Run Tests

Linting is just having tools look for common mistakes and reporting if they find any.

Whereas we automatically format our code to avoid fights, we lint our code to make sure that needed fights are had.

• Collapse your :dev and :nREPL aliases into one.

  There would be many similarities between :dev, :nREPL, and a hypothetical :test alias. Because we aren't relying on :main-opts there isn't much downside to just using one :dev alias.

  {:paths ["src"]
   :deps {org.clojure/clojure {:mvn/version "1.12.0"}
          ring/ring {:mvn/version "1.13.0"}
          metosin/reitit-ring {:mvn/version "0.5.5"}
          org.clojure/tools.logging {:mvn/version "1.3.0"}
          org.slf4j/slf4j-simple {:mvn/version "2.0.16"}
          hiccup/hiccup {:mvn/version "2.0.0-RC3"}}
   :aliases {:dev {:extra-paths ["dev"]
                   :extra-deps {nrepl/nrepl {:mvn/version "1.2.0"}}}
             :format {:deps {dev.weavejester/cljfmt {:mvn/version "0.13.0"}}}
             :lint   {:deps {clj-kondo/clj-kondo {:mvn/version "2024.09.27"}}}}}

  This does mean you will need to update how just nrepl functions slightly.

  help:
      just --list
  
  run:
      clojure -M -m example.main
  
  nrepl:
      clojure -M:dev -m nrepl.cmdline
  
  ...

• Add kaocha and a new test folder to your :dev alias

  Kaocha is a test runner. It runs your tests. The test folder is to have a place to write those tests.

  {:paths ["src"]
   :deps {org.clojure/clojure {:mvn/version "1.12.0"}
          ring/ring {:mvn/version "1.13.0"}
          metosin/reitit-ring {:mvn/version "0.5.5"}
          org.clojure/tools.logging {:mvn/version "1.3.0"}
          org.slf4j/slf4j-simple {:mvn/version "2.0.16"}
          hiccup/hiccup {:mvn/version "2.0.0-RC3"}}
   :aliases {:dev {:extra-paths ["dev" "test"]
                   :extra-deps {nrepl/nrepl {:mvn/version "1.2.0"}
                                lambdaisland/kaocha {:mvn/version "1.91.1392"}}}
             :format {:deps {dev.weavejester/cljfmt {:mvn/version "0.13.0"}}}
             :lint   {:deps {clj-kondo/clj-kondo {:mvn/version "2024.09.27"}}}}}

• Put the following in test/example/math_test.clj

  (ns example.math-test
    (:require [clojure.test :as t]))
  
  (t/deftest one-plus-one
    (t/is (= (+ 1 1) 3) "One plus one equals 3!"))

• Add a test recipe to your Justfile

  help:
      just --list
  
  run:
      clojure -M -m example.main
  
  nrepl:
      clojure -M:dev -m nrepl.cmdline
  
  format_check:
      clojure -M:format -m cljfmt.main check src dev
  
  format:
      clojure -M:format -m cljfmt.main fix src dev
  
  lint:
      clojure -M:lint -m clj-kondo.main --lint .
  
  test:
      clojure -M:dev -m kaocha.runner

• Run just test

  Because 1 + 1 does not equal 3, you should see a test failure reported.

• Fix your tests and run just test again

  (ns example.math-test
    (:require [clojure.test :as t]))
  
  (t/deftest one-plus-one
    (t/is (= (+ 1 1) 2) "One plus one equals 2!"))

• Add test to the list of directories to automatically format.

  help:
      just --list
  
  run:
      clojure -M -m example.main
  
  nrepl:
      clojure -M:dev -m nrepl.cmdline
  
  format_check:
      clojure -M:format -m cljfmt.main check src dev test
  
  format:
      clojure -M:format -m cljfmt.main fix src dev test
  
  lint:
      clojure -M:lint -m clj-kondo.main --lint .
  
  test:
      clojure -M:dev -m kaocha.runner