Add server tests

tests/conftest.py

@@ -1,9 +1,19 @@
+import asyncio
+import logging
+import os
+import pprint
+from subprocess import PIPE, run
+from threading import Thread
+
 import pytest
+from pygls import features
+from pygls.server import LanguageServer
+
+from cmake_language_server.server import CMakeLanguageServer
 
 
 @pytest.fixture()
 def cmake_build(shared_datadir):
-    from subprocess import run, PIPE
     source = shared_datadir / 'cmake'
     build = source / 'build'
     build.mkdir()
@@ -13,11 +23,37 @@ def cmake_build(shared_datadir):
             stderr=PIPE,
             universal_newlines=True)
     if p.returncode != 0:
-        import logging
-        import os
-        import pprint
         logging.error('env:\n' + pprint.pformat(os.environ))
         logging.error('stdout:\n' + p.stdout)
         logging.error('stderr:\n' + p.stderr)
         raise RuntimeError("CMake failed")
     yield build
+
+
+@pytest.fixture()
+def client_server():
+    c2s_r, c2s_w = os.pipe()
+    s2c_r, s2c_w = os.pipe()
+
+    def start(ls: LanguageServer, fdr, fdw):
+        # TODO: better patch is needed
+        # disable `close()` to avoid error messages
+        close = ls.loop.close
+        ls.loop.close = lambda: None
+        ls.start_io(os.fdopen(fdr, 'rb'), os.fdopen(fdw, 'wb'))
+        ls.loop.close = close
+
+    server = CMakeLanguageServer(asyncio.new_event_loop())
+    server_thread = Thread(target=start, args=(server, c2s_r, s2c_w))
+    server_thread.start()
+
+    client = LanguageServer(asyncio.new_event_loop())
+    client_thread = Thread(target=start, args=(client, s2c_r, c2s_w))
+    client_thread.start()
+
+    yield client, server
+
+    client.send_notification(features.EXIT)
+    server.send_notification(features.EXIT)
+    server_thread.join()
+    client_thread.join()