Add test for uvloop fix

tests/rpc/test_rpc_apiserver.py

@@ -23,8 +23,8 @@ from freqtrade.rpc.api_server import ApiServer
 from freqtrade.rpc.api_server.api_auth import create_token, get_user_from_token
 from freqtrade.rpc.api_server.uvicorn_threaded import UvicornServer
 from freqtrade.state import RunMode, State
-from tests.conftest import (create_mock_trades, get_patched_freqtradebot, log_has, log_has_re,
-                            patch_get_signal)
+from tests.conftest import (create_mock_trades, get_mock_coro, get_patched_freqtradebot, log_has,
+                            log_has_re, patch_get_signal)
 
 
 BASE_URI = "/api/v1"
@@ -230,7 +230,7 @@ def test_api__init__(default_conf, mocker):
     assert apiserver._config == default_conf
 
 
-def test_api_UvicornServer(default_conf, mocker):
+def test_api_UvicornServer(mocker):
     thread_mock = mocker.patch('freqtrade.rpc.api_server.uvicorn_threaded.threading.Thread')
     s = UvicornServer(uvicorn.Config(MagicMock(), port=8080, host='127.0.0.1'))
     assert thread_mock.call_count == 0
@@ -248,6 +248,38 @@ def test_api_UvicornServer(default_conf, mocker):
     assert s.should_exit is True
 
 
+def test_api_UvicornServer_run(mocker):
+    serve_mock = mocker.patch('freqtrade.rpc.api_server.uvicorn_threaded.UvicornServer.serve',
+                              get_mock_coro(None))
+    s = UvicornServer(uvicorn.Config(MagicMock(), port=8080, host='127.0.0.1'))
+    assert serve_mock.call_count == 0
+
+    s.install_signal_handlers()
+    # Original implementation starts a thread - make sure that's not the case
+    assert serve_mock.call_count == 0
+
+    # Fake started to avoid sleeping forever
+    s.started = True
+    s.run()
+    assert serve_mock.call_count == 1
+
+
+def test_api_UvicornServer_run_no_uvloop(mocker, import_fails):
+    serve_mock = mocker.patch('freqtrade.rpc.api_server.uvicorn_threaded.UvicornServer.serve',
+                              get_mock_coro(None))
+    s = UvicornServer(uvicorn.Config(MagicMock(), port=8080, host='127.0.0.1'))
+    assert serve_mock.call_count == 0
+
+    s.install_signal_handlers()
+    # Original implementation starts a thread - make sure that's not the case
+    assert serve_mock.call_count == 0
+
+    # Fake started to avoid sleeping forever
+    s.started = True
+    s.run()
+    assert serve_mock.call_count == 1
+
+
 def test_api_run(default_conf, mocker, caplog):
     default_conf.update({"api_server": {"enabled": True,
                                         "listen_ip_address": "127.0.0.1",