CI: Test MPIABI_jll

Author: eschnett

.github/workflows/UnitTests.yml

@@ -78,6 +78,55 @@ jobs:
       env:
         COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
 
+
+  test-mpiabi-jll:
+    timeout-minutes: 20
+    strategy:
+      matrix:
+        os:
+          - macos-15-intel
+          - ubuntu-latest
+        julia_version:
+          - "min"
+          - "1"
+          - "nightly"
+        julia_arch: [x64]
+
+      fail-fast: false
+    env:
+      JULIA_MPI_TEST_BINARY: MPIABI_jll
+      JULIA_MPI_TEST_ABI: MPIABI
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v6
+
+    - uses: julia-actions/setup-julia@v2
+      with:
+        arch: ${{ matrix.julia_arch }}
+        version: ${{ matrix.julia_version }}
+    - uses: julia-actions/cache@v2
+
+    - name: add MPIPreferences
+      shell: julia --color=yes --project=. {0}
+      run: |
+        using Pkg
+        Pkg.develop(path="lib/MPIPreferences")
+
+    - name: use OpenMPI_jll
+      shell: julia --color=yes --project=test {0}
+      run: |
+        using Pkg
+        Pkg.develop(path="lib/MPIPreferences")
+        using MPIPreferences
+        MPIPreferences.use_jll_binary("MPIABI_jll", export_prefs=true)
+        rm("test/Manifest.toml")
+
+    - uses: julia-actions/julia-runtest@v1
+
+
   test-openmpi-jll:
     timeout-minutes: 20
     strategy:
@@ -129,6 +178,7 @@ jobs:
 
     - uses: julia-actions/julia-runtest@v1
 
+
   test-system-brew:
     timeout-minutes: 20
     strategy:
@@ -241,6 +291,7 @@ jobs:
 
     - uses: julia-actions/julia-runtest@v1
 
+
   test-intel-linux:
     timeout-minutes: 20
     strategy: