Add test for ArchiveCommand.

ArchiveCommand.py

@@ -8,4 +8,4 @@ class ArchiveCommand(Command.Command):
     def execute(self):
         for todo in [t for t in self.todolist.todos() if t.is_completed()]:
             self.archive.add_todo(todo)
-            self.todolist.delete(self.todolist.number(todo))
+            self.todolist.delete(todo)

test/ArchiveCommandTest.py

+import ArchiveCommand
+import CommandTest
+import TestFacilities
+import TodoList
+
+class ArchiveCommandTest(CommandTest.CommandTest):
+    def test_archive(self):
+        todolist = TestFacilities.load_file_to_todolist("data/ArchiveCommandTest.txt")
+        archive = TodoList.TodoList([])
+
+        command = ArchiveCommand.ArchiveCommand(todolist, archive)
+        command.execute()
+
+        self.assertTrue(todolist.is_dirty())
+        self.assertTrue(archive.is_dirty())
+        self.assertEquals(str(todolist), "x Not complete\n(C) Active")
+        self.assertEquals(str(archive), "x 2014-10-19 Complete\nx 2014-10-20 Another one complete")
+

test/data/ArchiveCommandTest.txt

+x 2014-10-19 Complete
+x 2014-10-20 Another one complete
+x Not complete
+(C) Active