add unit test for passing a preconfigured client #4
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This adds a unit test for the same kind of behavior mentioned in launchdarkly/php-server-sdk#151; even though that PR is for the phpredis integration, not the Predis one, both have a similar "use an existing client" option. We've already added an equivalent test in PHP SDK 3.x where the database integrations are still in the main SDK package, so this is the version for the separate package for use with PHP SDK 4.x.