Add test for TodoFile.

test/TestFacilities.py

+import Todo
+import TodoFile
+
+def load_file(p_filename):
+    """
+    Loads a todo file from the given filename and returns a list of todos.
+    """
+    todofile = TodoFile.TodoFile(p_filename)
+    return [Todo.Todo(src) for src in todofile.read()]
+

test/TodoFileTest.py

+import unittest
+
+from TestFacilities import load_file
+
+class TodoFileTest(unittest.TestCase):
+    def test_empty_file(self):
+        todofile = load_file('TodoFileTest1.txt')
+
+        self.assertEquals(len(todofile), 0)