test: Make sure closing stdin gets propagated to host apps

This only works when we don't accidentally keep any fd open in the
proxy.

Author: swick

tests/native-messaging-hosts/org.example.writeonclose.json

@@ -0,0 +1,9 @@
+{
+  "name": "org.example.writeonclose",
+  "description": "Writes a file to $TMPDIR/xnmp-write-on-close when stdin gets closed",
+  "path": "write-on-close.py",
+  "type": "stdio",
+  "allowed_extensions": [
+    "[email protected]"
+  ]
+}

tests/native-messaging-hosts/write-on-close.py

@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+import sys
+import os
+from pathlib import Path
+
+while True:
+    r = sys.stdin.buffer.read(1)
+    if len(r) == 0:
+        break
+
+(Path(os.environ["TMPDIR"]) / "xnmp-write-on-close").touch()

tests/test_xnmp.py

@@ -2,6 +2,7 @@
 import json
 import xnmp
 import errno
+from pathlib import Path
 
 
 class TestXnmp:
@@ -117,3 +118,21 @@ def fd_closed():
             xnmp.wait_for(fd_closed)
         finally:
             os.close(stdin_fd)
+
+    def test_close_stdin(self, xdg_native_messaging_proxy, manifests, dbus_con):
+        iface = xnmp.get_iface(dbus_con)
+        manifest_name = "org.example.writeonclose"
+        extension = "[email protected]"
+        mode = "firefox"
+
+        (stdin, stdout, stderr, handle) = iface.Start(
+            manifest_name, extension, mode, {}
+        )
+
+        fpath = Path(os.environ["TMPDIR"]) / "xnmp-write-on-close"
+        assert not fpath.exists()
+
+        stdin_fd = stdin.take()
+
+        os.close(stdin_fd)
+        xnmp.wait_for(lambda: fpath.exists())