tests: Initial Integration Tests

Heavily inspired by the already existing integration tests from Icinga
DB, the icinga-testing project was extended to support Icinga
Notifications[0].

Based on those changes, an initial integration test was implemented for
Icinga Notifications, currently just launching PostgreSQL, Icinga 2, and
Icinga Notifications, waiting for Icinga Notifications to scan the
available channels and write them into the database.

[0] Icinga/icinga-testing#25

.github/workflows/integration-tests.yml

@@ -0,0 +1,33 @@
+name: Integration Tests
+
+on:
+  push:
+    branches:
+      - main
+      - 'support/*'
+      - 'init-integration-tests'  # TODO: remove as this is the PR branch
+  pull_request: {}
+  schedule:
+    - cron: '42 23 * * *'
+
+jobs:
+  integration-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: stable
+      - name: Run Integration Tests
+        run: ./test.sh
+        working-directory: tests/
+      - name: Compress Debug Log
+        if: ${{ always() }}
+        run: xz -9 ./tests/tmp/debug.log
+      - name: Upload Debug Log
+        if: ${{ always() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: debug.log.xz
+          path: ./tests/tmp/debug.log.xz
+          retention-days: 1

tests/go.mod

@@ -0,0 +1,40 @@
+module github.com/icinga/icinga-notifications/tests
+
+go 1.21
+
+replace github.com/icinga/icinga-testing => github.com/oxzi/icinga-testing v0.0.0-20231220141937-686d5c9faef9
+
+require (
+	github.com/icinga/icinga-testing v0.0.0-20220516144008-9600081b7a69
+	github.com/jmoiron/sqlx v1.3.5
+	github.com/stretchr/testify v1.8.4
+)
+
+require (
+	github.com/Icinga/go-libs v0.0.0-20220420130327-ef58ad52edd8 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/distribution/reference v0.5.0 // indirect
+	github.com/docker/distribution v2.8.3+incompatible // indirect
+	github.com/docker/docker v24.0.7+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/go-redis/redis/v8 v8.11.5 // indirect
+	github.com/go-sql-driver/mysql v1.7.1 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/lib/pq v1.10.9 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.1.0-rc5 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.26.0 // indirect
+	golang.org/x/mod v0.14.0 // indirect
+	golang.org/x/net v0.19.0 // indirect
+	golang.org/x/sync v0.5.0 // indirect
+	golang.org/x/sys v0.15.0 // indirect
+	golang.org/x/tools v0.16.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)