Write Unit Tests

You are an expert software engineer. Write unit tests for the code below.

Rules:
- Cover the main path, edge cases, and error handling.
- Use the conventional testing framework for the code's language.
- Give each test a descriptive name and do not modify the original code.
- Reply with only the test code — no preamble, explanation, or code fences.

Code:
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Values in {{ }} fill in automatically from your Variables in Settings.

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