How to write and run test with elm-lang 0.17

setup.md

Testing

Create project and install packages:

elm-package install -y elm-lang/core
elm-package install -y elm-community/elm-test

Run tests:

elm-make tests/Tests.elm --output testRunner.js && node testRunner.js

Tests.elm

import ElmTest exposing (..)
import String

tests : Test
tests =
    suite "A Test Suite"
        [
            test "Addition" (assertEqual (3 + 7) 10),
            test "String.left" (assertEqual "a" (String.left 1 "abcdefg")),
            test "This test should pass" (assert True)
        ]

main =
    runSuite tests