CLC-922 Fixing bamboo build issues, there was no cache environment defined for TESTEXT

Thus, causing all the tests to fail after merging in Ray's fix for emptying out the cache between spec tests: (since https://bamboo.media.berkeley.edu/bamboo/browse/MYB-CLCMVPMASTER-151). Eventually we probably want to write some tests that will test the cache, thus I didn't want to initialize it with a null store.