Using fluree.db.api in tests causes the test runner to never exit

[filipesilva]

I see this while using com/fluree.db@1.0.0-rc34 with fluree/ledger@1.0.0-beta19, and the https://github.com/cognitect-labs/test-runner test runner with a simple test:

(deftest repro
  (let [conn (fdb/connect "http://localhost:8090")]
    @(fdb/new-ledger conn ledger)
    (fdb/wait-for-ledger-ready conn ledger)
    @(fdb/transact conn ledger schema-tx)
    (run! #(->> %
                new-event
                vector
                (fdb/transact conn ledger)
                deref)
          (range 4))
    (is (seq (-> conn
                 (fdb/db ledger)
                 (fdb/query {:select ["*"]
                             :from   "event"})
                 deref)))
    (fdb/close conn)))

Running this test with the test runner will hang forever after the tests finish:

...
Ran 1 tests containing 1 assertions.
0 failures, 0 errors.

I created a repro in https://github.com/filipesilva/fluree-test-hang that you can use by following these steps:

git clone https://github.com/filipesilva/fluree-test-hang
cd fluree-test-hang
docker-compose up -d fluree
clojure -X:test

[bplatz]

This issue no longer exists - but feel free to reopen if it exists in a specific environment.