function assertStoreKeyValues(keys, db) {
  const assertStoreTx = db.createTransaction(['store']);
  assertStoreTx.objectStore('store').getAllKeys().addCallback((results) => {
    assertSameElements(keys, results);
  });
}
Assert the keys are as expected.
@param {!Array<string>} keys - The expected keys.
@param {!IndexedDb} db - The indexed db.