tests: Add scripting capabilities to the verification process

Add scripting capabilities to the verification process so that the mock
daemon can send its own results without needing the client to prod it to
do that. This is incredibly useful when the client is single threaded
and blocking.

Note that there are barely any safeguards, so the scripting task is not
cancelled if an error occurs, or the VerifyStatus signals are sent out
of order.

tests/dbusmock/fprintd.py

@@ -19,6 +19,7 @@ __copyright__ = '(c) 2020 Red Hat Inc.'
 __license__ = 'LGPL 3+'
 
 import dbus
+import asyncio
 
 from dbusmock import MOCK_IFACE, mockobject
 
@@ -77,6 +78,7 @@ def load(mock, parameters):
     fprintd = mockobject.objects[MAIN_OBJ]
     mock.last_device_id = 0
     fprintd.fingers = {}
+    mock.loop = asyncio.new_event_loop()
 
 @dbus.service.method(MAIN_IFACE,
                      in_signature='', out_signature='ao')
@@ -142,6 +144,7 @@ def AddDevice(self, device_name, num_enroll_stages, scan_type):
     device.fingers = {}
     device.claimed_user = None
     device.action = None
+    device.verify_script = []
 
     return path
 
@@ -195,6 +198,14 @@ def can_verify_finger(device, finger_name):
         return True
     return False
 
+async def send_verify_script(device, script):
+    for [result, done, timeout] in device.verify_script:
+        await asyncio.sleep(timeout)
+        device.EmitSignal(DEVICE_IFACE, 'VerifyStatus', 'sb', [
+                            result,
+                            done
+                          ])
+
 @dbus.service.method(DEVICE_IFACE,
                      in_signature='s', out_signature='')
 def VerifyStart(device, finger_name):
@@ -226,6 +237,10 @@ def VerifyStart(device, finger_name):
                           finger_name
                       ])
 
+    if device.verify_script is not None and len(device.verify_script) > 0:
+        asyncio.run(send_verify_script(device, device.verify_script))
+
+
 @dbus.service.method(DEVICE_MOCK_IFACE,
                      in_signature='sb', out_signature='')
 def EmitVerifyStatus(device, result, done):
@@ -318,3 +333,17 @@ def SetEnrolledFingers(device, user, fingers):
 
     device.fingers[user] = fingers
 
+@dbus.service.method(DEVICE_MOCK_IFACE,
+                     in_signature='a(sbi)', out_signature='')
+def SetVerifyScript(device, script):
+    '''Convenience method to set the verification script.
+
+    After VerifyStart is called, signal results will be sent in order after
+    a certain timeout declared in seconds. The array contains each
+    'result' followed by the 'done' argument for VerifyStatus, and the
+    amount of time to wait before each signal is sent.
+
+    Returns nothing.
+    '''
+
+    device.verify_script = script