QA:Testcase ack search

Description

This test case tests whether you can search using ack.

Setup

1. Ensure the ack package is installed

How to test

1. Run ack "search_string" to search for the "search_str" recursively in the current directory
2. Run ack --type=python "search_string" to search for the "search_string" recursively in the current directory inside files with extension .py

Expected Results

1. The search results should show up as expected