[tests] Added engine and module tests

Added those two unit tests together, as they are tightly linked together
anyhow.

tests/mocks.py

@@ -4,6 +4,8 @@ import mock
 import shlex
 import subprocess
 
+from bumblebee.output import Widget
+
 class MockPopen(object):
     def __init__(self, module):
         self._patch = mock.patch("{}.subprocess.Popen".format(module))
@@ -24,4 +26,64 @@ class MockPopen(object):
     def cleanup(self):
         self._patch.stop()
 
+class MockInput(object):
+    def __init__(self):
+        self._callbacks = {}
+    def start(self):
+        pass
+
+    def stop(self):
+        pass
+
+    def get_callback(self, uid):
+        return self._callbacks.get(uid, None)
+
+    def register_callback(self, obj, button, cmd):
+        if not obj:
+            return
+        self._callbacks[obj.id] = {
+            "button": button,
+            "command": cmd,
+        }
+
+class MockOutput(object):
+    def start(self):
+        pass
+
+    def stop(self):
+        pass
+
+    def draw(self, widget, engine, module):
+        engine.stop()
+
+    def begin(self):
+        pass
+
+    def flush(self):
+        pass
+
+    def end(self):
+        pass
+
+class MockEngine(object):
+    def __init__(self):
+        self.input = MockInput()
+
+class MockWidget(Widget):
+    def __init__(self, text):
+        super(MockWidget, self).__init__(text)
+        self._text = text
+        self.module = None
+        self.attr_state = ["state-default"]
+        self.id = "none"
+
+    def state(self):
+        return self.attr_state
+
+    def update(self, widgets):
+        pass
+
+    def full_text(self):
+        return self._text
+
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