From 6dc7f0e30bc1d9333e88f1b5137f61e2c143c653 Mon Sep 17 00:00:00 2001
From: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Date: Mon, 7 Sep 2026 10:24:17 -0400
Subject: [PATCH] Adopt grouped-tests and add 32-bit Core lane

Move the version/OS matrix into test_groups.toml and opt into arch=x86.
---
 .github/workflows/CI.yml | 17 +----------------
 test/test_groups.toml    |  9 +++++++++
 2 files changed, 10 insertions(+), 16 deletions(-)
 create mode 100644 test/test_groups.toml

diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 96ac5e8..b27f08a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,20 +20,5 @@ concurrency:
 
 jobs:
   tests:
-    name: "Tests"
-    strategy:
-      fail-fast: false
-      matrix:
-        version:
-          - "1"
-          - "lts"
-          - "pre"
-        os:
-          - "ubuntu-latest"
-          - "macos-latest"
-          - "windows-latest"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
-    with:
-      julia-version: "${{ matrix.version }}"
-      os: "${{ matrix.os }}"
+    uses: "SciML/.github/.github/workflows/grouped-tests.yml@v1"
     secrets: "inherit"
diff --git a/test/test_groups.toml b/test/test_groups.toml
new file mode 100644
index 0000000..d061a21
--- /dev/null
+++ b/test/test_groups.toml
@@ -0,0 +1,9 @@
+[Core]
+versions = ["lts", "1", "pre"]
+os = ["ubuntu-latest", "macos-latest", "windows-latest"]
+
+["Core 32-bit"]
+group = "Core"
+versions = ["1"]
+os = ["ubuntu-latest"]
+arch = "x86"