[tests] Add generic module tests

These tests check that all widgets of all modules conform to some basic
principles, at least.

bumblebee/modules/dnf.py

@@ -53,9 +53,7 @@ class Module(bumblebee.engine.Module):
     def __init__(self, engine, config):
         widget = bumblebee.output.Widget(full_text=self.updates)
         super(Module, self).__init__(engine, config, widget)
-
         self._next_check = 0
-        widget
 
     def updates(self, widget):
         result = []

tests/test_modules.py

@@ -0,0 +1,51 @@
+# pylint: disable=C0103,C0111
+
+import mock
+import unittest
+import importlib
+
+import tests.mocks as mocks
+
+from bumblebee.engine import all_modules
+from bumblebee.output import Widget
+from bumblebee.config import Config
+
+class TestGenericModules(unittest.TestCase):
+    def setUp(self):
+        self.popen = mocks.MockPopen()
+        self.popen.mock.communicate.return_value = (str.encode("1"), "error")
+        self.popen.mock.returncode = 0
+
+        engine = mock.Mock()
+        engine.input = mock.Mock()
+        config = Config()
+        self.objects = {}
+        for mod in all_modules():
+            cls = importlib.import_module("bumblebee.modules.{}".format(mod["name"]))
+            self.objects[mod["name"]] = getattr(cls, "Module")(engine, {"config": config})
+            for widget in self.objects[mod["name"]].widgets():
+                self.assertEquals(widget.get("variable", None), None)
+
+    def tearDown(self):
+        self.popen.cleanup()
+
+    def test_widgets(self):
+        for mod in self.objects:
+            widgets = self.objects[mod].widgets()
+            for widget in widgets:
+                widget.link_module(self.objects[mod])
+                self.assertEquals(widget.module, mod)
+                self.assertTrue(isinstance(widget, Widget))
+                self.assertTrue(hasattr(widget, "full_text"))
+                widget.set("variable", "value")
+                self.assertEquals(widget.get("variable", None), "value")
+                self.assertTrue(isinstance(widget.full_text(), str) or isinstance(widget.full_text(), unicode))
+
+    def test_update(self):
+        for mod in self.objects:
+            widgets = self.objects[mod].widgets()
+            self.objects[mod].update(widgets)
+            self.test_widgets()
+            self.assertEquals(widgets, self.objects[mod].widgets())
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4