+
+
+@pytest.mark.asyncio
+async def test_getrawtransaction(daemon):
+    hex_hash = 'deadbeef'
+    simple = 'tx_in_hex'
+    verbose = {'hex': hex_hash, 'other': 'cruft'}
+    # Test False is converted to 0 - old daemon's reject False
+    with ClientSessionGood(('getrawtransaction', [hex_hash, 0], simple)):
+        assert await daemon.getrawtransaction(hex_hash) == simple
+
+    # Test True is converted to 1
+    with ClientSessionGood(('getrawtransaction', [hex_hash, 1], verbose)):
+        assert await daemon.getrawtransaction(
+            hex_hash, True) == verbose
+
+
+# Batch tests
+
+@pytest.mark.asyncio
+async def test_empty_send(daemon):
+    first = 5
+    count = 0
+    with ClientSessionGood(('getblockhash', [], [])):
+        assert await daemon.block_hex_hashes(first, count) == []
+
+
+@pytest.mark.asyncio
+async def test_block_hex_hashes(daemon):
+    first = 5
+    count = 3
+    hashes = [f'hex_hash{n}' for n in range(count)]
+    with ClientSessionGood(('getblockhash',
+                            [[n] for n in range(first, first + count)],
+                            hashes)):
+        assert await daemon.block_hex_hashes(first, count) == hashes
+
+
+@pytest.mark.asyncio
+async def test_raw_blocks(daemon):
+    count = 3
+    hex_hashes = [f'hex_hash{n}' for n in range(count)]
+    args_list = [[hex_hash, False] for hex_hash in hex_hashes]
+    iterable = (hex_hash for hex_hash in hex_hashes)
+    blocks = ["00", "019a", "02fe"]
+    blocks_raw = [bytes.fromhex(block) for block in blocks]
+    with ClientSessionGood(('getblock', args_list, blocks)):
+        assert await daemon.raw_blocks(iterable) == blocks_raw
+
+
+@pytest.mark.asyncio
+async def test_get_raw_transactions(daemon):
+    hex_hashes = ['deadbeef0', 'deadbeef1']
+    args_list = [[hex_hash, 0] for hex_hash in hex_hashes]
+    raw_txs_hex = ['fffefdfc', '0a0b0c0d']
+    raw_txs = [bytes.fromhex(raw_tx) for raw_tx in raw_txs_hex]
+    # Test 0 - old daemon's reject False
+    with ClientSessionGood(('getrawtransaction', args_list, raw_txs_hex)):
+        assert await daemon.getrawtransactions(hex_hashes) == raw_txs
+
+    # Test one error
+    tx_not_found = RPCError(-1, 'some error message')
+    results = ['ff0b7d', tx_not_found]
+    raw_txs = [bytes.fromhex(results[0]), None]
+    with ClientSessionGood(('getrawtransaction', args_list, results)):
+        assert await daemon.getrawtransactions(hex_hashes) == raw_txs
+
+
+# Other tests
+
+@pytest.mark.asyncio
+async def test_bad_auth(daemon, caplog):
+    with pytest.raises(DaemonError) as e:
+        with ClientSessionBadAuth():
+            await daemon.height()
+
+    assert "Unauthorized" in e.value.args[0]
+    assert in_caplog(caplog, "Unauthorized")
+
+
+@pytest.mark.asyncio
+async def test_workqueue_depth(daemon, caplog):
+    daemon.init_retry = 0.01
+    height = 125
+    with caplog.at_level(logging.INFO):
+        with ClientSessionWorkQueueFull(('getblockcount', [], height)):
+            await daemon.height() == height
+
+    assert in_caplog(caplog, "work queue full")
+    assert in_caplog(caplog, "running normally")
+
+
+@pytest.mark.asyncio
+async def test_connection_error(daemon, caplog):
+    height = 100
+    daemon.init_retry = 0.01
+    with caplog.at_level(logging.INFO):
+        with ClientSessionNoConnection(('getblockcount', [], height)):
+            await daemon.height() == height
+
+    assert in_caplog(caplog, "connection problem - is your daemon running?")
+    assert in_caplog(caplog, "connection restored")
+
+
+@pytest.mark.asyncio
+async def test_timeout_error(daemon, caplog):
+    height = 100
+    daemon.init_retry = 0.01
+    with caplog.at_level(logging.INFO):
+        with ClientSessionPostError(asyncio.TimeoutError,
+                                    ('getblockcount', [], height)):
+            await daemon.height() == height
+
+    assert in_caplog(caplog, "timeout error")
+
+
+@pytest.mark.asyncio
+async def test_disconnected(daemon, caplog):
+    height = 100
+    daemon.init_retry = 0.01
+    with caplog.at_level(logging.INFO):
+        with ClientSessionPostError(aiohttp.ServerDisconnectedError,
+                                    ('getblockcount', [], height)):
+            await daemon.height() == height
+
+    assert in_caplog(caplog, "disconnected")
+    assert in_caplog(caplog, "connection restored")
+
+
+@pytest.mark.asyncio
+async def test_warming_up(daemon, caplog):
+    warming_up = RPCError(-28, 'reading block index')
+    height = 100
+    daemon.init_retry = 0.01
+    with caplog.at_level(logging.INFO):
+        with ClientSessionGood(
+                ('getblockcount', [], warming_up),
+                ('getblockcount', [], height)
+        ):
+            assert await daemon.height() == height
+
+    assert in_caplog(caplog, "starting up checking blocks")
+    assert in_caplog(caplog, "running normally")
+
+
+@pytest.mark.asyncio
+async def test_warming_up_batch(daemon, caplog):
+    warming_up = RPCError(-28, 'reading block index')
+    first = 5
+    count = 1
+    daemon.init_retry = 0.01
+    hashes = ['hex_hash5']
+    with caplog.at_level(logging.INFO):
+        with ClientSessionGood(('getblockhash', [[first]], [warming_up]),
+                               ('getblockhash', [[first]], hashes)):
+            assert await daemon.block_hex_hashes(first, count) == hashes
+
+    assert in_caplog(caplog, "starting up checking blocks")
+    assert in_caplog(caplog, "running normally")
+
+
+@pytest.mark.asyncio
+async def test_failover(daemon, caplog):
+    height = 100
+    daemon.init_retry = 0.01
+    daemon.max_retry = 0.04
+    with caplog.at_level(logging.INFO):
+        with ClientSessionFailover(('getblockcount', [], height)):
+            await daemon.height() == height
+
+    assert in_caplog(caplog, "disconnected", 3)
+    assert in_caplog(caplog, "failing over")
+    assert in_caplog(caplog, "connection restored")