chore: Refactor test provider

[stevehipwell]

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Before the change?

• Tests used inconsistent provider configuration
• We imported stretchr/testify for a single test

After the change?

• Test use a consistent provider implementation
• We no longer depend on stretchr/testify

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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