Fix wrapper test failures by running them sequentially

.github/workflows/CI_NonlinearSolve.yml

@@ -78,6 +78,8 @@ jobs:
         shell: julia --color=yes --code-coverage=user --depwarn=yes --project=. {0}
         env:
           GROUP: ${{ matrix.group }}
+          # Wrapper tests run sequentially to avoid parallel initialization issues with external packages
+          RETESTITEMS_NWORKERS: ${{ matrix.group == 'wrappers' && '0' || '' }}
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: src,ext,lib/SciMLJacobianOperators/src,lib/BracketingNonlinearSolve/src,lib/NonlinearSolveBase/src,lib/NonlinearSolveBase/ext,lib/SimpleNonlinearSolve/src,lib/NonlinearSolveFirstOrder/src,lib/NonlinearSolveSpectralMethods/src,lib/NonlinearSolveQuasiNewton/src

test/runtests.jl

@@ -17,11 +17,16 @@ if GROUP == "all" || GROUP == "nopre"
 end
 length(EXTRA_PKGS) ≥ 1 && Pkg.add(EXTRA_PKGS)
 
-const RETESTITEMS_NWORKERS = parse(
-    Int, get(ENV, "RETESTITEMS_NWORKERS",
-        string(min(ifelse(Sys.iswindows(), 0, Hwloc.num_physical_cores()), 4))
+# Use sequential execution for wrapper tests to avoid parallel initialization issues
+const RETESTITEMS_NWORKERS = if GROUP == "wrappers"
+    0  # Sequential execution for wrapper tests
+else
+    parse(
+        Int, get(ENV, "RETESTITEMS_NWORKERS",
+            string(min(ifelse(Sys.iswindows(), 0, Hwloc.num_physical_cores()), 4))
+        )
     )
-)
+end
 const RETESTITEMS_NWORKER_THREADS = parse(Int,
     get(
         ENV, "RETESTITEMS_NWORKER_THREADS",

test/wrappers/rootfind_tests.jl

@@ -1,4 +1,4 @@
-@testitem "Steady State Problems" tags=[:wrappers] retries=3 begin
+@testitem "Steady State Problems" tags=[:wrappers] retries=5 begin
     import NLSolvers, NLsolve, SIAMFANLEquations, MINPACK, PETSc
 
     function f_iip(du, u, p, t)
@@ -43,7 +43,7 @@
     end
 end
 
-@testitem "Nonlinear Root Finding Problems" tags=[:wrappers] retries=3 begin
+@testitem "Nonlinear Root Finding Problems" tags=[:wrappers] retries=5 begin
     using LinearAlgebra
     import NLSolvers, NLsolve, SIAMFANLEquations, MINPACK, PETSc
 
@@ -163,7 +163,7 @@ end
     end
 end
 
-@testitem "PETSc SNES Floating Points" tags=[:wrappers] retries=3 skip=:(Sys.iswindows()) begin
+@testitem "PETSc SNES Floating Points" tags=[:wrappers] retries=5 skip=:(Sys.iswindows()) begin
     import PETSc
 
     f(u, p)=u .* u .- 2