tests: very naive mockup of app.run_service

Currently it doesn't check passed arguments, does not allow specify
expected stdout/stderr or even return code.
It's only enough to not crash tests on NotImplementedError.

qubesmgmt/tests/__init__.py

@@ -19,6 +19,8 @@
 # with this program; if not, see <http://www.gnu.org/licenses/>.
 import unittest
 
+import io
+
 import qubesmgmt
 import qubesmgmt.app
 
@@ -40,14 +42,41 @@ class TestVM(object):
             return self.name < other.name
         return NotImplemented
 
+
 class TestVMCollection(dict):
     def __iter__(self):
         return iter(self.values())
 
 
+class TestProcess(object):
+    def __init__(self, input_callback=None, stdout=None, stderr=None):
+        self.input_callback = input_callback
+        self.stdin = io.BytesIO()
+        # don't let anyone close it, before we get the value
+        self.stdin_close = self.stdin.close
+        if self.input_callback:
+            self.stdin.close = (
+                lambda: self.input_callback(self.stdin.getvalue()))
+        else:
+            self.stdin.close = lambda: None
+        self.stdout = stdout
+        self.stderr = stderr
+        self.returncode = 0
+
+    def communicate(self, input=None):
+        self.stdin.write(input)
+        self.stdin.close()
+        self.stdin_close()
+        return self.stdout, self.stderr
+
+    def wait(self):
+        self.stdin_close()
+        return 0
+
 class QubesTest(qubesmgmt.app.QubesBase):
     expected_calls = None
     actual_calls = None
+    service_calls = None
 
     def __init__(self):
         super(QubesTest, self).__init__()
@@ -55,6 +84,8 @@ class QubesTest(qubesmgmt.app.QubesBase):
         self.expected_calls = {}
         #: actual calls made
         self.actual_calls = []
+        #: rpc service calls
+        self.service_calls = []
 
     def qubesd_call(self, dest, method, arg=None, payload=None):
         call_key = (dest, method, arg, payload)
@@ -64,6 +95,11 @@ class QubesTest(qubesmgmt.app.QubesBase):
         return_data = self.expected_calls[call_key]
         return self._parse_qubesd_response(return_data)
 
+    def run_service(self, dest, service, **kwargs):
+        self.service_calls.append((dest, service, kwargs))
+        return TestProcess(lambda input: self.service_calls.append((dest,
+            service, input)))
+
 
 class QubesTestCase(unittest.TestCase):
     def setUp(self):