improve spread test, implement proper dbus activatable test app

debian/snapd.install

@@ -3,4 +3,4 @@ usr/bin/snap-exec /usr/lib/snapd/
 usr/bin/snapctl
 usr/bin/snapd /usr/lib/snapd/
 
-data/dbus/snapd.conf etc/dbus-1/session.d
+data/dbus/snapd.conf etc/dbus-1/session.d

tests/lib/snaps/test-snapd-dbus-service/bin/test-snapd-dbus-service

@@ -0,0 +1,24 @@
+#!/usr/bin/python3
+
+from gi.repository import GLib
+
+import dbus
+import dbus.service
+from dbus.mainloop.glib import DBusGMainLoop
+DBusGMainLoop(set_as_default=True)
+
+
+class ServerObject(dbus.service.Object):
+    def __init__(self):
+        bus_name = dbus.service.BusName(
+            'io.snapcraft.SnapDbusService',bus=dbus.SessionBus())
+        dbus.service.Object.__init__(self, bus_name, '/')
+    @dbus.service.method('io.snapcraft.ExampleInterface')
+    def ExampleMethod(self):
+	    return "hello world"
+
+
+if __name__ == "__main__":
+    server = ServerObject()
+    loop = GLib.MainLoop()
+    loop.run()

tests/lib/snaps/test-snapd-dbus-service/meta/gui/test-snapd-dbus.service

@@ -0,0 +1,3 @@
+[D-BUS Service]
+Name=io.snapcraft.SnapDbusService
+Exec=test-snapd-dbus-service

tests/lib/snaps/test-snapd-dbus-service/snapcraft.yaml

@@ -0,0 +1,20 @@
+name: test-snapd-dbus-service
+version: 1.0
+summary: Python based example dbus service
+description: ...
+apps:
+  test-snapd-dbus-service:
+    # FIXME: set GI_TYPELIB_PATH=$SNAP/usr/lib/x86_64-linux-gnu/girepository-1.0
+    # FIXME2: confinement issues, this only works with devmode right now
+    command: bin/test-snapd-dbus-service
+    plugs: [network, network-bind]
+parts:
+  test-snapd-dbus-service:
+    plugin: python3
+    stage-packages:
+      - python3-dbus
+      - python3-gi
+      - gir1.2-glib-2.0
+  copy:
+    plugin: dump
+    source: .

tests/main/dbus-activated/task.yaml

@@ -0,0 +1,12 @@
+summary: Test dbus activated snaps
+
+execute: |
+    echo "Ensure we have a snap that is dbus service activated"
+    snap install test-snapd-dbus-service
+    if ps afx|grep test-snapd-dbus-service; then
+        echo "test-snapd-dbus-service already running! test broken"
+        exit 1
+    fi
+
+    echo "Then sending methods to it will wake it up"
+    dbus-send --print-reply --dest=io.snapcraft.SnapDbusService  / io.snapcraft.ExampleInterface.ExampleMethod | MATCH hello