Require Elixir 1.12+ #51

	name: CI

	on:
	pull_request:
	push:
	branches:
	- main

	jobs:
	test:
	name: Test (Elixir ${{ matrix.elixir }}, OTP ${{ matrix.erlang }})
	runs-on: ubuntu-22.04
	strategy:
	fail-fast: false
	matrix:
	include:
	- erlang: "27.0"
	elixir: "1.17"
	lint: true
	coverage: true
	- erlang: "23.3"
	elixir: "1.12"

	env:
	MIX_ENV: test
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

	steps:
	- uses: actions/checkout@v4

	- name: Install Erlang and Elixir
	uses: erlef/setup-beam@v1
	with:
	otp-version: ${{ matrix.erlang }}
	elixir-version: ${{ matrix.elixir }}

	- name: Install dependencies
	run: mix deps.get --only test

	# Don't cache PLTs based on mix.lock hash, as Dialyzer can incrementally update even old ones
	# Cache key based on Elixir & Erlang version (also useful when running in matrix)
	- name: Cache Dialyzer's PLT
	uses: actions/cache@v4
	id: cache-plt
	with:
	path: priv/plts
	key: ${{ runner.os }}-otp${{ matrix.erlang }}-elixir${{ matrix.elixir }}

	# Create PLTs if no cache was found
	- name: Create PLTs
	if: steps.cache-plt.outputs.cache-hit != 'true'
	run: mix do deps.get, dialyzer --plt

	- name: Check formatting
	run: mix format --check-formatted
	if: ${{ matrix.lint }}

	- name: Check for unused dependencies
	run: mix do deps.get, deps.unlock --check-unused
	if: ${{ matrix.lint }}

	- name: Compile with --warnings-as-errors
	run: mix compile --warnings-as-errors
	if: ${{ matrix.lint }}

	- name: Run tests
	run: mix test --trace
	if: ${{ !matrix.coverage }}

	- name: Run tests with coverage
	run: mix coveralls.github --trace
	if: ${{ matrix.coverage }}

	- name: Run Dialyzer
	run: mix dialyzer

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