Increase code coverage

Change log:
* Increase code coverage for test_exchange.py
* Move Exchange Unit tests files tests/exchange/
* Move RPC Unit tests files tests/rpc/

freqtrade/tests/rpc/test_rpc.py

@@ -0,0 +1,57 @@
+# pragma pylint: disable=missing-docstring, too-many-arguments, too-many-ancestors, C0103
+from copy import deepcopy
+from unittest.mock import MagicMock
+
+from freqtrade.rpc import init, cleanup, send_msg
+
+
+def test_init_telegram_enabled(default_conf, mocker):
+    module_list = []
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', module_list)
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.init', MagicMock())
+
+    init(default_conf)
+
+    assert telegram_mock.call_count == 1
+    assert 'telegram' in module_list
+
+
+def test_init_telegram_disabled(default_conf, mocker):
+    module_list = []
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', module_list)
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.init', MagicMock())
+
+    conf = deepcopy(default_conf)
+    conf['telegram']['enabled'] = False
+    init(conf)
+
+    assert telegram_mock.call_count == 0
+    assert 'telegram' not in module_list
+
+
+def test_cleanup_telegram_enabled(mocker):
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', ['telegram'])
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.cleanup', MagicMock())
+    cleanup()
+    assert telegram_mock.call_count == 1
+
+
+def test_cleanup_telegram_disabled(mocker):
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', [])
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.cleanup', MagicMock())
+    cleanup()
+    assert telegram_mock.call_count == 0
+
+
+def test_send_msg_telegram_enabled(mocker):
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', ['telegram'])
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.send_msg', MagicMock())
+    send_msg('test')
+    assert telegram_mock.call_count == 1
+
+
+def test_send_msg_telegram_disabled(mocker):
+    mocker.patch('freqtrade.rpc.REGISTERED_MODULES', [])
+    telegram_mock = mocker.patch('freqtrade.rpc.telegram.send_msg', MagicMock())
+    send_msg('test')
+    assert telegram_mock.call_count == 0