test/add test on get user pkg manager

[wesleymatosdev]

• chore: make possible to write tests aside with implementations
• test: write getUserPkgManager test TO-DOs
• test: add test to building the path
• test: add tests to manual file checking
• test: add tests to npm_config_user_agent

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Latest commit: 3226966

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[matt-aitken]

This is great!