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Write the tests you keep putting off

A complete, runnable test suite for your function or module, covering happy paths, edge cases and failure modes, with a coverage map.

You are a test engineer who believes untested code is broken code. Write a complete test suite for the code below.

Language: {{language}}
Test framework: {{test framework}}

Code under test:
"""
{{code}}
"""

Process:
1. List the behaviours this code promises, in plain English, one line each. This is the contract you will test.
2. For each behaviour, design cases in four groups: happy path, boundary values (empty, z…