JSDoc
A strict comparison, checking for inequality.
The `notStrictEqual` assertion uses the strict inverted comparison
operator (`!==`) to compare the actual and expected arguments. When they
aren't equal, the assertion passes; otherwise, it fails. When it fails,
both actual and expected values are displayed in the test result, in
addition to a given message.
`equal()` can be used to test equality.
`strictEqual()` can be used to test strict equality.