From 2b5c0bfd0546dbfcbaea37dbdaf18eaf02119422 Mon Sep 17 00:00:00 2001
From: Joshua Lampert <51029046+JoshuaLampert@users.noreply.github.com>
Date: Fri, 2 Feb 2024 11:46:17 +0100
Subject: [PATCH] Create Downgrade.yml (#50)

* create Downgrade.yml

* add compat bounds for stdlibs and remove unused TOML in Project.toml

* skip Libdl (stdlib)

* fix lower compat bounds
---
 .github/workflows/Downgrade.yml | 64 +++++++++++++++++++++++++++++++++
 Project.toml                    |  8 ++---
 test/Project.toml               |  2 +-
 3 files changed, 69 insertions(+), 5 deletions(-)
 create mode 100644 .github/workflows/Downgrade.yml

diff --git a/.github/workflows/Downgrade.yml b/.github/workflows/Downgrade.yml
new file mode 100644
index 0000000..0e33e99
--- /dev/null
+++ b/.github/workflows/Downgrade.yml
@@ -0,0 +1,64 @@
+name: Downgrade
+
+on:
+  pull_request:
+    paths-ignore:
+      - 'AUTHORS.md'
+      - 'CITATION.bib'
+      - 'CONTRIBUTING.md'
+      - 'LICENSE.md'
+      - 'NEWS.md'
+      - 'README.md'
+      - '.zenodo.json'
+      - '.github/workflows/CompatHelper.yml'
+      - '.github/workflows/Documenter.yml'
+      - '.github/workflows/Format-check.yml'
+      - '.github/workflows/TagBot.yml'
+      - '.github/workflows/SpellCheck.yml'
+      - 'docs/**'
+  workflow_dispatch:
+
+# Cancel redundant CI tests automatically
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  downgrade_test:
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
+    # We could also include the Julia version as in
+    # name: ${{ matrix.trixi_test }} - ${{ matrix.os }} - Julia ${{ matrix.version }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    # to be more specific. However, that requires us updating the required CI tests whenever we update Julia.
+    name: Downgrade ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.9'
+          # - '~1.9.0-0' # including development versions
+          # - 'nightly'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - run: julia -e 'using InteractiveUtils; versioninfo(verbose=true)'
+      - uses: julia-actions/cache@v1
+      - uses: cjdoris/julia-downgrade-compat-action@v1.0.7
+        with:
+          skip: Libdl,UUIDs
+      - uses: julia-actions/julia-buildpkg@v1
+        env:
+          PYTHON: ""
+      - name: Run tests without coverage
+        uses: julia-actions/julia-runtest@v1
+        with:
+          coverage: false
+        env:
+          PYTHON: ""
diff --git a/Project.toml b/Project.toml
index 7a02a27..2850abc 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,16 +10,16 @@ MPI = "da04e1cc-30fd-572f-bb4f-1f8673147195"
 MPIPreferences = "3da0fdf6-3ccc-4f1b-acd9-58baa6c99267"
 Preferences = "21216c6a-2e73-6563-6e65-726566657250"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
-TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 t8code_jll = "4ee9bed8-4011-53f7-90c2-22363c2f500d"
 
 [compat]
 CEnum = "0.4, 0.5"
+Libdl = "1"
 MPI = "0.20"
-MPIPreferences = "0.1"
-Preferences = "1"
+MPIPreferences = "0.1.3"
+Preferences = "1.2"
 Reexport = "0.2, 1.0"
-TOML = "1"
+UUIDs = "1"
 julia = "1.6"
 t8code_jll = "=1.6.1"
diff --git a/test/Project.toml b/test/Project.toml
index cabf463..dfc6694 100644
--- a/test/Project.toml
+++ b/test/Project.toml
@@ -1,9 +1,9 @@
 [deps]
 MPI = "da04e1cc-30fd-572f-bb4f-1f8673147195"
 MPIPreferences = "3da0fdf6-3ccc-4f1b-acd9-58baa6c99267"
-TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [compat]
 MPI = "0.20"
 MPIPreferences = "0.1"
+Test = "1"