In this section, we'll take a look at how to configure your ClojureScript application or library for testing. As usual, we'll start by creating a new project for us to play around with:
$ lein new figwheel testing
Unlike previous examples where we spent most of our time in the src directory, we'll play around in a test directory this time. Most JVM Clojure projects will have one already, but since the default Figwheel template doesn't include one, let's make one first (following the same convention used with source directories, that is, instead of src/$PROJECT_NAME, we'll create test/$PROJECT_NAME):
$ mkdir -p test/testing
We'll now want to make sure that Figwheel knows to watch the test directory for file modifications. To do that, we will edit the dev build in our project.clj project's :cljsbuild map so that its :source-paths vector includes both src and test. Your new dev build configuration should look like this:
{:id "dev"
:source-paths...