Can't run a single test with bb test --only

[jmglov]

I should be able to run a single test using --only, like so:

bb test --only quickblog.api-test/migrate

However, bb test ignores the --only arg and happily runs all the tests, thus making me sad:

$ bb test --only quickblog.api-test/migrate

Running tests in #{"test"}

Testing quickblog.api-test

Ran 5 tests containing 138 assertions.
0 failures, 0 errors.

I would expect a single test with 1 assertion to run, given quickblog.api-test/migrate:

(deftest migrate
  (with-dirs [posts-dir]
    (let [posts-edn (write-test-file posts-dir "posts.edn"
                                     {:file "test.md"
                                      :title "Test post"
                                      :date "2022-01-02"
                                      :tags #{"clojure"}})
          post-file (write-test-file posts-dir "test.md"
                                     "Write a blog post here!")
          to-lines #(-> % str/split-lines set)]
      (api/migrate {:posts-dir posts-dir
                    :posts-file posts-edn})
      (is (= (to-lines "Title: Test post\nDate: 2022-01-02\nTags: clojure\n\nWrite a blog post here!")
             (to-lines (slurp post-file)))))))