> caches.open("blog - 2016-06-10 14:14:23 -0700").then(c => c.keys()) > Promise { <state>: "pending" }
Note that this test will *not* tell you whether or not c.keys() returns a promise; the .then callback is allowed to return a non-promise, and .then() always returns a promise regardless. You have to log the return value of c.keys() directly. ~TJ