Fix test error for non-CUDA machines

Author: fgittins

test/cuda_tests.jl

@@ -46,28 +46,31 @@ end
 
 @testitem "Termination Conditions: Allocations" tags=[:cuda] begin
     using CUDA, NonlinearSolveBase, Test, LinearAlgebra
-    CUDA.allowscalar(false)
-    du = cu(rand(4))
-    u = cu(rand(4))
-    uprev = cu(rand(4))
-    TERMINATION_CONDITIONS = [
-        RelTerminationMode, AbsTerminationMode
-    ]
-    NORM_TERMINATION_CONDITIONS = [
-        AbsNormTerminationMode, RelNormTerminationMode, RelNormSafeTerminationMode,
-        AbsNormSafeTerminationMode, RelNormSafeBestTerminationMode, AbsNormSafeBestTerminationMode
-    ]
 
-    @testset begin
-        @testset "Mode: $(tcond)" for tcond in TERMINATION_CONDITIONS
-            @test_nowarn NonlinearSolveBase.check_convergence(
-                tcond(), du, u, uprev, 1e-3, 1e-3)
-        end
+    if CUDA.functional()
+        CUDA.allowscalar(false)
+        du = cu(rand(4))
+        u = cu(rand(4))
+        uprev = cu(rand(4))
+        TERMINATION_CONDITIONS = [
+            RelTerminationMode, AbsTerminationMode
+        ]
+        NORM_TERMINATION_CONDITIONS = [
+            AbsNormTerminationMode, RelNormTerminationMode, RelNormSafeTerminationMode,
+            AbsNormSafeTerminationMode, RelNormSafeBestTerminationMode, AbsNormSafeBestTerminationMode
+        ]
 
-        @testset "Mode: $(tcond)" for tcond in NORM_TERMINATION_CONDITIONS
-            for nfn in (Base.Fix1(maximum, abs), Base.Fix2(norm, 2), Base.Fix2(norm, Inf))
+        @testset begin
+            @testset "Mode: $(tcond)" for tcond in TERMINATION_CONDITIONS
                 @test_nowarn NonlinearSolveBase.check_convergence(
-                    tcond(nfn), du, u, uprev, 1e-3, 1e-3)
+                    tcond(), du, u, uprev, 1e-3, 1e-3)
+            end
+
+            @testset "Mode: $(tcond)" for tcond in NORM_TERMINATION_CONDITIONS
+                for nfn in (Base.Fix1(maximum, abs), Base.Fix2(norm, 2), Base.Fix2(norm, Inf))
+                    @test_nowarn NonlinearSolveBase.check_convergence(
+                        tcond(nfn), du, u, uprev, 1e-3, 1e-3)
+                end
             end
         end
     end