test: integration test for mneme.install in an empty project

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ on:
       - '**'
 jobs:
   lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       MIX_ENV: dev
     strategy:
@@ -15,7 +15,7 @@ jobs:
         elixir: [1.17]
         otp: [27]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Elixir
         id: beam
@@ -64,7 +64,7 @@ jobs:
         run: MIX_ENV=dev mix dialyzer --format github
 
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       MIX_ENV: test
     strategy:
@@ -82,7 +82,7 @@ jobs:
           - elixir: 1.16
             otp: 27
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: awalsh128/cache-apt-pkgs-action@latest
         with:
@@ -109,3 +109,21 @@ jobs:
       - run: mix test
 
       - run: mix test.mneme_not_started
+
+  integration-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: inotify-tools
+          version: 1.0
+
+      - name: Set up Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          elixir-version: 1.17.3
+          otp-version: 27.1.2
+
+      - run: bin/integration-test-mneme-install.sh

bin/integration-test-mneme-install.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# exit if a variable is undefined, a command files, or a command in a pipeline fails
+set -ueo pipefail
+
+# ensure mix igniter.new is available
+mix help | grep "mix igniter.new" >/dev/null || mix archive.install hex igniter_new --force
+
+mkdir -p tmp
+cd tmp
+rm -rf test_mneme_install
+
+mix igniter.new test_mneme_install --install mneme@path:../.. --yes
+
+cd test_mneme_install
+
+cat <<EOF >test_mneme_install_test.exs
+defmodule TestMnemeInstallTest do
+  use ExUnit.Case
+  use Mneme
+
+  test "succeeds if Mneme was installed properly" do
+    auto_assert 1 <- 1
+  end
+end
+EOF
+
+mix mneme.watch --exit-on-success
+exit $?