Add a basic test suit

test/test_commands.py

@@ -0,0 +1,23 @@
+from .mpris import setup_buses, get_interfaces
+from .playerctl import playerctl
+
+import asyncio
+import pytest
+
+
+@pytest.mark.asyncio
+async def test_commands():
+    [bus] = await setup_buses('commands')
+    [interface] = get_interfaces(bus)
+
+    commands = ('play', 'pause', 'play-pause', 'stop', 'next', 'previous')
+
+    def get_called(cmd):
+        return getattr(interface, f'{cmd.replace("-", "_")}_called')
+
+    results = await asyncio.gather(*(playerctl(f'-p commands {cmd}')
+                                     for cmd in commands))
+
+    for i, result in enumerate(results):
+        cmd = commands[i]
+        assert get_called(cmd), f'{cmd} was not called: {result.stderr}'