test/host: test for host services

Implement basic checks for the new host service scaffolding.

test/mod/test_host.py

@@ -0,0 +1,67 @@
+#!/usr/bin/python3
+
+#
+# Runtime Tests for Host Services
+#
+
+import sys
+from typing import Any
+
+import pytest
+
+from osbuild import host
+from osbuild.util.jsoncomm import FdSet
+
+
+class ServiceTest(host.Service):
+
+    def dispatch(self, method: str, args: Any, fds: FdSet):
+        ret, fds = None, None
+
+        if method == "exception":
+            raise ValueError("Remote Exception")
+        if method == "echo":
+            ret = args
+        elif method == "identify":
+            ret = self.id
+        else:
+            raise host.ProtocolError("unknown method:", method)
+
+        return ret, fds
+
+
+def test_basic():
+    with host.ServiceManager() as mgr:
+        for i in range(3):
+            client = mgr.start(str(i), __file__)
+
+            args = ["an", "argument"]
+            res = client.call("echo", args)
+
+            assert args == res
+
+            remote_id = client.call("identify")
+            assert remote_id == str(i)
+
+            with pytest.raises(ValueError, match=f"{str(i)}"):
+                _ = mgr.start(str(i), __file__)
+
+        for i in range(3):
+            client = mgr.services[str(i)]
+            client.stop()
+
+
+def test_exception():
+    with host.ServiceManager() as mgr:
+        client = mgr.start("exception", __file__)
+        with pytest.raises(host.RemoteError, match=r"Remote Exception"):
+            client.call("exception")
+
+
+def main():
+    service = ServiceTest.from_args(sys.argv[1:])
+    service.main()
+
+
+if __name__ == "__main__":
+    main()