ci: separate workflow for very old matlab

Author: scivision

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04, windows-2022]
-        release: [R2021a, R2021b, R2022a, R2022b, R2023a, R2023b, R2024a, R2024b, R2025a]
+        release: [R2022a, R2022b, R2023a, R2023b, R2024a, R2024b, R2025a]
 # on Linux, even R2025a needs GCC 10.x and hence Github Actions runner ubuntu-22.04.
 # R2021a...R2022a officially need Ubuntu 20.04,
 # which is no longer available on Github Actions
@@ -76,3 +76,26 @@ jobs:
     - name: MEX tests
       if: ${{ matrix.release >= 'R2023b' }}
       uses: ./.github/workflows/composite-mex
+
+
+  matlab-older-than-R2022a:
+    timeout-minutes: 15
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-22.04]
+        release: [R2021a, R2021b]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - uses: ./.github/workflows/composite-install-matlab
+
+    - name: Matlab tell External Language Interface versions
+      uses: matlab-actions/run-command@v2
+      with:
+        command: stdlib.platform_tell()
+
+    - name: Non-MEX tests
+      uses: ./.github/workflows/composite-nomex

test/is_capable.m

@@ -26,16 +26,11 @@ function is_capable(tc, f)
     tc.assumeGreaterThanOrEqual(japi, 11)
   end
 
-elseif ~isMATLABReleaseOlderThan('R2022a') && contains(n, "python")
+elseif contains(n, "python")
 
    tc.assumeTrue(stdlib.has_python())
 
-   try 
-     py.psutil.version_info();
-     has_psutil = true;
-   catch
-     has_psutil = false;
-   end
+   has_psutil = pvt_psutil();
 
    if contains(n, ["ram_free", "ram_total"])
      tc.assumeTrue(has_psutil, "need Python psutil package")

test/private/pvt_psutil.m

@@ -0,0 +1,10 @@
+function y = pvt_psutil()
+
+try 
+ py.psutil.version_info();
+ y = true;
+catch
+ y = false;
+end
+
+end