Update tests

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mocha (source)	devDependencies	patch	6.2.0 -> 6.2.1
sinon (source)	devDependencies	minor	7.4.1 -> 7.5.0

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Release Notes

mochajs/mocha

v6.2.1

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sinonjs/sinon

v7.5.0

Compare Source

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• Add sinon.assert.calledOnceWithExactly
• Feature parity: support spying all methods on an object

v7.4.2

Compare Source

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• Restore sinon.createStubInstance() behaviour (#​2073)
• Fix Typo in migration 6 and updated migration docs for migration from… (#​2074)

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