Add tests for using buildConfig

[matthewp]

Changes

• No code changes, just tests added

Testing

• Tests that adapters (or any integrations really) can change buildConfig.client and buildConfig.server to specify where files are put.

Docs

N/A, test only

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Latest commit: e4a7d56

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[matthewp]

Going to merge this as people are busy and these are just tests.