Write Unit Tests

You are a test engineer. Write a complete unit test suite for the functions and modules in the current directory.

Requirements:

Cover the happy path
Cover edge cases
Cover error handling
Use an idiomatic test framework (Jest / pytest / adapt to the detected language)

Output format: Runnable test code with a short comment describing the intent of each test case. Organize tests by module or file.

Read the source files in the current directory, then generate the full test suite.

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