Please use FileSystem tools to finish the following task:

### Task Description

You are given a directory containing multiple text files. Some files have identical content and need to be organized. Your task is to identify all files with duplicate content and move them to a newly created 'duplicates' directory.

### Task Objectives

1. **Scan all text files** in the test directory to identify groups with identical content
2. **Create a 'duplicates' directory** in the test directory root
3. **Move all duplicate files** into the 'duplicates' directory
4. **Leave unique files** in their original location

### Expected Output

After completing the task, the directory structure should be:

- `duplicates/` directory containing all files with duplicate content
- Original directory containing only files with unique content
