Tests: add first pytest

tests/test_nvr.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+
+import os
+import time
+import signal
+import subprocess
+import nvr
+
+def test_open_and_write_file():
+    env = {'NVIM_LISTEN_ADDRESS': '/tmp/pytest_nvimsock'}
+    env.update(os.environ)
+
+    with subprocess.Popen(['nvim', '-nu', 'NORC', '--headless'], close_fds=True,
+                          env=env) as proc:
+        time.sleep(1)
+        argv = ['nvr', '-c', 'e /tmp/pytest_file | %d | exe "norm! iabc" | w']
+        nvr.main(argv=argv, env=env)
+        proc.send_signal(signal.SIGTERM)
+
+    with open('/tmp/pytest_file') as f:
+        assert 'abc\n' == f.read()