Update tests

[renovate[bot]]

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`](https://togithub.com/mochajs/mocha/compare/v6.2.0...v6.2.1) [Compare Source](https://togithub.com/mochajs/mocha/compare/v6.2.0...v6.2.1)

sinonjs/sinon

### [`v7.5.0`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​750--2019-09-23) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.4.2...7835301641cfecb619533be874ade6e903b49120) ================== - Add sinon.assert.calledOnceWithExactly - Feature parity: support _spying_ all methods on an object ### [`v7.4.2`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​742--2019-09-02) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.4.1...v7.4.2) ================== - Restore sinon.createStubInstance() behaviour ([#​2073](https://togithub.com/sinonjs/sinon/issues/2073)) - Fix Typo in migration 6 and updated migration docs for migration from… ([#​2074](https://togithub.com/sinonjs/sinon/issues/2074))

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