Further split mix tests

Author: andrjohns

.github/workflows/main.yml

@@ -91,6 +91,8 @@ jobs:
           - { os: ubuntu-24.04-arm, group: 3 }
           - { os: windows-latest, group: 4 }
           - { os: ubuntu-24.04-arm, group: 4 }
+          - { os: windows-latest, group: 5 }
+          - { os: ubuntu-24.04-arm, group: 5 }
 
     steps:
     - uses: actions/checkout@v4
@@ -124,13 +126,14 @@ jobs:
       run: |
         $MixFunProbTests = Get-ChildItem -Path test\unit\math\mix\fun\*, test\unit\math\mix\prob\* -Include *.cpp | Resolve-Path -Relative
         $NumberTests = $MixFunProbTests.Length
-        $QuarterNumberTests = [math]::Floor($NumberTests / 4)
-
-        $MixFunProbTests1 = $MixFunProbTests[0..($QuarterNumberTests - 1)]
-        $MixFunProbTests2 = $MixFunProbTests[$QuarterNumberTests..(2 * $QuarterNumberTests - 1)]
-        $MixFunProbTests3 = $MixFunProbTests[(2 * $QuarterNumberTests)..(3 * $QuarterNumberTests - 1)]
-        $MixFunProbTests4 = $MixFunProbTests[(3 * $QuarterNumberTests)..($NumberTests - 1)]
-        $MixFunProbTestsArray = @($MixFunProbTests1, $MixFunProbTests2, $MixFunProbTests3, $MixFunProbTests4)
+        $FifthNumberTests = [math]::Floor($NumberTests / 5)
+
+        $MixFunProbTests1 = $MixFunProbTests[0..($FifthNumberTests - 1)]
+        $MixFunProbTests2 = $MixFunProbTests[$FifthNumberTests..(2 * $FifthNumberTests - 1)]
+        $MixFunProbTests3 = $MixFunProbTests[(2 * $FifthNumberTests)..(3 * $FifthNumberTests - 1)]
+        $MixFunProbTests4 = $MixFunProbTests[(3 * $FifthNumberTests)..(4 * $FifthNumberTests - 1)]
+        $MixFunProbTests5 = $MixFunProbTests[(4 * $FifthNumberTests)..($NumberTests - 1)]
+        $MixFunProbTestsArray = @($MixFunProbTests1, $MixFunProbTests2, $MixFunProbTests3, $MixFunProbTests4, $MixFunProbTests5)
 
         python runTests.py -j2 $MixFunProbTestsArray[(${{ matrix.config.group }} - 1)]