The default options passed to clojure.test.check/quick-check
by defspec.

If true, completed tests report test-var, num-tests and seed. Failed tests
report shrunk results. Defaults to true.

If true, a verbose report of the property being tested, the
failing return value, and the arguments provoking that failure is emitted
prior to the start of the shrinking search.

Controls whether property trials should be reported via clojure.test/report.
Valid values include:

* false - no reporting of trials (default)
* a function - will be passed a clojure.test/report-style map containing
:clojure.test.check/property and :clojure.test.check/trial slots
* true - provides quickcheck-style trial reporting (dots) via
`trial-report-dots`

(Note that all reporting requires running `quick-check` within the scope of a
clojure.test run (via `test-ns`, `test-all-vars`, etc.))

Reporting functions offered by clojure.test.check include `trial-report-dots` and
`trial-report-periodic` (which prints more verbose trial progress information
every `*trial-report-period*` milliseconds).

Milliseconds between reports emitted by `trial-report-periodic`.

Default function passed as the :reporter-fn to clojure.test.check/quick-check.
Delegates to clojure.test/report.

Defines a new clojure.test test var that uses `quick-check` to verify the
property, running num-times trials by default.  You can call the function defined as `name`
with no arguments to trigger this test directly (i.e., without starting a
wider clojure.test run).  If called with arguments, the first argument is the number of
trials, optionally followed by keyword arguments as defined for `quick-check`.

Intended to be bound as the value of `*report-trials*`; will emit a single
dot every 1000 trials reported.

Intended to be bound as the value of `*report-trials*`; will emit a verbose
status every `*trial-report-period*` milliseconds, like this one:

Passing trial 3286 / 5000 for (your-test-var-name-here) (:)